JP2020074773A - Fertilization amount determination device and fertilization amount determination method - Google Patents

Abstract

To allow for determination of an appropriate fertilization amount by a new method in consideration of an influence of an element found to affect a state of a harvested product due to cultivation of an agricultural crop.SOLUTION: A fertilization amount determination device 1 acquires predicted temperature information which indicates a predicted temperature of a grain filling period or a growth period and information related to vegetation in topdressing time, and acquires information which is generated on the basis of a fertilization amount in actual previous fertilization amount, information related to vegetation in topdressing time, the temperature in the grain filling period or the growth period which arrives after the topdressing, and a state of crops harvested after the grain filling period or the growth period, the information is fertilization amount related information relates to a required fertilization amount in topdressing time for achieving a target state of the crops to be harvested, and determines the fertilization amount on the basis of each information, and reflects information related to vegetation in topdressing time and the predicted temperature in the grain filling period or the growth period, for determining the fertilization amount.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a fertilization amount determination device and a fertilization amount determination method for determining a fertilization amount for top-dressing a crop.

  In rice cultivation, top fertilization called ear fertilization is performed at a predetermined timing from the formation of panicles to the emergence of head. Conventionally, in order to improve the quality and yield of the harvest, this top fertilizer is applied appropriately at the time of top fertilization. Techniques for calculating and determining quantities have been proposed. For example, in Patent Document 1, the leaf color and the number of stems of rice (paddy rice) that are growing this season are measured, the amount of absorbed nitrogen is obtained from the leaf color and the number of stems, and the nitrogen application amount that has already been input is subtracted from the amount of absorbed nitrogen. A technique for obtaining the amount of soil nitrogen and obtaining the amount of nitrogen (fertilization) required for the next rice cultivation from the amount of soil nitrogen and the appropriate amount of nitrogen set in advance is described. Such a technique is not limited to rice cultivation, and is similarly proposed for other agricultural crops, for example, grains such as wheat, barley or soybean, vegetables and fruits.

Japanese Unexamined Patent Publication No. 2018-82648

  Factors that affect the quality of harvested rice (including not only appearance quality but also the quality of components such as protein content) and yield are factors disclosed in Patent Document 1 (already There are various other types of fertilizer application, etc.), and as a result of recent research, it affects the state of harvested rice (quality, yield, etc., but not limited to quality, yield). The element is newly discovered. For this reason, in the field of rice cultivation, when factors that affect the state of harvest are found, there is a need to be able to determine an appropriate fertilizer application amount by a new method that takes into consideration the influence of the factors. Such needs are not limited to rice cultivation, but are also applicable to the cultivation of agricultural crops other than rice, such as wheat, barley or soybeans, and vegetables and fruits.

  The present invention was made in order to solve such a problem, and an appropriate fertilization amount is applied by a new method in consideration of the influence of the elements found to affect the state of the harvest due to the cultivation of agricultural products. It is an object to provide a decidable fertilizer application rate determination device.

  In order to solve the above problems, in the present invention, while obtaining the information about the vegetation of the crop, and the expected temperature of the ripening period or the growing season of the crop, the amount of fertilizer applied during the actual actual topdressing in the past, at the time of topdressing The temperature at the ripening or growing season, which is generated based on the information about vegetation, the temperature at the ripening or growing season after the fertilization, and the condition of the crops harvested after the ripening, is the predetermined temperature. Acquire fertilization rate related information regarding the fertilization rate required at the time of additional fertilization in order to set the state of the agricultural product to the target state when it is expected, and determine the fertilization rate at the time of additional fertilization based on each acquired information. There is. The present invention also provides a method for determining the amount of fertilizer applied based on information about vegetation at the time of top fertilization based on image data for analysis of agricultural products and the expected temperature during the ripening period or growing period of the agricultural products.

  The crops of the present invention means rice, wheat, barley, soybeans, and other grains, vegetables, fruits, and the like, but is not limited thereto, and is used as a meaning that includes all human-controlled plants. .. For example, the plant that constitutes a forest or grassland is included in the present invention when it is managed by a person. Regarding the "ripening period" and the "growing period" in the present invention, the former means a time corresponding to rice and wheat, and the latter means a time corresponding to all agricultural crops. That is, the rice and wheat are the periods corresponding to the "ripening period" and the "growing period", but in the case of other agricultural products, the "growing period" is the corresponding period.

  Here, as a result of the research, the inventors have found that the amount of fertilizer applied during topdressing, information on vegetation during topdressing, and the temperature during the ripening period after topdressing affect the state of the harvested product. It was found that it is possible to improve the condition of the harvested crops by adjusting the fertilizer application rate according to the combination of the information about vegetation and the expected temperature during the ripening period. Then, according to the present invention configured as described above, reflecting the relationship between the past actual fertilizer application amount, information about vegetation and the temperature during the ripening period, the state of the harvested agricultural crops is reflected. It is possible to appropriately determine the amount of fertilizer applied to achieve the target state according to the combination of the information on vegetation during topdressing and the expected temperature during the ripening period. That is, according to the present invention, it is a new method in consideration of the amount of fertilizer applied during topdressing, information about vegetation during topdressing, and the factors found to affect the state of the harvest such as the temperature during the ripening period after topdressing. It is possible to determine an appropriate fertilization amount.

It is a block diagram showing an example of functional composition of a fertilizer application determination device concerning one embodiment of the present invention. It is a figure which shows the relationship between the average value of the daily average temperature in the first half of the ripening period, and the white immature grain generation rate about the rice of a certain variety. It is a figure which shows the relationship between NDVI at the time of additional fertilization and the required fertilization amount when the target value of a specific white immature grain ratio and the expected temperature of a target ripening period are predetermined values. It is a figure which shows an example of the content of the fertilizer application related information database. It is a figure which shows the relationship between NDVI at the time of additional fertilization and the required fertilization amount in the case where the yield target value and the expected temperature of the target growing season are the predetermined values in wheat.

  An embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. FIG. 1 is a block diagram showing a configuration example of a fertilizer application determination device 1 according to the present embodiment. As shown in FIG. 1, the fertilizer application rate determination device 1 is connected to a display device 2 such as a liquid crystal display or an organic EL display, and an input device 3 such as a mouse or a keyboard.

