JP5690173B2 - Fertilization control device and fertilization control program - Google Patents

Description

  The present invention relates to a fertilization control device and a fertilization control program for managing fertilization in hydroponics.

  Hydroponics is a cultivation method that does not use soil for cultivating crops with nutrient solutions containing fertilizer components. As fertilizer management methods for applying fertilizer to this nutrient solution, there are roughly two methods: a concentration management method and a quantitative management method. The concentration management method is the most common management method for managing the amount of fertilizer applied by the concentration of fertilizer components in the nutrient solution. Here, the following [Patent Document 1] discloses an invention related to a nutrient solution cultivation apparatus that manages a plurality of nutrient solution cultivation tanks by a concentration management method.

  In addition, the quantitative management method applies fertilizer components in the required amount, and differs from the concentration management method in which all fertilizer components are always contained in the nutrient solution at a certain concentration, depending on the growing state of the crop. The amount of fertilization can be controlled more actively. For this reason, compared to the concentration management method, it is easier to control the growth of crops, and it is a management method that can be expected to increase the yield, improve the quality, and reduce costs by saving fertilizer. The quantitative management method can be divided into a method of quantitatively managing all the fertilizer components and a dispensing method of quantitatively managing only a part of the fertilizer components. In the latter dispensing method, other fertilizer components that are not quantitatively managed are generally managed by the concentration management method. For this reason, the dispensing method can be said to be a complex fertilization management method in which a quantitative management method and a concentration management method are mixed. The fertilization amount here includes not only the amount of fertilizer in quantitative management but also the concentration of fertilizer in concentration management.

JP-A-11-75586

  Whether it is the quantitative management method or the concentration management method described above, it is basically preferable to increase the amount of fertilization according to the growth of the crop until a certain growth stage. However, changing the fertilizer amount each time according to the growth state of the crop is a complicated operation.

  This invention is made | formed in view of the said situation, and it aims at providing the fertilization control apparatus and fertilization control program which can perform the management of the fertilization amount according to the growth state of a crop simply and appropriately. .

The present invention
(1) In the fertilization control apparatus 50 which manages the fertilization to the hydroponic cultivation tank 10,
The crop is tomatoes,
Fertilization and data sequence D composed of a plurality of steps corresponding to the number of days the growth index of the crop 1 from the date of planting the crop 1 to hydroponics tank 10,
An input capable of inputting section 34 and the vigor information indicating the state of growth assisting information and the crop 1 foliage showing a state of growth of the crop 1,
A fertilization amount setting unit 36 that sets the fertilization amount of the day based on the fertilization amount data string D;
When the bunches of the crop 1 are first-stage florets, second-stage florets,... N-th stage florets in order from the root side, the growth assist information is information indicating that the n-th stage florets have opened or harvested. Information indicating the start ,
The fertilizer amount setting unit 36, with reference to set the amount of fertilizer and fertilizer amount data of steps corresponding to the number of days elapsed when growth assisting information is not input, and the growth assisting information if the growth assisting information is input The process moves to the step where the growth index matches and sets the fertilizer amount by referring to the fertilizer amount data, and then sets the fertilizer amount by referring to the fertilizer amount data by the number of days elapsed from the transitioned step. The fertilizer amount data referred to when the fertility information is input is corrected based on the grass vigor information to set the fertilizer amount, and after the information indicating the start of harvesting is input to the growth assist information, the upper limit fertilizer is applied. The above problem is solved by providing a fertilization control device 50 characterized by performing proportional application according to the absorption transpiration amount of the nutrient solution within the range of the amount .
( 2 ) In the fertilization control program which manages the fertilization to the hydroponic cultivation tank 10,
Crop 1 is tomatoes,
Based on the constructed Fertilization data string D in a plurality of steps corresponding to the number of days the growth index of the crop 1 from the date of planting the crop 1 to hydroponics tank 10, setting the amount of fertilizer of the day And the steps to
When the bunches of the crop 1 are first-stage florets, second-stage florets,.
When the growth assist information indicating that the n-th inflorescence indicating the growth state of the crop 1 has flowered or the growth assist information indicating the start of harvesting is not input, refer to the fertilization amount data in the step corresponding to the elapsed days set the amount of fertilizer applied, together with the growth assisting information is set with reference to fertilization and fertilization amount data and proceeds to step in which the growth assisting information and the growth index matches when entered, then migrated The fertilization amount is set by referring to the fertilization amount data by the number of days elapsed from the step, and further, based on the fertilization amount data referred to when the planting information indicating the state of the foliage of the crop 1 is input, After applying correction, the fertilizer amount was set, and after the information indicating the start of harvesting was input to the growth assist information, the amount of nutrient solution absorbed transpiration was within the upper fertilizer amount range. And procedures to carry out also an example application,
The above-mentioned problem is solved by providing a fertilization control program characterized by causing a computer to execute.

