KR102596899B1 - System and method for monitoring crop growth - Google Patents

Abstract

The present invention relates to a crop growth monitoring system and method. The crop growth monitoring system according to an embodiment of the present invention includes an upper photosynthetic radiation sensor installed to measure the effective photosynthetic radiation at the top of the colony and a plurality of lower photosynthetic radiation sensors installed at the bottom of the colony to measure the effective photosynthetic radiation at the bottom of the colony. A photosynthetic effective radiation measurement unit including effective radiation sensors; and a processor that calculates the light extinction ratio using the upper amount of light incident on the upper photosynthetic effective radiation sensor and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors.

Description

Crop growth monitoring system and method {SYSTEM AND METHOD FOR MONITORING CROP GROWTH}

The present invention relates to a crop growth monitoring system and method, which monitors crop growth by calculating the light extinction ratio from photosynthetically active radiation (PAR).

A smart farm refers to a farm that can properly maintain and manage the growing environment for crops and livestock remotely and automatically by applying ICT (Information and Communication Technology) to greenhouses, glass greenhouses, livestock sheds, etc. In the agricultural field, smart farms are farms that can properly maintain and manage the growing environment of crops remotely or automatically by incorporating 4th industrial revolution technologies such as the Internet of Things (IoT), big data, artificial intelligence, and robots. This is developing. In order to create an optimal growth environment through smart farms, it is important to understand the growth status of crops. Crops are dynamically changing organisms, so continuous and continuous observation is required. The most representative growth parameters for understanding the growth of open field crops include crop canopy height, Leaf Area Index (LAI), and Normalized Difference Vegetation Index (NDVI). Applying the above growth parameters, which are widely used in general farming activities, to smart farms has the following pros and cons.

It is common to measure plant height in the field using a tape measure. This is a method of directly contacting and observing the target plant without special electronic equipment, and is generally the easiest way to obtain data. However, the accuracy of observation values may vary depending on the observer's skill level, and it may be difficult to continuously identify dynamically changing vegetation.

Leaf area index is an index that quantitatively represents changes in leaves, which are photosynthetic organs, as plants grow. Leaf area index can be observed by cutting leaves from plants and calculating the area of each leaf or using non-destructive portable optical equipment. Although leaf area index is a physiologically and ecologically very important growth parameter, this method also has the disadvantage of making it difficult to obtain continuous data.

The regular vegetation index is a representative vegetation index that uses vegetation and spectral reflectance to sensitively express plant biomass. The regular vegetation index consists of a red wavelength detection sensor and a near-infrared (NIR) wavelength detection sensor, and unlike plant height and leaf area index observations that rely on human observation, it can automatically obtain daily regular vegetation index values. However, in order to obtain data for calculating the regular vegetation index, the red wavelength detection sensor and the near-infrared wavelength detection sensor must be installed at a location higher than the maximum plant height of the crop, facing the top of the colony, so a structure taller than the plants is required. In addition, when using agricultural machinery such as a tractor for soil work, etc., the demolition and installation of structures must be repeated, which limits their use in actual farming activities.

The purpose of the present invention is to provide a crop growth monitoring system and method for monitoring crop growth with quantitative digital values by calculating the light extinction ratio from the effective photosynthetic radiation.

In order to achieve the above-mentioned purpose, the crop growth monitoring system according to an embodiment of the present disclosure includes an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation at the top of the colony and an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation at the bottom of the colony. A photosynthetic effective radiation measurement unit including a plurality of lower photosynthetic effective radiation sensors installed at the bottom of the colony; and a processor that calculates a light extinction ratio using the upper amount of light incident on the upper photosynthetically effective radiation sensor and the lower amount of light that reaches the plurality of lower photosynthetically effective radiation sensors.

The upper photosynthetic effective radiation sensor may be installed outside the colony unaffected by the shadow of any object to observe light incident on the upper part of the colony, and the plurality of lower photosynthetic effective radiation sensors may be installed at least one time the distance between crops. It can be installed at intervals of up to twice or less.