  As shown in FIG. 1, the fertilizer application rate determination device 1 has, as a functional configuration, a communication unit 10, a fertilizer application related information generation unit 11, a vegetation index information generation unit 12, an estimated temperature information generation unit 13, and a fertilization amount related information acquisition unit. 14, a vegetation index information acquisition unit 15 (corresponding to “vegetation-related information acquisition unit” in claims), an estimated temperature information acquisition unit 16 and a fertilizer application determination unit 17. Each of the functional blocks 10 to 17 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the functional blocks 10 to 17 is actually configured to include a CPU, RAM, ROM, etc. of a computer, and a program stored in a recording medium such as RAM, ROM, hard disk or semiconductor memory. Is realized by operating.

  As shown in FIG. 1, the fertilizer application rate determination device 1 includes an analysis information storage section 20, a fertilizer application related information storage section 21, a vegetation index information storage section 22, and an estimated temperature information storage section 23 as storage means. .. The data stored in these storage units will be described later.

  The fertilizer application amount determination device 1 is a device that determines the amount of fertilizer to be applied (applying amount will be described later in detail) (applying amount) and provides the user with information indicating the applied amount. The user can appropriately determine the amount of fertilizer to be actually applied (fertilization amount) by referring to the information on the fertilization amount provided by the fertilization amount determination device 1 in the additional fertilization. In the following explanation, regarding the target rice and rice cultivation, rice varieties, environment in which rice cultivation is performed (region (cold region, warm region, arid region, etc.), altitude, field size, rice cultivation method, etc. ), The type of fertilizer applied at the time of additional fertilization, and other external environment that affects the growth of rice shall be common. Therefore, the fertilization amount determined by the fertilization amount determination device 1 is an appropriate fertilization amount when a specific type of fertilizer is applied to rice of a specific variety cultivated in a specific environment. Hereinafter, the results of the research conducted by the inventors will be described first, and then the functions and processing of the fertilizer application rate determination device 1 will be described.

  The inventors of the present invention are ones who make the appearance quality of brown rice harvested by rice cultivation one of the research subjects. As is well known, after rice is transferred from the rice field to the field by rice planting, it goes through the stages of tillering period → earing stage → heading period → flowering / pollination period → panning stage → ripening stage → maturation stage. grow up. The earing stage is approximately 20 to 25 days before heading. During the period from before and after the ear emergence period to before and after the ear emergence period (hereinafter referred to as the “top fertilization target period”), usually, the number of paddy grains that settle on the spikes and the amount of starch stuck in the paddy are increased. For the purpose, additional fertilizer (mainly nitrogen fertilizer) is added to the fertilizer (sometimes called hot manure). In the present embodiment, the term “additional fertilizer” means addition of fertilizer performed at a predetermined timing in the additional fertilizer application period, unless otherwise specified. Further, the ripening period refers to about 40 to 50 days from the flowering / pollination period, and rice produces starch during this ripening period and accumulates in endosperm in brown rice.

  Unhulled rice from which rice husks have been removed from paddy harvested by rice cultivation is called "immature grain" such as "white immature grain", "damaged grain", "dead rice", "colored grain" depending on the appearance quality. , And can be classified as high-quality “sized particles” that do not correspond to these. In addition, "white immature grains" include "belly white grains" that are cloudy on the same side as the embryo, "back white grains" that are cloudy on the side opposite the embryo, and "base that is cloudy at the base near the embryo. It can be classified into "immature grain", "heart white grain" in which the central part of the endosperm is cloudy, and "milky grain" in which more than half of the endosperm is cloudy. The proportion of sized rice in the harvested brown rice may be a condition for determining the quality of brown rice for staple food. For example, when the proportion of sizing is 70% or more, it is 1 grade, when it is 60% or more, it is 2 grades, when it is 45% or more, it is 3 grades, and when it is less than 45%, it is nonstandard. Depending on the grade, a grade indicating quality may be determined. Since the grade of brown rice determined in this way is reflected in the price of brown rice, it is a very important issue for the producer to suppress the generation of white immature grains.

  Here, the temperature of the first half of the ripening period, which comes after heading, affects the proportion of white unripe grains in the harvested brown rice (hereinafter referred to as "white unripe grain ratio"), and particularly in the first half of the ripening period. The higher the temperature, the higher the proportion of white immature grains tends to be. Fig. 2 shows the average value of the daily average temperature of "20 days after heading corresponding to the first half of the ripening period" (hereinafter referred to as "verification period" in the explanation of Fig. 2) and the white immaturity of a certain variety of rice. The relationship with the grain ratio is shown. The source of FIG. 2 is “Morita Satoshi. 2005. White immature grains, insufficient filling and grain weight reduction caused by high temperature during ripening stage of paddy rice. Agricultural technology 60: 6-10.”. FIG. 2 is a plot diagram having a horizontal axis representing the average value of the daily average temperature and a vertical axis representing the white immature grain ratio, and each point in the figure shows what the average value of the daily average temperature during the verification period is. It shows what percentage the white immature grain ratio was. Further, in FIG. 2, an approximate curve based on each plotted point is drawn.

  As shown in FIG. 2, in the range where the daily average temperature can be in the verification period (range of about 22 ° C. to 29 ° C.), there is a strong positive difference between the average value of the daily average temperature and the white immature grain ratio in the verification period. The higher the average value of the daily average temperature during the verification period, the higher the white immature grain ratio. In particular, when the average value of the daily average temperature during the verification period becomes 27 ° C or higher, the increase in the white immature grain ratio with respect to the increase in the average daily temperature becomes extremely large. Grain ratio increases by about 10%. As described above, the higher the temperature in the first half of the ripening period, the higher the percentage of white immature grains tends to be.

  Furthermore, the present inventors have recognized that one of the causes of a high white immature grain ratio when the temperature in the first half of the ripening period is high is as follows. That is, among the white immature grains, the dorsal white grains tend to occur frequently when the temperature is high in the first half of the ripening period and the brown rice protein is low. It was newly found that the temperature tends to occur frequently when the temperature is high and the brown rice protein is low, and one of the causes is the base caused by the high temperature in the first half of the ripening period and the low brown rice protein. It was recognized that there were multiple immature grains and dorsal grains. Hereinafter, the period that is the first half of the ripening period and is assumed to cause frequent occurrence of immature base grains and dorsal white grains when the temperature is high is referred to as “target ripening period”. The target ripening period is 15 to 20 days after the heading, which corresponds to the first half of the ripening period. In addition, in the following explanation, when the term “air temperature during target ripening period (or expected temperature)” is used, unless stated otherwise, the average value of daily average temperature of each day during the target ripening period (or expected average value) ) Means.