  According to the present invention, the amount of fertilizer applied in hydroponics can be managed simply and appropriately.

It is a block diagram of a fertilization control device concerning the present invention. It is a figure which shows the example of the fertilization amount data sequence which concerns on this invention. It is a figure which shows the example of the time range of proportional application which concerns on this invention.

  A fertilization control device and a fertilization control program according to the present invention will be described with reference to the drawings. A fertilization control device 50 according to the present invention shown in FIG. 1 constitutes a part of a nutrient solution cultivation system 100 for nutrient-cultivating a crop 1 and manages the amount of fertilization in the nutrient solution supplied to the nutrient solution cultivation tank 10. Is. And the fertilization control apparatus 50 respond | corresponds to the counter part 30 which counts the elapsed days after planting the crop 1 to the hydroponics tank 10, the elapsed days from the planting date of the crop 1, and the growth index of the crop 1 The fertilization amount data string D that is composed of a plurality of steps and serves as a basis for setting the fertilization amount for the day, the recording unit 32 such as a hard disk or semiconductor memory in which the fertilization amount data string D is recorded, and the growth of the crop 1 An input unit 34 capable of inputting growth assist information and other information indicating the state, device settings, and the like, a fertilization amount setting unit 36 that sets a fertilization amount for the day based on the fertilization amount data string D, and a fertilization amount setting unit The fertilization control part 38 which prepares the nutrient solution of the fertilizer amount according to the setting of 36, and supplies it to the nutrient solution cultivation tank 10, the pH control part 60 which controls the pH of a nutrient solution within the predetermined range, and the solution of nutrient solution Temperature that controls the temperature within a specified range It has a control unit 70, a. In addition, since the nutrient solution circulates through the nutrient solution cultivation tank 10 and the nutrient solution preparation tank 20, fertilization here refers to introducing a fertilizer component into the nutrient solution in the nutrient solution preparation tank 20.

  Next, the operation of the fertilization control device 50 and the fertilization control program according to the present invention will be described together with the operation of each part of the hydroponic cultivation system 100. In addition, while the nutrient solution cultivation system 100 shown in FIG. 1 returns the excess nutrient solution of the nutrient solution cultivation tank 10 to the nutrient solution preparation tank 20, some fertilizer components, for example, a nitrogen component, are quantitatively managed. The example of the dispensing method which controls density | concentration of the fertilizer component of is shown. Of course, the fertilization control device 50 and the fertilization control program according to the present invention are not limited to this configuration. For example, a system for quantitatively managing all fertilizer components, a system for managing concentration of all fertilizer components, surplus It can also be applied to a pouring system that drains various nutrient solutions.

  First, fertilizer components and irrigation water (such as tap water, well water, and agricultural water) that are quantitatively managed are introduced into the first fertilizer undiluted tank 22 to prepare a fertilizer undiluted solution a having a predetermined concentration. Next, the operator inputs the concentration information of the fertilizer stock solution a into the fertilization control device 50 using the input unit 34. As the input unit 34, known input means such as a touch panel or a numeric keypad can be used. The fertilization control device 50 records the input concentration information in an internal memory or the like. In addition, when there are a plurality of fertilizer components to be quantitatively managed, a fertilizer stock solution tank is basically provided for each fertilizer component, and a fertilizer stock solution of each fertilizer component is individually prepared in each fertilizer stock solution tank. Then, the concentration information of each fertilizer stock solution is recorded in an internal memory or the like.

  In addition, water and a plurality of fertilizer components whose concentrations are to be controlled are introduced into the second fertilizer stock solution tank 23 at an appropriate ratio to prepare a fertilizer stock solution b in which the plurality of fertilizer components are mixed at a predetermined ratio. In addition, when preparing the fertilizer stock solution b for density | concentration management divided into several, you may install two or more 2nd fertilizer stock solution tanks 23. FIG.