The plurality of five lower photosynthetic effective radiation sensors may be installed between rows of crops at intervals of 4/3 of the distance between crops.

If the precipitation at the observation site is more than a predetermined precipitation amount, the processor may calculate the light extinction ratio by excluding the light amounts of the photosynthetic effective radiation sensors from immediately after precipitation until a predetermined time has elapsed.

If the light amount of any one of the plurality of lower photosynthetic effective radiation sensors is less than a predetermined light amount, the processor may not calculate the light extinction ratio for the light amounts of the corresponding photosynthetic effective radiation sensors.

The processor may calculate the light extinction ratio for data corresponding to the light amount of the upper photosynthetic effective radiation sensor being 10 μmol·m ^-2 ·s ^-1 or more and 100 μmol·m ^-2 ·s ^-1 or less.

The processor may calculate the standard deviation of the light amounts of the lower photosynthetic effective radiation sensors, and calculate the light extinction ratio for data whose calculated standard deviation is 3 μmol·m ^-2 ·s ^-1 or less.

The processor receives the light amounts of the photosynthetic effective radiation sensors at predetermined intervals, calculates an average value by averaging the light amounts of the lower photosynthetic effective radiation sensors, and divides the average value by the light amount of the upper photosynthetic effective radiation sensor to The optical extinction ratio can be calculated.

The processor may calculate the light extinction ratio for one day using the light extinction ratio calculated per predetermined interval.

The crop growth monitoring method according to another embodiment of the present disclosure includes an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation amount at the top of the colony, and a plurality of lower sensors installed at the bottom of the colony to measure the effective photosynthetic radiation amount at the bottom of the colony. providing photosynthetically effective radiation sensors; And calculating the light extinction ratio using the upper amount of light incident on the upper photosynthetic effective radiation sensor and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors, thereby achieving the above-described purpose.

According to the present disclosure, the growth of field crops can be automatically continued and continuously monitored using the light extinction ratio.

According to the present disclosure, an algorithm for calculating the optical extinction ratio of measurement data is established, making it possible to obtain quantified values. As a result, a highly accurate light extinction ratio can be calculated without depending on the observer's skill level.

According to the present disclosure, there is no need for a large structure when installing a sensor for observing the light extinction ratio, so anyone can easily and conveniently install and remove the sensor, increasing the possibility of its use in farming activities where the use of agricultural machinery for soil work, etc. is essential. You can.

1 is a block diagram of a crop growth monitoring system according to an embodiment of the present disclosure.
Figure 2 is a diagram illustrating the installation of photosynthetic effective radiation sensors for calculating the light extinction ratio.
Figure 3 is a diagram illustrating the results of calculating the light extinction ratio using data measuring light reaching the outside and bottom of the colony of PAR sensors installed in a garlic colony.
Figure 4 is a diagram illustrating the results of calculating the light extinction ratio using data measuring light reaching the outside and bottom of the colony of PAR sensors installed in a corn colony.
Figure 5 is an exemplary graph showing the relationship between the PAR light extinction ratio of garlic and LAI.
Figure 6 is an exemplary graph showing the relationship between the PAR light extinction ratio of corn and LAI.
Figure 7 is an exemplary graph showing the relationship between PAR light extinction ratio and NDVI of garlic colonies.
FIG. 8 is a flowchart of a crop growth monitoring method according to another embodiment of the present disclosure.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Meanwhile, in each step, unless a specific order is clearly stated in the context, each step may occur in a different order from the specified order. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

Embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments provided below or the specific description of these embodiments.

All technical terms and scientific terms used in this disclosure, unless otherwise defined, have meanings commonly understood by those skilled in the art to which this disclosure pertains. All terms used in this disclosure are selected for the purpose of more clearly explaining this disclosure and are not selected to limit the scope of rights according to this disclosure.

Expressions such as “comprising,” “comprising,” “having,” and the like used in the present disclosure are open terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence containing the expression. It should be understood as (open-ended terms).

The singular forms described in this disclosure may include plural forms unless otherwise stated, and this also applies to the singular forms recited in the claims.

Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings.