  Furthermore, as a result of research based on the fact that the base immature grains and dorsal white grains frequently occur due to the high temperature in the target ripening stage and the low brown rice protein, the inventors have studied the additional fertilization target period (as described above, The amount of fertilizer applied during topdressing, which is the period from the formation of panicles to the time of heading), the activity of the rice community (vegetation) during this topdressing, and the temperature of the target ripening period that comes after topdressing , It was found that it affects the generation of immature grains and white back grains. Furthermore, the NDVI (Normalized Difference Vegetation Index) at the time of topdressing that can be used as an indicator of the activity of the rice canopy and the expected temperature during the target ripening period should be combined appropriately to adjust the fertilizer application rate during topdressing. It was also found that the possibility of suppressing the immature base grains and the white back grain is suppressed. It was also found that the yield may be improved by appropriately adjusting the amount of fertilizer applied during additional fertilization. Note that NDVI will be described later.

  Under this possibility, the present inventors grow a plurality of groups having different fertilizer application amounts during topdressing, NDVI during topdressing, and temperature during the target ripening period, and also develop immature base grains and dorsal grains in each group. , Especially the "proportion of base immature grains and dorsal white grains in harvested brown rice" was observed. Hereinafter, the ratio of the base immature grain and the back white grain in the harvested brown rice is referred to as "specific white immature grain ratio" and is distinguished from "white immature grain ratio". The specific white immature grain ratio corresponds to the "low quality ratio" in the claims.

  Furthermore, the inventors performed multiple regression analysis on the observation results for each group with the specific white immature grain ratio as the target variable and the fertilizer application amount during topdressing, NDVI during topdressing, and the temperature during the target ripening period as explanatory variables. The fertilization amount calculation formula K1 for calculating the fertilization amount by substituting the NDVI at the time of additional fertilization as a variable for each combination of the specific white immature grain ratio and the temperature during the target ripening period was calculated. The value that the specific white immature grain ratio can take and the value that the temperature during the target ripening period can take can be set in advance.

  By using the fertilization amount calculation formula K1, the specific white immature grain ratio is set as the target value when the NDVI at the time of additional fertilization is the predetermined value and the temperature during the ripening period is expected to be the predetermined temperature. It is possible to calculate the amount of fertilizer required at the time of topdressing. That is, when the target value of the specific white immature grain ratio and the expected temperature during the ripening period are determined, the corresponding fertilization amount calculation formula K1 is determined. By substituting the NDVI at the time of additional fertilization into this fertilization amount calculation formula K1, the amount of fertilization required at the time of additional fertilization can be calculated. Hereinafter, the amount of fertilizer required for additional fertilization will be referred to as "required amount of fertilizer". In addition, "the specific white immature grain ratio is set as a target value" means that the value of the specific white immature grain ratio is equal to or less than a target value (for example, "10%"). Further, the "necessary fertilizer application amount" means the minimum amount of fertilizer required to set the specific white immature grain ratio as a target value.

  The inventors calculated the fertilization amount calculation formula K1 by the above method and confirmed its significance.

  FIG. 3 shows NDVI at the time of additional fertilization expressed by the fertilization amount calculation formula K1 for each of the three examples of the expected temperature during the target ripening period when the target value of the specific white immature grain ratio is “10%”. It is a figure which shows the relationship with a required fertilization amount. In each figure of FIG. 3, the horizontal axis represents NDVI and the vertical axis represents the required fertilizer application amount (unit: Nkg / 10a), which shows the relationship between the NDVI and the required fertilizer application amount at the time of additional fertilization. The expected temperature during the target ripening period in FIG. 3 (A) is “26.8 ° C.”, and the expected temperature during the target ripening period in FIG. 3 (B) is “27.0 ° C.”, and FIG. The expected temperature during the target ripening period in () is "27.2 ° C".

  As is clear from each figure in FIG. 3, if the target value of the specific white immature grain ratio is the same, the smaller the NDVI at the time of additional fertilization is, the larger the required fertilization amount is, regardless of the expected temperature during the target ripening period. As described above, this is because the lack of brown rice protein affects the specific white immature grain ratio, and when NDVI is assumed to be small, the fertilizer application amount is increased to improve the nitrogen nutrition state. One of the reasons is that it contributes effectively to the reduction of the specific white immature grain ratio.

  Further, as is clear from each figure of FIG. 3, when the target value of the specific white immature grain ratio is the same and the NDVI is the same value, the required fertilization rate increases as the value of the expected temperature during the target ripening period increases. growing. For example, in FIG. 3 (A) in which the expected temperature during the target ripening period is “26.8 ° C.”, the required fertilizer application amount when the NDVI is “0.82” is the “A value”, and the target ripening period is In Fig. 3 (B), where the expected temperature of "27.0 ° C" is "27.0 ° C", the required fertilization rate is "B value" (> "A value") when NDVI is "0.82", and the target ripening is In FIG. 3C in which the expected temperature in the period is “27.2 ° C.”, the required fertilizer application amount is “C value” (> “B value”) when NDVI is “0.82”. This is related to the temperature during the target ripening period and the amount of fertilizer applied during topdressing, and when the temperature during the target ripening period is high, increasing the amount of fertilizer applied during topdressing enables specific white immature grains to be added. One of the reasons is that it is possible to reduce the commission.

  When the required additional fertilizer amount is Y and the NDVI value is x, for example, the fertilization amount calculation formula K1 is “Y = -18.129x + 15.487” in the case of FIG. 3 (A) and “Y = -18.129x +17.315 ", and in the case of FIG. 3C," Y = -18.129x +19.141 ". However, the fertilizer application calculation formula K1 is not limited to such a linear formula. Any formula can be applied as long as an appropriate required additional fertilizer amount can be obtained from the NDVI value and the temperature during the ripening period.

  A specific relationship between the target value of the specific white immature grain ratio, the expected temperature during the target ripening period, the NDVI at the time of topdressing, and the required fertilizer application amount, as shown in FIG. 3, in particular, the target value of the specific white immature grain ratio The specific relationship between NDVI at the time of topdressing and the required fertilizer application amount for each combination of the target temperature and the expected temperature during the ripening period was clarified by the study by the inventors.

  Now, the communication unit 10 communicates with an external device according to a predetermined communication standard via a LAN or a network N including the Internet.