  Next, the operator places a predetermined number of plants 1 (seedlings) in the hydroponic tank 10. The nutrient solution cultivation tank 10 is covered with a light-shielding lid 12 to prevent evaporation of the nutrient solution in the nutrient solution cultivation tank 10. Moreover, although the example which grows the crop 1 only with a nutrient solution is shown in FIG. 1, you may cultivate the nutrient solution culture tank 10 by laying organic culture media, rock wool, etc., such as an insulator and peat moss. . Next, the operator inputs the total number of cultivated strains, which is the total number of the planted crops 1, into the fertilization control device 50. The fertilizer application control device 50 records the input total number of cultivated strains in an internal memory or the like. Next, the worker inputs to the fertilization control device 50 that the plant 1 has been planted in the hydroponics tank 10. Thereby, the counter unit 30 starts counting elapsed days.

  On the next day, the counter unit 30 sets the elapsed days as one day. When the elapsed days of the counter unit 30 change, the fertilization amount setting unit 36 of the fertilization control device 50 refers to the fertilization amount data of the step corresponding to the elapsed days from the fertilization amount data string D recorded in the recording unit 32. . Here, since the number of days elapsed is one day, the step number corresponding to the number of days elapsed is No. Refer to 1 fertilizer application data.

Here, an example of the fertilizer application amount data string D recorded in the recording unit 32 is shown in FIG. Of the fertilization amount data string D shown in FIG. In addition, row B shows the growth index of crop 1. This growth indicators, tomatoes, namely tomatoes of each variety (Ootama tomatoes, Nakatama tomato), and a growth index of mini tomatoes. In tomatoes, the first inflorescence is usually applied after 7 to 8 leaves are attached, and thereafter, the second and third inflorescences are successively attached every approximately 3 leaves. And it blooms from the first inflorescence in order and bears fruit. In tomatoes, the flowering of this inflorescence or the fruit that bears fruit on the inflorescence is the most suitable growth index for managing the amount of fertilization. Thus, tomato first stage in order from the base side of the flower clusters of the growth indicators crop 1 of the B column in such Hanabusa, the second stage Hanabusa, ... counted as the n-th stage Hanabusa, and what stage of the flower clusters open flower Taka denote the. In the example of FIG. 2, when the row B is “0”, it indicates that the first floret is not flowering, and when it is “1”, the first floret is flowering. In addition, although the judgment of the flowering of the flower bunches may be made when the flower buds are generally flowered, it is preferable that the flower buds are flowered.

  The C column of the fertilizer application data column D is the fertilizer application amount per crop of the fertilizer component to be quantitatively managed. This fertilizer application amount is obtained in advance by a cultivation test. In addition, when there are a plurality of fertilizer components to be quantitatively managed, the column C increases accordingly.

  The D column of the fertilizer application data column D indicates the set concentration of the fertilizer component whose concentration is managed. This row D need not be particularly provided when all fertilizer components are quantitatively managed or when the set concentration is fixed over the entire cultivation period. The concentration management of the fertilizer component is generally performed based on the electrical conductivity (EC value) of the nutrient solution that changes with increase or decrease of the fertilizer concentration. Therefore, the numerical value of D column of fertilizer application amount data column D has shown EC value (mS / cm: milli Siemens per centimeter) of the target nutrient solution.

  Further, the E column of the fertilization amount data column D is a fertilization amount per crop at the time of proportional application described later. In the case where there are a plurality of fertilizer components that are quantitatively managed, this E column also increases by that amount. The fertilization amount data at the time of proportional application is not necessarily described in the fertilization amount data string D, and may be divided and set in a fertilization amount data string dedicated to proportional application. According to this structure, the data amount of the fertilization amount data sequence D can be reduced.

  Next, the fertilizer application amount setting unit 36 refers to the step No. referred to. Based on the fertilization amount data of 1, the fertilization amount of quantitative management fertilization on the first day of the passage is set to 2 mg / strain, and the fertilization amount of concentration management fertilization is set to an EC value of 0.8. Then, these set values are output to the fertilization control unit 38. The fertilizer application control unit 38 performs fertilization according to the setting of the fertilizer application amount setting unit 36, and prepares the nutrient solution of the set fertilizer amount in the nutrient solution preparation tank 20. The quantitative management fertilization is performed at a preset time such as a sunrise time. Therefore, normally, concentration management fertilization is performed first. The concentration management fertilization by the fertilization control unit 38 is performed as follows, for example.