Additionally, in the description of the following embodiments, overlapping descriptions of identical or corresponding components may be omitted. However, even if descriptions of components are omitted, it is not intended that such components are not included in any embodiment.

FIG. 1 is a block diagram of a crop growth monitoring system according to an embodiment of the present disclosure, and FIG. 2 is a diagram illustrating the installation of photosynthetic effective radiation sensors for calculating light extinction ratio.

As shown in FIG. 1, the crop growth monitoring system 100 includes a photosynthetic effective radiation measurement unit 110, a precipitation acquisition unit 120, a storage unit 130, and a processor 140.

The photosynthetic effective radiation measurement unit 110 includes an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation at the top of the colony and a plurality of lower photosynthetic effective radiation sensors installed at the bottom of the colony to measure the effective photosynthetic radiation at the bottom of the colony. Equipped with

The range of light that causes photosynthesis is 400 to 700 nm, and the sum of the light in this range is called the effective photosynthetic radiation. The photosynthetic effective radiation sensor is a sensor that can measure the photosynthetic effective radiation amount, which is micromoles of protons per square meter, and the unit is μmol·m ^-2 ·s ^-1 .

The upper photosynthetic effective radiation sensor may be installed outside the colony to observe the light incident on the upper portion of the colony, where it can be estimated to be equal to the amount of light reaching the upper portion of the colony so as not to be affected by the shadow of any object. Generally, in order to measure the light incident on the upper part of the colony, the sensor must be installed at a location higher than the maximum plant height of the crop. However, this installation is difficult to actually apply to farming activities because it requires installing a structure larger than the maximum plant height of the crop. Therefore, it is possible to measure the light incident on the top of the colony by installing a top photosynthetic effective radiation sensor outside the colony, for example outside the field, where it will not be affected by shadows from crops or other objects, in a way that does not require structures larger than the crops. there is. This installation of the upper photosynthetic effective radiation sensor for calculating the light extinction ratio is exemplarily shown on the left side of FIG. 2(a).

A plurality of lower photosynthetic effective radiation sensors may be installed at intervals of more than 1 to 2 times the distance between crops. Specifically, a plurality of lower photosynthetic effective radiation sensors may be installed in the middle between rows of crops, five at intervals of 4/3 of the distance between crops, at the bottom of the colony to measure light reaching the bottom of the colony. If more lower photosynthetic effective radiation sensors are installed at the bottom of the colony, the amount of light can be measured more accurately, and the fewer lower photosynthetic effective radiation sensors installed at the lower part of the colony, the better economically. However, in order to increase statistical significance, in this embodiment, five lower photosynthetic effective radiation sensors were selected and installed at 4/3 intervals to measure all the light reaching next to the crops and between the crops. This installation of lower photosynthetic effective radiation sensors for calculating the light extinction ratio is exemplarily shown on the right side of (a), (b), and (c) of FIG. 2.

The precipitation acquisition unit 120 acquires the amount of precipitation falling at the observation area. Precipitation can be obtained from a sensor capable of detecting precipitation installed at an observation site. In this case, precipitation data or information on the presence or absence of precipitation may be provided to the precipitation acquisition unit 120. In addition, precipitation data acquired by the precipitation acquisition unit 120 can be obtained from observation data of the corresponding observation area provided by the Korea Meteorological Administration.

The storage unit 130 stores the upper light amount incident on the upper photosynthetic effective radiation sensor and the respective light amount of the lower light amount reaching the plurality of lower photosynthetic effective radiation sensors. The storage unit 130 may also store precipitation data acquired by the precipitation acquisition unit 120.

The processor 140 receives the upper light amount incident on the upper photosynthetic effective radiation sensor and the lower light amount that reaches the plurality of lower photosynthetic effective radiation sensors at predetermined intervals, that is, at a period, and stores them in the storage unit 130. Since light is a value that changes from moment to moment, it is necessary to set the collection interval of the photosynthetic effective radiation sensor installed to measure the light incident on the upper part of the colony and the light reaching the lower part of the colony to obtain as much change in light amount as possible. In this embodiment, the data logger's recording interval is set to 1 minute.