  The analysis information storage unit 20 stores the analysis information database 20a. The analysis information database 20a is a database in which the amount of fertilizer applied during topdressing, the NDVI during topdressing, and the temperature during the target ripening period are common, and the analysis information is cumulatively stored for each group that is collectively harvested. The information for analysis about a certain group is information indicating the amount of fertilizer applied to the group at the time of topdressing, NDVI at the time of topdressing of that group, and information indicating the temperature of the target ripening period that arrived after topdressing for that group. , The information indicating the specific white immature grain ratio at the time of harvest for that group, and the accompanying information about that group. For the incidental information, the fertilization amount calculation formula K1 is calculated based on the information for analysis such as information that can specify the period in which the group has been cultivated (year, etc.), abnormal weather that can be considered as an exception during cultivation of the group, and the like. This is information about the event that should be taken into consideration. Each piece of analysis information is appropriately generated by the user based on the observation result for the group, and registered in the analysis information database 20a.

The fertilizer application information storage unit 21 stores a fertilizer application information database 21a.
The fertilization amount related information database 21a is a database that stores the fertilization amount calculation formula K1 in association with each other for each combination of the target value of the specific white immature grain ratio and the expected temperature during the target ripening period. In the present embodiment, possible values are predetermined for the target value of the specific white immature grain ratio and the expected temperature of the target ripening period. For example, the target value of the specific white immature grain ratio is set to take a value in increments of "2%" in the range of "10%" to "20%", and regarding the expected temperature during the target ripening period, It is stipulated that the value be taken in increments of "0.2 ° C" in the range of "20 ° C" to "35 ° C". FIG. 4 schematically shows a simplified example of the contents of the fertilizer application information database 21a.

  The fertilization amount related information generation unit 11 updates the fertilization amount related information database 21a based on the analysis information database 20a at a predetermined timing. The predetermined timing is, for example, a timing when a user gives an instruction, a timing when the analysis information database 20a is updated, or a predetermined regular timing. Hereinafter, the process of the fertilization amount related information generation unit 11 when updating the fertilization amount related information database 21a will be described in detail.

  The fertilizer application related information generation unit 11 refers to the analysis information database 20a and acquires each of the analysis information stored in the analysis information database 20a. At this time, the fertilization amount related information generating unit 11 may exclude the analysis information that is not appropriate to be used for calculating the fertilization amount calculation formula K1 based on the accompanying information included in the analysis information.

  Next, the fertilizer application related information generation unit 11 performs a multiple regression analysis on the acquired analysis information, and determines the specific white immature grain ratio (corresponding to the target value of the specific white immature grain ratio) and the temperature of the target ripening period (target A fertilizer application formula K1 is calculated for each combination with the expected temperature during the ripening period). As described above, the fertilizer application calculation formula K1 is a mathematical expression for substituting NDVI for additional fertilization as a variable to calculate the fertilizer application amount (corresponding to the required fertilizer application amount). In calculating the fertilization amount calculation formula K1, the fertilization amount related information generation unit 11 determines that the analysis information having an abnormal value or the temporally old analysis information is applied based on the accompanying information included in the analysis information. Statistical processing may be performed to reduce the degree of influence on the calculation of the quantity calculation formula K1.

  After calculating the fertilization amount calculation formula K1 for each combination of the specific white immature grain ratio and the temperature during the target ripening period, the fertilization amount related information generation unit 11 uses the calculated fertilization amount calculation formula K to calculate the fertilization amount relation. The corresponding fertilization rate calculation formula K1 in the information database 21a is updated. As a result of the above-described processing being performed by the fertilization amount related information generation unit 11, the content of the fertilization amount calculation formula K1 stored in the fertilization amount related information database 21a is the analysis information cumulatively stored in the analysis information database 20a. Will be reflected.

  The vegetation index information generation unit 12 generates vegetation index information having NDVI as a value at a predetermined timing and stores it in the vegetation index information storage unit 22. The predetermined timing may be a timing before the timing at which the fertilizer application rate determination unit 17 determines the required fertilizer application rate. Hereinafter, the processing of the vegetation index information generation unit 12 when generating the vegetation index information and storing it in the vegetation index information storage unit 22 will be described in detail.

  The vegetation index information generation unit 12 acquires image data for analysis. The image data for analysis is image data generated by capturing a predetermined area of the field to be topdressed from above by a multispectral sensor mounted on the drone at a timing close to the timing of topdressing. .. The image data for analysis is previously stored in a predetermined storage area by the user. The vegetation index information generation unit 12 analyzes the acquired image data for analysis and calculates NDVI by a known method. After calculating the NDVI, the vegetation index information generating unit 12 stores the vegetation index information having the calculated NDVI as a value in the vegetation index information storage unit 22.

  In the present embodiment, when calculating NDVI, image data for analysis based on the imaging result of the multi-spectral sensor mounted on the drone is used. Here, as a parameter used when determining the amount of fertilizer applied, it is possible to use SPAD, which can be used as an index for measuring the activity of rice derived from leaf color like NDVI, instead of NDVI. However, when the SPAD value is used, it is necessary to measure the leaves one by one using a chlorophyll meter, which makes the work difficult. In particular, in the case of a large-scale field, in order to calculate the SPAD value with high accuracy, it is necessary to perform measurement using a chlorophyll meter at appropriately dispersed points, which makes the work extremely difficult. On the other hand, in the present embodiment, since the data necessary for calculating the NDVI is collected using the drone, the work to be performed in calculating the NDVI is simple, and the work can be performed even when the field is large. The difficulty does not increase. However, instead of excluding the use of the SPAD value, the SPAD value or an index according to the SPAD value may be used.

  Note that this effect is obtained by measuring the vegetation index (NDVI in the present embodiment) obtained by remote sensing of the rice canopy, instead of measuring the leaves one by one using a chlorophyll meter. It can be obtained by using it as a parameter used when making a determination. Therefore, the device used for sensing is not limited to the multi-spectral sensor, and may be infrared thermography, for example. The vegetation index is not limited to NDVI and may be any index calculated by an appropriate method according to the device used for sensing. Further, the sensing by the device does not necessarily have to be performed by using a drone, and may be performed by using a device installed at the upper part of the tower or may be performed artificially by using a stepladder. Further, a satellite photograph may be used for calculating NDVI (or an index corresponding thereto).

  The predicted temperature information generation unit 13 generates predicted temperature information indicating the predicted temperature of the target ripening period at a predetermined timing and stores it in the predicted temperature information storage unit 23. The predetermined timing may be a timing before the timing when the fertilizer application rate determination unit 17 determines the required fertilizer application rate. Hereinafter, the process of the predicted temperature information generation unit 13 when the predicted temperature information is generated and stored in the predicted temperature information storage unit 23 will be described in detail.