  First, when the nutrient solution in the nutrient solution preparation tank 20 does not satisfy the minimum water level, the fertilizer application control unit 38 opens the electromagnetic valve 40 of the irrigation pipe and supplements the nutrient solution preparation tank 20 with the supply water. A water level gauge 24 is installed in the nutrient solution preparation tank 20, and the fertilizer application control unit 38 can recognize the amount of nutrient solution in the nutrient solution preparation tank 20 from the water level gauge 24. When the electromagnetic valve 40 is opened and water is supplemented to the nutrient solution preparation tank 20, the level of the nutrient solution rises. And if the water level gauge 24 shows that the water level of the nutrient solution satisfy | filled the regulation water level, the fertilizer application control part 38 will close the solenoid valve 40, and will stop water supplement. In addition, the flow meter 28 is installed in the supply pipe of the water, and the amount of water supplemented can be measured. This water replenishment amount is used during proportional fertilization described later.

  Next, the fertilizer application control unit 38 operates the liquid feed pump 23 p installed in the second fertilizer stock solution tank 23 to apply the fertilizer stock solution b for concentration management to the nutrient solution preparation tank 20. Thereby, the fertilizer density | concentration of the nutrient solution in the nutrient solution preparation tank 20 rises, and EC value of a nutrient solution also rises in connection with this. An EC sensor 26 is installed in the nutrient solution preparation tank 20 and outputs EC value information of the nutrient solution to the fertilization control unit 38 as needed. The fertilizer application control unit 38 stops the operation of the liquid feed pump 23p when the EC value of the nutrient solution reaches a set value of 0.8 based on the EC value information from the EC sensor 26. Thereby, the fertilizer concentration of the nutrient solution in the nutrient solution preparation tank 20 is adjusted to the concentration of EC value 0.8 set by the fertilizer application amount setting unit 36. In addition, a stirring means (not shown) is installed in the nutrient solution preparation tank 20, and the nutrient solution is sufficiently stirred.

  Further, a pH sensor 62 is installed in the nutrient solution preparation tank 20, and the pH value information of the nutrient solution in the nutrient solution preparation tank 20 is output to the pH control unit 60. The pH control unit 60 receives the pH value information from the pH sensor 62, and the liquid feed pump 64p of the pH adjusting liquid tank 64 containing the acidic pH adjusting liquid or the pH adjusting liquid tank 65 containing the alkaline pH adjusting liquid. The liquid feed pump 65p is appropriately operated. Thereby, an acidic or alkaline pH adjusting solution is supplied into the nutrient solution, and the pH value of the nutrient solution is controlled within an appropriate range set in advance.

  In addition, a temperature sensor 72 is installed in the nutrient solution preparation tank 20, and the temperature of the nutrient solution in the nutrient solution preparation tank 20 is output to the temperature control unit 70. The temperature control unit 70 receives information on the nutrient solution temperature from the temperature sensor 72 and, when the nutrient solution temperature is lower than a preset temperature range, causes the fluid temperature control unit 74 to perform a heating operation. Thereby, warm water circulates in the heat exchanger 76 installed in the nutrient solution preparation tank 20, and the nutrient solution is heated. Further, when the nutrient solution temperature is higher than a preset temperature range, the temperature control unit 70 causes the solution temperature control unit 74 to perform a cooling operation. Thereby, cold water circulates through the heat exchanger 76 and the nutrient solution is cooled. The pH management by the pH control unit 60 and the liquid temperature management by the temperature control unit 70 are basically continued during the operation of the fertilization control device 50.

  Moreover, the fertilization control part 38 operates the nutrient solution pump 20p, and supplies the nutrient solution in the nutrient solution preparation tank 20 to the nutrient solution cultivation tank 10 intermittently. In addition, the hydroponic cultivation tank 10 may be plural. The supply of the nutrient solution to the nutrient solution cultivation tank 10 is continuously performed during the cultivation period of the crop 1 regardless of day or night when the nutrient solution cultivation tank 10 is only the nutrient solution. Moreover, when the culture medium is spread in the hydroponic cultivation tank 10, it is normally performed during the daytime. And when an excessive nutrient solution arises in the nutrient solution cultivation tank 10, this excess nutrient solution returns to the nutrient solution preparation tank 20 through the reflux channel R.