The processor 140 calculates the light extinction ratio using the upper amount of light incident on the upper photosynthetic effective radiation sensor stored in the storage unit 130 and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors.

In addition to these upper and lower light quantities, the processor 140 may further use precipitation data to calculate the light extinction ratio. If, while calculating the light extinction ratio, it is confirmed that the precipitation in the observation area was more than a predetermined amount of precipitation, the processor 140 may calculate the light extinction ratio by excluding the amount of light from the photosynthetic effective radiation sensors from immediately after the precipitation until a predetermined time has passed. As a result, it is possible to reduce the error in the light extinction ratio that may occur when an accurate photosynthetic effective radiation amount cannot be obtained due to water droplets forming on the photosynthetic effective radiation sensor. In the example of this disclosure, if the amount of precipitation is 0.1 mm or more, the amount of light from immediately after the precipitation until 30 minutes later is excluded.

The processor 140 may also exclude from calculating the light extinction ratio if the light amount of any one of the lower photosynthetic effective radiation sensors is less than a predetermined threshold. For example, if the light amount of any one of the lower photosynthetic effective radiation sensors is less than 0.1 μmol·m ^-2 ·s ^-1 , it can be excluded from the light extinction ratio calculation. If the light quantity of any one of the lower photosynthetic effective radiation sensors includes 0μmol·m ^-2 ·s ^-1 , an error may occur in calculating the light extinction ratio, so the light amount of all clusters of the lower photosynthetic effective radiation sensors is 0μmol·m. The light extinction ratio can be calculated for data other than ^-2 ·s ^-1 . in this case. The processor 140 first stores the light amount of all photosynthetic effective radiation sensors according to the data logger in the storage unit 130, and later excludes it when calculating the light extinction ratio, or uses the value of one of the photosynthetic effective radiation sensors at the bottom when data logging. Even if it is below a predetermined threshold, it may not be stored in the storage unit 130.

The processor 140 may also use the data corresponding to the light amount of the upper photosynthetic effective radiation sensor to be 10 μmol·m ^-2 ·s ^-1 or more and 100 μmol·m ^-2 ·s ^-1 or less to calculate the light extinction ratio. The reason less than 10μmol·m ^-2 ·s ^-1 is not used here is because the uncertainty in calculating the light extinction ratio may increase when the amount of light incident on the upper photosynthetic effective radiation sensor is small. The reason for not using more than 100μmol·m ^-2 ·s ^-1 is because as the amount of light increases, the ratio of direct light increases, and there is a possibility that light may be distributed unevenly in the space inside the colony.

The processor 140 also calculates the standard deviation of the light amounts of the lower photosynthetic effective radiation sensors collected at predetermined intervals, and calculates the standard deviation of the light for data corresponding to 3 μmol·m ^-2 ·s ^-1 or less. It can be used to calculate extinction ratio. As the standard deviation increases, the difference in the amount of light reaching the lower photosynthetic effective radiation sensors increases, which means that the ratio of direct light penetrating into the colony is higher than that of scattered light. When the proportion of direct light is high, any part of the colony may be overestimated or underestimated, so data from time periods with a high proportion of scattered light should be used to calculate the light extinction ratio of the crop. Accordingly, the processor 140 may calculate the light extinction ratio using light quantity data when the standard deviation of the light quantities of the lower photosynthetic effective radiation sensors is small.

The processor 140 calculates the average value of the five light amounts of the lower photosynthetic effective radiation sensors at a predetermined interval of the data logger, for example, every minute. The processor 140 then calculates the light extinction ratio per minute by dividing the average value of the lower photosynthetic effective radiation light amount by the light amount of the upper photosynthetic effective radiation sensor.

Processor 140 calculates the daily light extinction ratio. The daily light extinction ratio is the average of the light extinction ratio per minute for the entire day. When calculating the daily light extinction ratio, the processor 140 calculates the light extinction ratio per minute because, if the calculated number of light extinction ratios is less than a predetermined number, abnormal values that are not filtered out in the calculation process may be included, which may greatly affect the light extinction ratio. The daily light extinction ratio can be calculated only when the number is more than a certain number.