  The predicted temperature information generation unit 13 communicates with a predetermined server via the network N to acquire the predicted value of the daily average temperature of each day belonging to the target ripening period from the predetermined server. The predetermined server is a server that provides an expected value of the daily average temperature for each "day" for a certain range in the future. The date to which the target ripening period belongs is registered in advance by the user. The expected temperature information generation unit 13 averages each of the obtained expected values of the average daily temperature to calculate the “estimated temperature of the target ripening period”, and obtains the estimated temperature information indicating the calculated expected temperature of the target ripening period. It is generated and stored in the expected temperature information storage unit 23.

  The method of calculating the predicted temperature of the target ripening period by the predicted temperature information generation unit 13 may be a method other than the method exemplified in this embodiment. For example, the user may calculate the predicted temperature by a predetermined method and input it to the predicted temperature information generation unit 13. Further, in calculating the expected temperature, weather conditions such as the weather expected in the target ripening period (such as a lot of rain or a typhoon may come) may be taken into consideration.

  The vegetation index information acquisition unit 15 acquires the vegetation index information stored in the vegetation index information storage unit 22 in response to a request from the fertilizer application determination unit 17. The vegetation index information acquisition unit 15 outputs the acquired vegetation index information to the fertilizer application determination unit 17.

  The predicted temperature information acquisition unit 16 acquires the predicted temperature information stored in the predicted temperature information storage unit 23 in response to a request from the fertilizer application determination unit 17. The predicted temperature information acquisition unit 16 outputs the acquired predicted temperature information to the fertilizer application rate determination unit 17.

  The fertilizer amount related information acquisition unit 14 accesses the fertilizer amount related information database 21a stored in the fertilizer amount related information storage unit 21 in response to the request from the fertilizer amount determination unit 17, and calculates an appropriate fertilizer amount calculation formula K1. get. The fertilization amount related information acquisition unit 14 outputs the acquired fertilization amount calculation formula K1 to the fertilization amount determination unit 17. Hereinafter, the process of the fertilization amount related information acquisition unit 14 when acquiring the appropriate fertilization amount calculation formula K1 will be described in detail.

  As will be described later, the fertilizer application rate determination unit 17 notifies the fertilizer application related information acquisition unit 14 of the target value information and the expected temperature information, and requests the fertilizer application information calculation formula K1 to be acquired. The target value information, which will be described in detail later, is information indicating the target value of the specific white immature grain ratio designated by the user. In response to this request, the fertilizer amount related information acquisition unit 14 accesses the fertilizer amount related information database 21a stored in the fertilizer amount related information storage unit 21.

  The fertilizer amount related information acquisition unit 14 is notified of the target value of the specified white immature grain ratio of the notified target value information value in the fertilizer amount calculation formula K1 stored in the fertilizer amount related information database 21a. The fertilizer application calculation formula K1 associated with the combination of the value of the expected temperature information with the expected temperature of the target ripening period is specified and acquired. The fertilization amount calculation formula K1 acquired here corresponds to "fertilization amount related information" in the claims. The fertilization amount related information acquisition unit 14 outputs the acquired fertilization amount calculation formula K1 to the fertilization amount determination unit 17.

  The fertilizer application rate determination unit 17 of the fertilizer application rate determination device 1 determines the required fertilizer application rate according to the user's instruction and provides the user with information indicating the determined required fertilizer application rate. Hereinafter, the processing of the fertilizer application rate determination unit 17 will be described in detail.

  The user who plans to add fertilizer operates the input device 3 to instruct the display of a dedicated user interface (hereinafter, referred to as “dedicated UI”). When the fertilization amount determination unit 17 detects that the instruction has been given, the fertilization amount determination unit 17 displays a dedicated UI on the display device 2. The dedicated UI is a user interface for inputting a target value of a specific white immature grain ratio, and an input field for inputting a target value of a specific white immature grain ratio (for example, from a pull-down menu in which target value candidates are displayed in a list. An input field is provided in which information can be entered by selecting a specific target value. The user inputs the target value in the input field and performs a predetermined operation to confirm the input.

  When it is detected that the input to the input field has been confirmed, the fertilizer application determination unit 17 generates target value information indicating the target value input to the input field. The fertilizer application rate determination unit 17 requests the vegetation index information acquisition unit 15 to acquire vegetation index information, and inputs the vegetation index information acquired by the vegetation index information acquisition unit 15 in response to the request. The fertilizer application rate determination unit 17 requests the expected temperature information acquisition unit 16 to obtain the expected temperature information, and inputs the expected temperature information obtained by the expected temperature information acquisition unit 16 in response to the request.

  Next, the fertilization amount determination unit 17 notifies the fertilization amount related information acquisition unit 14 of the generated target value information and the predicted temperature information input from the predicted temperature information acquisition unit 16, and also calculates the fertilization amount calculation formula K1. Of the fertilizer application amount, and inputs the fertilizer application formula K1 acquired by the fertilizer application related information acquisition unit 14 in response to the request.

  After inputting the fertilization amount calculation formula K1, the fertilization amount determination unit 17 substitutes the NDVI indicated by the vegetation index information input from the vegetation index information acquisition unit 15 into the input fertilization amount calculation formula K1 to calculate the required fertilization amount. To do. As described with reference to FIG. 3, if the target value of the specific white immature grain ratio is the same, the required fertilization amount calculated here has a small NDVI at the time of additional fertilization regardless of the expected temperature during the target ripening period. The higher the value. Further, when the target value of the specific white immature grain ratio is the same and the NDVI is the same value, the fertilizer application amount calculated here becomes larger as the value of the expected temperature during the target ripening period is larger. There is.

  The fertilizer application rate determination unit 17 displays information indicating the calculated required fertilizer application rate on the display device 2 in a predetermined manner. The required fertilization amount indicated by the information displayed on the display device 2 is the minimum required fertilization amount for achieving the target value specified by the user for the specific white immature grain ratio. In addition, the required fertilizer application amount indicated by the information displayed on the display device 2 here is the fertilizer application amount that contributes to the increase of the yield and the control of the protein content rate. The user can finally decide the fertilizer having an appropriate fertilization amount from the viewpoint of suppressing the specific white immature grain ratio by referring to the proposed fertilization amount.