  When the amount of the nutrient solution decreases due to supply to the nutrient solution cultivation tank 10 or absorption transpiration by the crop 1, the water level in the nutrient solution preparation tank 20 decreases. And if the water level of a nutrient solution falls below the minimum water level, the fertilizer application control part 38 will open the electromagnetic valve 40, and will replenish water with the water until the water level of a nutrient solution will become a regulation water level. Then, concentration management fertilization by the fertilization control unit 38, pH management by the pH control unit 60, and liquid temperature management by the temperature control unit 70 are performed.

Next, the quantitative management fertilization by the fertilization control unit 38 will be described. First, the fertilization control unit 38 calculates the fertilization amount to be applied on the day from the fertilization amount of the quantitative management fertilization set by the fertilization amount setting unit 36 and the total number of cultivated strains of the crop 1 input previously. Next, the application amount of the fertilizer stock solution a to be supplied into the nutrient solution preparation tank 20 is calculated from the concentration information of the fertilizer stock solution a for quantitative management fertilization input previously. For example, if the total number of cultivated strains is 3000 and the concentration of the fertilizer stock solution a is 1 wt%, step No. Since the amount of fertilizer for 1 quantitative management fertilization is 2mg / strain,
The amount of fertilizer applied (g) is 0.002 × 3000 (= 6 g)
The application amount of the fertilizer stock solution a is 6 (g) /0.01 (wt%) = 600 g≈600 cc.

  Next, the fertilizer application control unit 38 operates the liquid feed pump 22p installed in the first fertilizer stock solution tank 22 at a preset time, for example, around the sunrise time, and applies the fertilizer stock solution a to the nutrient solution preparation tank 20. To do. The application amount of the fertilizer stock solution a is output to the fertilization control unit 38 by the flow meter 22q. The fertilizer application control unit 38 stops the operation of the liquid feed pump 22p when the application rate from the flow meter 22q reaches the previously calculated application rate for the day. Thereby, the fertilizer component quantitatively managed by the nutrient solution of the nutrient solution preparation tank 20 is thrown in for the application amount of the day. In addition, this quantity management fertilization may be performed all at once, or may be performed in multiple times. However, since the amount of absorption transpiration of the crop 1 decreases at night, the quantitative management fertilization is preferably completed in the morning or before about 15:00.

  This quantitative management fertilization increases the fertilizer concentration of the entire nutrient solution, and the EC value of the nutrient solution may be larger than the previously set value 0.8. However, the fertilization control unit 38 basically does not perform a dilution operation. In addition, at the timing when the water is replenished immediately after the quantitative management fertilization, the fertilizer concentration of the quantitative management fertilization and the fertilizer concentration of the concentration management fertilization are added together to control the concentration. However, this point is allowed as an error range. Moreover, in order to reduce such an error, it is good also as a structure which always performs water supplementation and concentration management fertilization before quantitative management fertilization.

  The amount of the nutrient solution prepared in the nutrient solution preparation tank 20 is appropriately set based on the daily supply amount to the nutrient solution cultivation tank 10 and the capacity of the nutrient solution cultivation tank 10, and is input to the nutrient solution preparation tank 20. Almost all of the fertilizer component of quantitative management thus applied is applied to the hydroponics tank 10 and consumed by the crop 1 during the day. In addition, although the nutrient solution preparation tank 20 does not become below the minimum water level, since the water replenishment is usually performed a plurality of times a day, the residual amount here can be ignored.

  On the next day, the counter unit 30 sets the elapsed days to 2 days. And the fertilizer application amount setting part 36 is step No. corresponding to 2 days of elapsed days from the fertilizer application data string D. With reference to the fertilizer application data of 2, quantitative management fertilization and concentration management fertilization are performed in the same manner. In this manner, the fertilization control device 50 refers to the fertilization amount data of the step corresponding to the elapsed days counted by the counter unit 30 and performs quantitative management fertilization and concentration management fertilization.