The light extinction ratio is the ratio (I _b /Io) of the light (I _b ) incident on the crop colony that is reflected, absorbed, and transmitted, and finally reaches the lowest layer of vegetation. As the biomass of the crop increases, the leaves become more exposed to it. As the amount of light reflected and absorbed increases and the amount of light transmitted decreases, the light extinction ratio decreases. In other words, a decrease in the light extinction ratio means an increase in biomass.

Example

1. Calculation of garlic colony photoextinction ratio

Figure 3 is a diagram illustrating the results of calculating the light extinction ratio using data measuring light reaching the outside and bottom of the colony of PAR sensors installed in a garlic colony. Garlic is sown in October, goes through a growth stasis period during the winter, and begins to grow the following spring as temperatures rise. In calculating the light extinction ratio of garlic, it can be seen that the value remains constant during the winter, which can be seen as growth stopping and the leaves not elongating. Then, in the spring, the light extinction ratio decreases rapidly, which can be seen as an increase in biomass as growth progresses.

2. Calculation of corn colony light extinction ratio

Figure 4 is a diagram illustrating the results of calculating the light extinction ratio using data measuring light reaching the outside and bottom of the colony of PAR sensors installed in a corn colony. If you look at the PAR light extinction ratio calculation graph, you can see that the value decreases as corn growth progresses.

3. Correlation between garlic colony light extinction ratio and LAI

Figure 5 is an exemplary graph showing the relationship between the PAR light extinction ratio of garlic and LAI. For the two parameters, it can be seen that the PAR light extinction ratio decreases exponentially as LAI increases, regardless of crop variety or cultivation year. Therefore, by using the PAR light extinction ratio, LAI, which is difficult to observe continuously, can be estimated.

4. Correlation between corn colony light extinction ratio and LAI

Figure 6 is an exemplary graph showing the relationship between the PAR light extinction ratio of corn and LAI. It can be seen that the PAR light extinction ratio decreases exponentially as LAI increases, regardless of the two parameters, regardless of the fertilization treatment of corn. Therefore, by using the PAR light extinction ratio, LAI, which is difficult to observe continuously, can be estimated.

5. Correlation between garlic colony PAR light extinction ratio and NDVI

Figure 7 is an exemplary graph showing the relationship between PAR light extinction ratio and NDVI of garlic colonies. It can be seen that the PAR light extinction ratio linearly decreases as NDVI increases during the garlic clove differentiation period. Therefore, NDVI, which can be obtained only by using a structure larger than the maximum plant height of the crop, can be estimated using the light extinction ratio, which can be calculated in a relatively easy-to-install method.

Through Figures 5 to 7 above, it can be seen that the PAR light extinction ratio is correlated with LAI and NDVI, which are representative growth parameters. As a result, PAR light extinction ratio has the potential to be used as a crop growth parameter to continuously monitor crop growth.

FIG. 8 is a flowchart of a crop growth monitoring method according to another embodiment of the present disclosure.

The photosynthetic effective radiation measurement unit 110 includes an upper photosynthetically active radiation sensor (Photosynthetically Active Radiation: PAR) installed to measure the photosynthetic effective radiation amount at the top of the colony, and a plurality of sensors installed at the bottom of the colony to measure the photosynthetic effective radiation amount at the bottom of the colony. It is provided with photosynthetic effective radiation sensors at the bottom (S810). The upper photosynthetic effective radiation sensor may be installed outside the colony to observe the light incident on the upper portion of the colony, where it can be estimated to be equal to the amount of light reaching the upper portion of the colony so as not to be affected by the shadow of any object. A plurality of lower photosynthetic effective radiation sensors may be installed at intervals of more than 1 to 2 times the distance between crops. Specifically, a plurality of lower photosynthetic effective radiation sensors may be installed in the middle between rows of crops, five at intervals of 4/3 of the distance between crops, at the bottom of the colony to measure light reaching the bottom of the colony.