  As described above in detail, in the present embodiment, the fertilizer application rate determination unit 17 acquires the vegetation index information indicating NDVI at the time of additional fertilization and the expected temperature information indicating the expected temperature during the target ripening period, and further, the fertilizer application rate. The calculation formula K1 (information on fertilizer application amount) is acquired. This fertilizer application formula K1 is used to calculate the actual fertilizer application rate in the past, the vegetation index at the time of additional fertilization, the temperature during the ripening period that has arrived after the additional fertilization, and the specific white immature grain ratio in the harvest performed after the ripening period. It is information generated based on the above, and is information regarding the amount of fertilizer required at the time of additional fertilization in order to set the specific white immature grain ratio as the target value when the temperature during the ripening period is expected to be the predetermined temperature. Then, the fertilizer application rate determination unit 17 determines the fertilizer application rate at the time of additional fertilization based on the fertilizer application rate calculation formula K1. The present embodiment also provides a method for determining the amount of fertilizer applied based on the information about the vegetation at the time of additional fertilization based on the image data for analysis of rice (agricultural products) and the expected temperature during the ripening period or the growing period of the agricultural products. In addition, the present embodiment provides a method of increasing the fertilizer application amount as the value of the expected temperature is higher when the information on vegetation (NDVI in the present embodiment) is the same.

  According to the present embodiment, the fertilization such that the specific white immature grain ratio is set as the target value, reflecting the relationship between the past actual fertilization amount, the vegetation index, and the temperature during the ripening period. The amount can be appropriately determined according to the combination of the vegetation index during topdressing and the expected temperature during the ripening period. In other words, according to the present embodiment, a new factor that takes into consideration factors that have been found to affect the appearance quality and yield of brown rice, such as the amount of fertilizer applied during topdressing, the vegetation index during topdressing, and the temperature during the ripening period after topdressing, has been considered. It is possible to determine the appropriate fertilizer application rate by the method.

  Although one embodiment of the present invention has been described above, the above embodiment is merely an example of the embodiment for carrying out the present invention, and the technical scope of the present invention is thus interpreted in a limited manner. It should not be done. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

  For example, in the above-described embodiment, the fertilizer application amount determination device 1 uses the fertilizer application information database 21a stored in the fertilizer application information storage unit 21 to calculate the target value of the specific white immature grain ratio and the expected temperature during the ripening period. For each combination, the fertilization amount calculation formula K1 for substituting the NDVI at the time of additional fertilization to calculate the required fertilization amount was stored. However, the form of data stored in the fertilizer application amount determination device 1 and used to determine the required fertilizer application amount is not limited to the example illustrated in the above embodiment, and the fertilizer application related information acquisition is performed according to the data form. The content of the fertilizer application amount related information acquired by the unit 14 can be changed.

  As an example, instead of the fertilization amount related information database 21a, a database that stores an appropriate required fertilization amount for each combination of the target value of the specific white immature grain ratio, the expected temperature during the ripening period, and the NDVI during topdressing is stored. It may be configured to. The appropriate required fertilization amount is the fertilization amount calculated based on the results of multiple regression analysis for the combination of the target value of the specific white immature grain ratio, the expected temperature during the ripening period, and the NDVI during topdressing. .. In this case, the fertilization amount related information acquired by the fertilization amount related information acquisition unit 14 is the required fertilization amount associated with the combination of the value of the target value information, the value of the vegetation index information, and the value of the predicted temperature information in the database. Can be information indicating.

  Further, the fertilization amount related information storage unit 21, the vegetation index information storage unit 22, and the expected temperature information storage unit 23 may be included in an external storage device different from the fertilization amount determination device 1.

  Further, the fertilization amount related information generating unit 11 may be included in a device different from the fertilization amount determination device 1. The same applies to the vegetation index information generation unit 12 and the predicted temperature information generation unit 13.

  In the above embodiment, the user specifies the target value of the specific white immature grain ratio, but the target value may be a fixed value.

  Further, the fertilizer application rate determination device 1 is configured as a cloud server, and when a client requests the provision of the required fertilizer application rate via the network N, the required fertilizer application rate is calculated by the above-described method and provided to the client. It may be configured.

  The method of calculating the fertilizer application amount calculation formula K1 described in the above embodiment is merely an example, and the fertilizer application amount calculation formula K1 may be calculated by another method. For example, the objective variable is set to a leaf color at the earing stage that is closely related to the specific white immaturity ratio (note that it is known that when the leaf color at the earring stage is dark, the rate of immature base grains and dorsal white grain generation decreases). Good. In addition, the target variable is set to the specific white immaturity rate or the leaf color at the heading stage, and the explanatory variables are set only to the fertilization amount at the time of additional fertilization and NDVI. The required fertilizer application amount may be calculated based on the formula, and may be referred to when fertilizing.

  Further, in the above-described embodiment, the vegetation index information generation unit 12 of the fertilizer application determination device 1 analyzes the image data for analysis to calculate the vegetation index (NDVI), and the vegetation index information acquisition unit 15 calculates the vegetation index. It was a configuration to acquire. However, the method for the vegetation index information acquisition unit 15 to acquire the vegetation index is not limited to the method exemplified in the above embodiment. As an example, it is also possible to acquire by the following method. That is, at a paddy rice production site, a trader who specializes in photographing using a drone acquires the analysis image data and uploads it to a predetermined server on the network N. The configuration may be such that another subject analyzes it to calculate a vegetation index and acquires it by communication via the network N.

  Further, in the above-described embodiment, the information acquired by the vegetation index information acquisition unit 15 is information indicating the vegetation index (more specifically, NDVI). That is, in the above-described embodiment, “information indicating a vegetation index (NDVI)” corresponds to “information about vegetation” in the claims. However, the information acquired by the vegetation index information acquisition unit 15 is not limited to the information indicating the vegetation index (NDVI). That is, any information can be used as long as it is information about vegetation and can be used to calculate the fertilizer application calculation formula K1.