  In addition, the fertilization control apparatus 50 can input the plant vigor information of the crop 1. The planting information is input by the worker after confirming the growth status of the crop 1. When the state of the foliage of the crop 1 is stronger than usual, for example, “stress” is input. When the strength is input as the grass force information, the fertilizer application amount setting unit 36 subtracts a preset ratio from either or both of the quantitatively applied fertilizer amount and the concentration-managed fertilizer amount of the referenced fertilizer amount data. Then set the fertilizer amount. For example, a value obtained by multiplying the amount of fertilization with quantitative management by 0.85 (−15%) at the time of stress is used as the amount of fertilization with quantitative management. On the other hand, when the state of the foliage of the crop 1 is weaker than usual, for example, “weak” is input. When the weakness is input in the planting information, the fertilization amount setting unit 36 adds a ratio set in advance from either or both of the quantitative management fertilization amount and the concentration management fertilization amount of the referenced fertilization amount data. Then set the fertilizer amount. For example, a value obtained by multiplying the amount of fertilization by quantitative management by 1.30 (+ 30%) at the time of weakening is used as the amount of fertilization by quantitative management. By inputting the grass force information, the amount of fertilization can be finely adjusted, and the growth of the crop 1 can be controlled more finely. It should be noted that the correction of the fertilizer amount based on the grass force information is basically applied until the next grass force information is input or the grass force information is canceled. Further, the grass force information is not limited to three levels of strength, weakness, and release (normal), and may be further multi-staged.

  Next, it is assumed that the growth of the crop 1 has progressed and, for example, the first florets of most crops 1 have flowered on the 18th day. The operator determines the flowering and fruiting of the inflorescence. Judgment at that time is made by looking at the growth status of the entire crop 1 cultivated in the reference tree or the hydroponic tank 10. When the operator determines that the first stage inflorescence of the crop 1 has flowered, the operator uses the input unit 34 to input the growth assistance information for the first stage inflorescence to the fertilization control device 50. When the growth assistance information for the first stage flower floret is input to the fertilizer application amount setting unit 36, the input of the next day's fertilization amount data matches the input growth assist information and the growth index regardless of the elapsed days of the counter unit 30. To shift to fertilizer application data. In the example of FIG. The growth index of 20 is “0” indicating that the first stage inflorescence is not flowered. Since the growth index of No. 21 is “1” indicating the first stage inflorescence, Step No. It shifts to 21 fertilizer amount data and sets the fertilizer amount on the next day. After that, step no. The fertilizer application amount is set with reference to the fertilizer application data with the number of days elapsed from 21. For example, the reference step No. The next day after fertilization with reference to No. 21, step No. Step No. 21 after 1 day has passed. The fertilizer application amount is set with reference to FIG.

  On the contrary, the growth of the crop 1 is slow, and Step No. 21 In other words, a case is considered where the first stage floret does not bloom even when the number of elapsed days exceeds 21, and the growth assistance information for the first stage floret flowering cannot be input. In this case, the following method can be considered. First, in the first method, step No. is performed until the growth assist information for the first stage flowering is input. 20. That is, the fertilizer application amount is set based on the fertilizer application data before flowering of the first-stage inflorescence. According to this configuration, fertilization management according to the actual growth state of the crop 1 can be performed. The second method shifts to the next step without waiting for the input of the growth assist information. In this case, even if the growth assistance information for the first-stage flowering is not input, the step No. 21, step no. The step proceeds according to the number of days elapsed. According to this configuration, even when the operator forgets to input the growth assist information, it is possible to prevent a shortage of fertilizer applied to the crop 1. The third method combines the first method and the second method, stops the progress of the step until the growth assist information is input by taking the first method for a preset period, for example, 5 days, If the growth assistance information is not input after 5 days, the second method is used to set the step number. 21 Step No. The step is advanced according to the number of elapsed days. According to this configuration, the advantages of both the first method and the second method can be taken. In addition, it is preferable that an operator can select said method by setting operation to the fertilization control apparatus 50. FIG.

  As described above, the operator inputs the growth assist information indicating that the n-th flower floret has been flowered when the n-th flower floret has been flowered. And the fertilizer application amount setting part 36 transfers to the fertilizer application amount data of the step in which the input growth assistance information and growth index correspond, and performs the subsequent fertilizer application amount setting. By inputting this growth assist information, it is possible to correct a deviation in the growth state of the fertilization amount data string D and the actually cultivated crop 1.