The processor 140 receives the upper light amount incident on the upper photosynthetic effective radiation sensor and the lower light amount that reaches the plurality of lower photosynthetic effective radiation sensors at predetermined intervals, that is, input (S820). In this embodiment, the data logger's recording interval is set to 1 minute.

The processor 140 calculates the light extinction ratio at predetermined intervals using the upper amount of light incident on the upper photosynthetic effective radiation sensor stored in the storage unit 130 and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors (S830) .

Specifically, the processor 140 may further use precipitation data to calculate the light extinction ratio in addition to these upper and lower light quantities. If, while calculating the light extinction ratio, it is confirmed that the precipitation in the observation area was more than a predetermined amount of precipitation, the processor 140 may calculate the light extinction ratio by excluding the amount of light from the photosynthetic effective radiation sensors from immediately after the precipitation until a predetermined time has passed.

The processor 140 may also exclude from calculating the light extinction ratio if the light amount of any one of the lower photosynthetic effective radiation sensors is less than a predetermined threshold. For example, if the light amount of any one of the lower photosynthetic effective radiation sensors is less than 0.1 μmol·m ^-2 ·s ^-1 , it can be excluded from the light extinction ratio calculation. If the light quantity of any one of the lower photosynthetic effective radiation sensors includes 0μmol·m ^-2 ·s ^-1 , an error may occur in calculating the light extinction ratio, so the light amount of all clusters of the lower photosynthetic effective radiation sensors is 0μmol·m. The light extinction ratio can be calculated for data other than ^-2 ·s ^-1 .

The processor 140 may also use the data corresponding to the light amount of the upper photosynthetic effective radiation sensor to be 10 μmol·m ^-2 ·s ^-1 or more and 100 μmol·m ^-2 ·s ^-1 or less to calculate the light extinction ratio. The processor 140 also calculates the standard deviation of the light amounts of the lower photosynthetic effective radiation sensors collected at predetermined intervals, and calculates the standard deviation of the light for data corresponding to 3 μmol·m ^-2 ·s ^-1 or less. It can be used to calculate extinction ratio.

The processor 140 calculates the average value of the five light quantities of the lower photosynthetic effective radiation sensors at predetermined intervals of the data logger, for example, every minute. The processor 140 may then calculate the light extinction ratio per minute by dividing the average value of the lower photosynthetic effective radiation light amount by the light amount of the upper photosynthetic effective radiation sensor.

The processor 140 calculates the daily light extinction ratio (S840). The daily light extinction ratio is the average of the light extinction ratio per minute for the entire day. When calculating the daily light extinction ratio, the processor 140 calculates the light extinction ratio per minute because, if the calculated number of light extinction ratios is less than a predetermined number, abnormal values that are not filtered out in the calculation process may be included, which may greatly affect the light extinction ratio. The daily light extinction ratio can be calculated only when the number is more than a certain number.

So far, the present invention has been examined focusing on its preferred embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Accordingly, the scope of the present invention is not limited to the above-described embodiments, but should be interpreted to include various embodiments within the scope equivalent to the content described in the patent claims.

100: Crop growth monitoring system 110: Photosynthetic effective radiation measurement unit
120: Precipitation acquisition unit 130: Storage unit
140: processor

Claims (18)