  Further, in the above-described embodiment, regarding the quality, the amount of fertilizer applied is focused on the "appearance" quality of brown rice and the deterioration of the appearance quality is suppressed (more specifically, the specific white immature grain ratio is suppressed). It was determined. However, as for quality, not only the appearance quality is taken into consideration in the determination of the fertilizer application amount, but the quality of brown rice components such as protein content may be taken into consideration in addition to the appearance quality or instead of the appearance quality. .. That is, the "state of harvested rice" in the claims is not limited to the specific white immature grain ratio, but the amount of fertilizer applied during topdressing, information on vegetation during topdressing, and the ripening period after topdressing. It may be "rice condition" that is affected by the temperature of. For example, the “state of harvested rice” may be a state in which the quality of ingredients such as protein content is taken into consideration, or a state in which only the quality of ingredients is focused, and the state in which the yield is taken into consideration. Alternatively, it may be a state in which only the yield is focused. That is, the amount of fertilizer applied during topdressing, information about vegetation during topdressing, and the temperature during the ripening period after topdressing have an influence on the appropriateness of yield and protein content, and information about vegetation during topdressing. By adjusting the amount of fertilizer applied according to the combination with the expected temperature during the ripening period, it is possible to improve the yield of the harvested rice and the appropriateness of the protein content. It is known that when the amount of nitrogen fertilization is large, the protein content increases, and the taste closely related to protein deteriorates. Therefore, it is possible to suppress the protein content and improve the quality and yield at the production site. It has been demanded. In addition, for example, the “state of harvested rice” is related to the state of “falling over” (the plant collapses before harvesting, making it difficult to harvest) (for example, the proportion of the overgrown rice in the entire field). Or the angle at which the rice in the entire field falls down). In other words, the amount of fertilizer applied during topdressing, information about vegetation during topdressing, and the temperature during the ripening period after topdressing affect the state related to lodging. It is possible to improve the state related to lodging (for example, to reduce the rate of lodging) by adjusting the amount of fertilizer applied according to the combination with the expected temperature.

  Further, although the above-described embodiment relates to rice, the fertilizer application rate determining device and the fertilizer application rate determining method according to the present invention are not limited to rice, and other agricultural crops such as wheat, barley or soybean grains and the like. Any plant such as vegetables and fruits can be similarly used. That is, other crops also obtain information on vegetation about crop communities during topdressing and the expected temperature during the ripening period or growth period after topdressing, as well as the actual amount of fertilizer applied during topdressing in the past and vegetation during topdressing. The temperature during the ripening or growing season, which is generated based on information, the temperature during the ripening or growing season that has arrived after topdressing, and the state of the crops that have been harvested after the ripening or after the growing season, is at the specified temperature. If it is expected that there is fertilization amount related information regarding the amount of fertilization required at the time of additional fertilization to set the state of the crop as the target state, and by determining the fertilization amount based on each acquired information, the harvest Since it is possible to improve the condition of the crops to be used, the fertilizer application rate determining apparatus and the fertilizer application rate determining method according to the present invention can be used similarly to rice. Specifically, for example, in the case of wheat, barley, and soybean, the appearance quality corresponding to the "white immature grain", which is the appearance quality of rice described above, can be defined respectively, and components such as protein content can be defined. It is possible to define things such as quality and yield, and the present invention can be used to improve these.

  For example, FIG. 5 shows this with respect to the "yield" of "wheat". Figure 5 is similar to Figure 3 for rice. That is, in the case where the yield target value of wheat is common, the relationship between the NDVI at the time of additional fertilization and the required fertilization amount represented by the fertilization amount calculation formula K1 is shown for each of the three examples of the expected temperature during the target ripening period. FIG. In each figure of FIG. 5, a graph in which NDVI is plotted on the horizontal axis and the required fertilizer application amount (unit: Nkg / 10a) is plotted on the vertical axis, shows the relationship between NDVI at the time of additional fertilization and the required fertilizer application amount. The expected temperature during the target ripening period in FIG. 5 (A) is “14 ° C.”, and the expected temperature during the target ripening period in FIG. 5 (B) is “17 ° C.”. The expected temperature at maturity is "20 ° C".

  As is clear from each figure in FIG. 5, if the target yield value is the same, the smaller the NDVI at the time of additional fertilization, the larger the required fertilizer application amount, regardless of the expected temperature during the target ripening period. This is because, as in the case of the above-mentioned rice, the lack of brown rice protein affects the yield reduction, and when NDVI is assumed to be small, the fertilizer application amount should be increased to improve the nitrogen nutrition state. This is one of the reasons why it contributes to the reduction of yield decrease.

  Further, as is clear from the respective diagrams of FIG. 5, when the target value of wheat yield is the same and the value of NDVI is the same, the required fertilization amount increases as the value of the expected temperature during the target ripening period increases. .. For example, in FIG. 5 (A) in which the expected temperature during the target ripening period is “14 ° C.”, the required fertilization amount when the NDVI is “0.7” is the “A value”, and the target ripening period is predicted. In FIG. 5 (B) where the temperature is “17 ° C.”, the required fertilization amount when NDVI is “0.7” is “B value” (> “A value”), and the expected temperature during the target ripening period is In FIG. 5 (C) where is 20 ° C., the required fertilizer application amount when NDVI is “0.7” is “C value” (> “B value”). This is related to the temperature during the target ripening period and the amount of fertilizer applied during topdressing. When the temperature during the target ripening period is high, the decrease in yield is reduced by increasing the amount of fertilizer applied during topdressing. One of the reasons is that it is possible to do.

  In this way, when the information on the vegetation during topdressing is the same based on the image data for analysis of crops, the fertilizer application rate during topdressing is determined when the temperature during the target ripening period or the target growing season is high (expected to be high). The inventors have found that it is possible to reduce the quality deterioration and the yield decrease by increasing the amount in the same manner as in the case of rice as described above, and it can be generally said that it is an agricultural crop.

  When the required additional fertilizer amount is Y and the NDVI value is x, for example, the fertilization amount calculation formula K1 is “Y = −20x + 16” in the case of FIG. 5 (A) and “Y = −x” in the case of FIG. 5 (B). 20x + 17 ", and in the case of FIG. 5C, it can be shown as" Y = -20x + 17 ". However, the fertilizer application calculation formula K1 is not limited to such a linear formula. Any formula can be applied as long as an appropriate required additional fertilizer amount can be obtained from the NDVI value and the temperature during the ripening period.

  Further, the fertilizer application rate determination device 1 does not have to be a single computer, and may be composed of a plurality of computers. For example, the terminal connected via the Internet and the cloud server may function as the fertilizer application determination device 1 in cooperation with each other, and the terminal may appropriately cooperate with the cloud server to execute the process.