Next, proportional application will be described. Without proportional applied before harvest initiation crop 1 in this example, it intends row proportional application from start harvesting. This is an application method particularly suitable for tomatoes .

  When the worker starts harvesting the crop 1, the worker inputs growth assist information indicating the start of harvesting. When the growth assistance information indicating the start of harvesting is input, the fertilizer application amount setting unit 36 shifts to fertilizer application amount data having a growth index at the start of harvesting and sets the fertilizer application amount. In FIG. 2, for convenience, “99” is a growth index indicating the start of harvesting. Therefore, the fertilizer application amount setting unit 36 has a step No. It shifts to the fertilization amount data of 85, sets the fertilization amount of quantitative management to 24 mg / strain, and sets the fertilization amount of concentration management to EC value 2.5. Moreover, the fertilizer application amount per one crop of proportional application is set to 7 mg / strain. And the fertilization control part 38 performs density | concentration management fertilization so that it may become EC value 2.5 as mentioned above. Then, when the set time is reached, the amount of fertilization is 24 mg / stock, and quantitative management fertilization is performed.

Next, the fertilization control device 50 performs proportional fertilization according to the amount of absorption transpiration of the nutrient solution by the crop 1. Here, the amount of water supplemented is used as a method for obtaining the absorption transpiration rate. The absorption transpiration amount may be obtained indirectly from the amount of solar radiation. As described above, when the crop 1 absorbs and evaporates the nutrient solution, the amount of the nutrient solution in the nutrient solution preparation tank 20 decreases. And if it falls below the minimum water level, the fertilization control part 38 will replenish water. The amount of replenishment at this time is measured by the flow meter 28 and output to the fertilization control unit 38. When the amount of supplemented water reaches a preset amount of supplemented water, the fertilizer application control unit 38 performs proportional application of the amount of fertilizer set by the fertilizer application amount setting unit 36. For example, when the amount of replenishment for performing proportional application is set to 0.5 L / strain, proportional application is performed for every 1500 L of water supplemented for a total of 3000 cultivated strains. The amount of fertilization at that time is step No. From 85 fertilizer application data, it is 7 mg / strain. Therefore,
Proportion of fertilizer for proportional application (g) is 0.007 x 3000 (stock) = 21 g
The application amount of the fertilizer stock solution a is 21 (g) /0.01 (wt%) = 2100 g≈2.1 L.
Therefore, in this case, every time 1500 L of water is replenished, proportional application of the fertilizer stock solution a 2.1 L is performed. However, since the amount of absorption transpiration of the crop 1 decreases at night, if proportional application is performed in the evening, the fertilizer component may remain in the nutrient solution preparation tank 20 until the next day. Therefore, the proportional application is preferably performed within a preset time range, for example, as shown in FIG. In this case, even if the amount of water replenishment exceeds 1500L at the time of 12:00, which is the time range, in May, proportional application is not performed. The proportional application time range may be set in units of seasons, weeks, or days instead of months.

Moreover, excessive fertilization may have an adverse effect on the crop 1. Therefore, when the quantitative management fertilization that takes place at the beginning of the day and the basal application, to set the upper limit to the sum of the base application a proportional application. For example, when the upper limit fertilization amount of quantitative management fertilization is 45 mg / strain, the total fertilization amount of base application and proportional application is 0.045 × 3000 (shares) = 135 g.
In the case where the value exceeds the value, the proportional application is not performed even within the time in which the proportional application is possible. In addition, the upper limit fertilizer application amount may be recorded in advance in a memory or the like of the fertilizer application control device 50, or may be directly input by an operator at the time of planting. Further, the fertilization amount data string D may include upper limit fertilization amount data. According to this structure, it becomes possible to change an upper limit fertilizer amount according to the elapsed days and the growth index of the crop 1.

  When the harvest period of the crop 1 ends and the cultivation of the crop 1 ends, the worker ends the fertilization management operation of the fertilization control device 50. At this time, the growth assistance information input during the cultivation period of the crop 1 may be reflected in the fertilization amount data string D. For example, step No. in which daily fertilization amount of quantitative management fertilization and concentration management fertilization and growth assist information are input. May be recorded in a memory or the like as a new fertilization amount data string D, and the new fertilization amount data string D may be used for hydroponics cultivation of the crop 1 during the next cultivation. Moreover, you may cultivate several times and use the average fertilization amount data as the new fertilization amount data sequence D. Furthermore, fertilization amount data when a very good harvest is obtained may be registered as a new fertilization amount data string D. According to these structures, fertilization management can be performed by the more superior fertilization amount data string D according to the installation place of the hydroponic cultivation system 100.