A photosynthetic effective radiation measurement unit including an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation at the top of the colony and a plurality of lower photosynthetic effective radiation sensors installed at the bottom of the colony to measure the effective photosynthetic radiation at the bottom of the colony; and
A processor that calculates a light extinction ratio using the upper amount of light incident on the upper photosynthetic effective radiation sensor and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors,
If the light amount of any one of the plurality of lower photosynthetic effective radiation sensors is less than a predetermined light amount, the processor does not calculate the light extinction ratio for the light amounts of the corresponding photosynthetic effective radiation sensors,
The processor calculates the light extinction ratio for data corresponding to a light quantity of the upper photosynthetic effective radiation sensor of 10 μmol·m ^-2 ·s ^-1 or more and 100 μmol·m ^-2 ·s ^-1 or less,
The processor calculates the standard deviation of the light amounts of the lower photosynthetic effective radiation sensors, and calculates the light extinction ratio for data whose calculated standard deviation is 3 μmol·m ^-2 ·s ^-1 or less,
The processor receives the light amounts of the photosynthetic effective radiation sensors at predetermined intervals, calculates an average value by averaging the light amounts of the lower photosynthetic effective radiation sensors, and divides the average value by the light amount of the upper photosynthetic effective radiation sensor to Calculate the light extinction ratio, but only when the number of light extinction ratios calculated per predetermined interval is n or more (where n is a natural number at least greater than 2). The daily average value of the light extinction ratio calculated per predetermined interval is the daily light extinction ratio. to calculate
A crop growth monitoring system characterized by: According to paragraph 1,
The upper photosynthetic effective radiation sensor is installed outside the colony unaffected by the shadow of any object to observe the light incident on the upper portion of the colony,
A crop growth monitoring system, characterized in that the plurality of lower photosynthetic effective radiation sensors are installed at intervals of 1 to 2 times the distance between crops. According to paragraph 2,
A crop growth monitoring system, characterized in that the plurality of lower photosynthetic effective radiation sensors are five and are installed between rows of crops at intervals of 4/3 of the distance between crops. According to any one of claims 1 to 3,
The processor is a crop growth monitoring system characterized in that, if the precipitation at the observation site is more than a predetermined precipitation amount, the light intensity of the photosynthetic effective radiation sensors is excluded from immediately after precipitation until a predetermined time has elapsed and the light extinction ratio is calculated. delete delete delete delete delete Providing an upper photosynthetic effective radiation sensor installed to measure the effective photosynthetic radiation at the top of the colony and a plurality of lower photosynthetic effective radiation sensors installed at the lower part of the colony to measure the effective photosynthetic radiation at the lower part of the colony; and
Comprising the step of calculating a light extinction ratio using the upper amount of light incident on the upper photosynthetic effective radiation sensor and the lower amount of light reaching the plurality of lower photosynthetic effective radiation sensors,
In the calculating step, if the light amount of any one of the plurality of lower photosynthetic effective radiation sensors is less than a predetermined light amount, the light extinction ratio is not calculated for the light amounts of the corresponding photosynthetic effective radiation sensors,
In the calculating step, the light extinction ratio is calculated for data corresponding to the light amount of the upper photosynthetic effective radiation sensor being 10 μmol·m ^-2 ·s ^-1 or more and 100 μmol·m ^-2 ·s ^-1 or less,
The calculating step calculates the standard deviation of the light amounts of the lower photosynthetic effective radiation sensors, and calculates the light extinction ratio for data whose calculated standard deviation is 3 μmol·m ^-2 ·s ^-1 or less,
The calculating step involves receiving the light amounts of the photosynthetic effective radiation sensors at predetermined intervals, calculating an average value by averaging the light amounts of the lower photosynthetic effective radiation sensors, and dividing the average value by the light amount of the upper photosynthetic effective radiation sensor at predetermined intervals. The light extinction ratio is calculated per day, but only when the number of light extinction ratios calculated per predetermined interval is n or more (where n is a natural number at least greater than 2). Calculating the light extinction ratio
A method for monitoring crop growth, characterized in that. According to clause 10,
The upper photosynthetic effective radiation sensor is installed outside the colony unaffected by the shadow of any object to observe the light incident on the upper portion of the colony,
A crop growth monitoring method, characterized in that the plurality of lower photosynthetic effective radiation sensors are installed at intervals of 1 to 2 times the distance between crops. According to clause 11,
A crop growth monitoring method, characterized in that the plurality of lower photosynthetic effective radiation sensors are five and are installed between rows of crops at intervals of 4/3 of the distance between crops. According to any one of claims 10 to 12,
In the calculating step, if the precipitation at the observation site is more than a predetermined precipitation amount, the light amount of the photosynthetic effective radiation sensors is excluded from immediately after precipitation until a predetermined time has elapsed, and the light extinction ratio is calculated. A method for monitoring crop growth, characterized in that. delete delete delete delete delete

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