1 Fertilizer amount determination device 14 Fertilizer amount related information acquisition unit 15 Vegetation index information acquisition unit (vegetation related information acquisition unit)
16 Expected temperature information acquisition unit 17 Fertilizer amount determination unit

Claims (13)

A fertilization amount determination device for determining the fertilization amount during topdressing,
A vegetation-related information acquisition unit that acquires information on vegetation of agricultural products,
An expected temperature information acquisition unit that acquires expected temperature information indicating an expected temperature during the ripening period or the growing season of the crop,
Based on past actual fertilizer application rate, information on vegetation during topdressing, temperature during the ripening or growing season that arrived after topdressing, and the state of the crop harvested after the ripening or after the growing season The generated information, the information about the vegetation at the time of additional fertilization is in a predetermined state, and when the temperature during the ripening period or the growing season is expected to be a predetermined temperature, the state of the crop harvested A fertilization amount related information acquisition unit that acquires the fertilization amount related information regarding the fertilization amount required at the time of additional fertilization to make the target state,
Based on the information about the vegetation acquired by the vegetation related information acquisition unit, the estimated temperature information acquired by the estimated temperature information acquisition unit, and the fertilization amount related information acquired by the fertilizer amount related information acquisition unit A fertilizer application rate determination device, comprising: a fertilizer application rate determination unit that determines an applied rate of fertilization required for additional fertilization in order to set the state of the harvested crop to a target state.   The fertilizer application amount determination device according to claim 1, wherein the vegetation-related information acquisition unit acquires information about vegetation obtained by remote sensing of the community of the agricultural crop.   The fertilizer application amount determination device according to claim 2, wherein the vegetation-related information acquisition unit acquires information about vegetation obtained by remote sensing of a community of the agricultural crop using a drone. The vegetation-related information acquisition unit acquires information indicating a vegetation index as information on vegetation,
The fertilization amount related information acquisition unit, as the fertilization amount related information, the past fertilization amount at the time of actual additional fertilization, the vegetation index at the time of additional fertilization, the temperature of the ripening period or growth period that has arrived after additional fertilization, and the ripening period. The information generated based on the low quality ratio, which is the ratio of the crops of low appearance quality in the harvest performed after or after the growing season, the vegetation index at the time of topdressing is a predetermined value, and the ripening period. Or when the temperature of the growing season is expected to be a predetermined temperature, to obtain the fertilization amount related information on the fertilization amount required at the time of additional fertilization to set the low quality ratio as a target value,
The fertilization amount determination unit, information indicating the vegetation index acquired by the vegetation related information acquisition unit, the estimated temperature information acquired by the predicted temperature information acquisition unit, and acquired by the fertilization amount related information acquisition unit The fertilizer application amount according to any one of claims 1 to 3, wherein the fertilizer application amount required at the time of additional fertilization in order to set the low quality ratio to a target value is determined based on the fertilizer application amount related information. Decision device. The fertilizer amount determination unit,
When the target value of the low quality ratio is the same and the vegetation index is the same, the fertilizer application amount at the time of additional fertilization is determined such that the larger the expected temperature during the ripening period or the growing season is, the larger the amount is. The fertilizer application amount determination device according to claim 4. The fertilization amount related information is
About the amount of fertilizer applied at the time of actual topdressing in the past, the vegetation index at the time of topdressing, the temperature during the ripening period or the growing season that has arrived after topdressing, and the low quality ratio in the harvest performed after the ripening period or after the growing season, It was generated by using the multiple regression equation calculated by performing multiple regression analysis with the low quality ratio as an objective variable, the fertilization rate during topdressing, the vegetation index during topdressing and the temperature during the ripening period as explanatory variables. It is information. The fertilizer application amount determination device according to claim 4 or 5 characterized by things. The vegetation-related information acquisition unit acquires information about vegetation obtained by remote sensing of rice communities,
The predicted temperature information acquisition unit acquires the predicted temperature information indicating the predicted temperature during the ripening period of rice,
The fertilization rate related information acquisition unit is based on the past actual fertilization rate during topdressing, information about vegetation during topdressing, the temperature during the ripening period that has arrived after topdressing, and the state of the rice harvested after the ripening period. If the information about the vegetation during topdressing is in a predetermined state and the temperature during the ripening period is expected to be a predetermined temperature, the target is the state of the harvested rice. Acquire the fertilization amount related information about the fertilization amount required at the time of additional fertilization to be in a state,
The fertilizer amount determination unit, the vegetation information acquired by the vegetation related information acquisition unit, the predicted temperature information acquired by the predicted temperature information acquisition unit, and the fertilization amount related information acquisition unit acquired by the The fertilizer application amount determination device according to claim 1, wherein the fertilizer application amount determination device determines a fertilizer application amount required at the time of additional fertilization in order to set the state of the harvested rice to a target state, based on the fertilizer application amount related information. The vegetation-related information acquisition unit acquires information indicating a vegetation index as information on vegetation,
The fertilization amount related information acquisition unit, as the fertilization amount related information, the past fertilization amount during actual additional fertilization, the vegetation index at the time of additional fertilization, the temperature of the ripening period that has arrived after additional fertilization, and performed after the ripening period. Information generated based on the low quality ratio which is the ratio of low appearance quality brown rice in harvesting, when the vegetation index at the time of additional fertilization is a predetermined value, and the temperature during the ripening period is a predetermined temperature. If expected, to obtain the fertilization amount related information regarding the fertilization amount required at the time of additional fertilization to set the low quality ratio as a target value,
The fertilizer amount determination unit,
Information indicating the vegetation index acquired by the vegetation related information acquisition unit, the predicted temperature information acquired by the predicted temperature information acquisition unit, and the fertilization amount related information acquired by the fertilization amount related information acquisition unit The fertilization amount determination unit according to claim 7, further comprising: a fertilization amount determination unit that determines a fertilization amount required at the time of additional fertilization in order to set the low quality ratio as a target value. The fertilizer amount determination unit,
When the target value of the low quality ratio is the same and the vegetation index is the same, the fertilizer application amount during topdressing is determined such that the amount increases as the expected temperature during the ripening period increases. Item 14. The fertilizer application amount determination device according to item 8. The fertilization amount related information is
For the actual amount of fertilizer applied during actual topdressing in the past, the vegetation index during topdressing, the temperature during the ripening period that arrived after topdressing, and the low quality ratio in the harvest performed after the ripening period, the low quality ratio was the objective variable. The information is generated using a multiple regression equation calculated by performing a multiple regression analysis using the fertilizer application amount during topdressing, the vegetation index during topdressing and the temperature during the ripening period as explanatory variables. The fertilizer application amount determination device according to claim 8 or 9.   The fertilizer application amount determination according to any one of claims 7 to 10, wherein the vegetation-related information acquisition unit acquires information about vegetation obtained by remote sensing of a rice community using a drone. apparatus.   A method for determining a fertilizer application amount based on information on vegetation at the time of top fertilization based on image data for analysis of a crop and an expected temperature during the ripening or growing season of the crop.   The method of determining the fertilizer application amount according to claim 12, wherein the fertilizer application amount is increased as the value of the expected temperature is larger when the information on the vegetation is the same.