  In the fertilization amount data string D in FIG. 2, one step is made every elapsed day, but one step may be made every plural days, for example, every two days or every three days. Moreover, it is good also considering the continuous step with the same fertilization amount data as one step. According to these structures, the data amount of the fertilization amount data sequence D can be reduced.

  As described above, according to the fertilization control device 50 and the fertilization control program according to the present invention, the setting of the fertilization amount for the day is performed based on the fertilization amount data string D that changes according to the number of days that have elapsed since the planting date of the crop 1. Do. Further, the shift in the growth state of the fertilization amount data string D and the actually cultivated crop 1 is corrected by the growth assist information input by the operator. Thereby, management of the fertilization amount in hydroponics can be performed simply and appropriately. Further, by inputting the grass force information, the amount of fertilization can be finely adjusted, and the growth of the crop 1 can be controlled more finely.

  In addition, since said fertilization control apparatus 50 is an example, the structure of each part, operation | movement, a procedure, etc. are not specifically limited to this, This invention changes and implements in the range which does not deviate from the summary of this invention. It is possible.

1 crop
10 Hydroponics tank
34 Input section
36 Fertilizer setting section
38 Fertilization control unit
50 Fertilization control device
D Fertilizer application data string

Claims (2)

In the fertilization control device that manages fertilization to the hydroponic tank,
The crop is tomatoes,
Fertilization and a data row composed of a plurality of steps corresponding to the growth index of elapsed days and the crops from the date of planting the crop to hydroponic tank,
An input unit capable of inputting and vigor information indicating the state of foliage growth assisting information and the crop showing the state of growth of the crops,
A fertilizer application amount setting unit that sets the fertilizer application amount for the day based on the fertilizer application data string;
When the florets of the crop are first-stage florets, second-stage florets,... N-th stage florets in order from the root side, the growth assist information is information indicating that the n-th stage florets have opened or the start of harvesting. Information indicating
The fertilizer amount setting section refers to the fertilization amount data of steps corresponding to the number of days elapsed when growth assisting information is not input to set the amount of fertilizer applied, the said growth assisting information if the growth assisting information is input Move to the step that matches the growth index and refer to the fertilizer amount data to set the fertilizer amount, then set the fertilizer amount with reference to the fertilizer amount data based on the number of days elapsed since the transitioned step, and further The fertilization amount data referred to when the information is input is corrected based on the grass vigor information to set the fertilization amount, and after the information indicating the start of harvesting is input to the growth assist information, the upper limit fertilization amount The fertilizer application control apparatus characterized by performing proportional application according to the absorption transpiration amount of the nutrient solution within the range . In the fertilization control program that manages fertilization to the hydroponic tank,
The crop is tomatoes,
Based on the amount of fertilizer data string composed of a plurality of steps corresponding to the growth index of elapsed days and the crops from the date of planting the crop to hydroponics tank, the procedure for setting the amount of fertilizer of the day,
When the florets of the crop are arranged in order from the root side, the first florets, the second florets, and the nth florets,
Fertilization with reference to fertilization amount data in step corresponding to the number of days elapsed when growth assisting information indicating growth assisting information or harvesting started indicates that the n-th stage Hanabusa showing the state of growth of the crop is flowering is not input sets the amount was together with the growth assisting information is set with reference to fertilization and fertilization amount data and proceeds to step in which the growth assisting information and the growth index matches when entered, then proceeds step The fertilizer amount data is set by referring to the fertilizer amount data in terms of the number of days elapsed since the plant, and the correction based on the fertility information is applied to the fertilizer amount data that is referenced when the fertility information indicating the state of the foliage of the crop is input. The amount of fertilizer applied is set, and after the information indicating the start of harvesting is input to the growth assist information, the proportion is proportional to the absorbed transpiration amount of the nutrient solution within the upper limit fertilizer amount range. Also a procedure for use,
A fertilization control program for causing a computer to execute.

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