JP4312904B2 - Field environment purification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a field environment purification system used for prevention of contamination of groundwater by fertilization in a field such as a tea garden where tea is cultivated.
[0002]
[Prior art]
Fertilizers administered to tea gardens are decomposed into ammonia nitrogen by microorganisms in the ground, and this ammonia nitrogen is further decomposed into nitrate nitrogen (nitrate nitrogen), part of which is absorbed by tea trees, Fertilizers that are not absorbed by tea trees remain in the ground or gradually run away into groundwater, but the runoff becomes noticeable during rainfall.
[0003]
[Problems to be solved by the invention]
By the way, most of the fertilizer that is not absorbed by the tea tree flows into rivers, ponds, etc. through the groundwater, and much of the administered fertilizer is wasted. Slow-acting fertilizers have been used as fertilizers, but they cannot prevent runoff into groundwater.
[0004]
Then, this invention sets it as the 1st objective to provide the field environment purification system which aimed at prevention of contamination of groundwater by managing the amount of fertilization through groundwater.
[0005]
A second object of the present invention is to provide a field environment purification system that realizes reuse of fertilizers that have been washed away into groundwater to prevent contamination of groundwater.
[0006]
[Means for Solving the Problems]
The present invention includes detection means (fertilizer detector 26) and calculation means (control device 28) for detecting the fertilizer concentration of groundwater in the field (2), and uses the detected value of fertilizer concentration and the fertilizer application amount as calculation information. The amount of fertilizer to be administered to the water is predicted or calculated, or groundwater is collected by the water collecting means (underdrain 6, water absorption pipe 8, water collecting pipe 10) and stored in the water storage means (groundwater tank 12), and the detected value of fertilizer concentration Is more than the reference value, it is reused by supplying water to the field using water supply means (water supply pipe 40). As a result, by controlling the amount of fertilization through groundwater, it is possible to prevent contamination of groundwater and to reuse fertilizer that has flowed into groundwater, that is, nitrate nitrogen.
[0007]
In order to achieve the first object, the field environment purification system of the present invention according to claim 2 is the configuration of claim 1, wherein the detection value of the detection means and the amount of fertilizer applied to the field are calculated information. An arithmetic means (control device 28 ) for predicting and calculating the fertilizing amount to be administered to the field is provided.
[0008]
That is, the fertilizer concentration in the groundwater is the amount of fertilizer runoff and depends on the amount of fertilizer applied and the amount of plant absorption in the field. Therefore, the optimum fertilizer application amount is predicted and calculated from the relationship between the fertilizer concentration in the groundwater and the fertilizer application amount that will be proportional to the runoff amount. That is, by observing the relationship between the amount of fertilization and the amount of runoff, a certain functional relationship can be found, and the optimum amount of fertilization can be calculated from this relationship. In this case, variables based on rainfall and plant growth are also taken into account. Therefore, by realizing the optimum fertilizer application amount, waste of fertilizer can be eliminated and groundwater contamination by the fertilizer can be reduced.
[0009]
In order to achieve the second object, the field environment purification system of the present invention according to claim 1 is a field environment purification system that supplies groundwater to the field, and is buried in the ground to collect groundwater (25). Single or plural water collecting means (underdrain 6, water absorption pipe 8, water collecting pipe 10), water storage means (ground water tank 12) for storing the ground water collected by the water collecting means, and fertilizer concentration of the ground water Detection means (fertilizer detector 26) for detecting water, and water supply means (water supply pipe 40) for supplying the groundwater from the water storage means to the field (2) when the detection value of the detection means is greater than or equal to a reference value; Switching means (valve 34) for storing the groundwater in the water storage means when the detection value of the detection means is greater than or equal to a reference value, and for discharging the groundwater when the detection value of the detection means is less than the reference value. Provided with the water supply means, Characterized in that the serial reservoir means for the water supply of the ground water in the field.
[0010]
A water collecting means is buried in the ground to collect ground water, and the ground water is stored in the water storing means. The fertilizer concentration in the groundwater is detected, and when the fertilizer concentration is equal to or higher than the reference value, the groundwater is guided from the water storage means to the field and supplied to recycle the fertilizer in the groundwater. That is, the nitrate nitrogen that has flowed out can be recovered through groundwater and reused as fertilizer. Therefore, excessive fertilizer administration can be prevented and contamination of groundwater can be prevented.
[0012]
In this field environment purification system, whether to store or discharge water is selected according to the fertilizer concentration of the collected groundwater. That is, if the fertilizer concentration in the groundwater is less than the reference value, the groundwater will not be polluted, so it will be discharged as it is, and if the fertilizer concentration is above the reference value, it will be stored in the water storage means and reused. . That is, the groundwater of the water storage means is supplied to the farm field by the water supply means. Therefore, excessive fertilizer administration can be prevented by using groundwater, and contamination of groundwater can be prevented. When fertilizer concentration is low, groundwater is not polluted even if it is discharged.
The field environment purification system of the present invention according to claim 3, wherein the switching means is a valve installed in the water collecting pipe immediately before the water storage means for collecting and storing the groundwater absorbed by the water absorbing pipe, When the detection value of the detection means is greater than or equal to a reference value, the groundwater is stored in the water storage means through the valve, and when the detection value of the detection means is less than the reference value, the groundwater is discharged from the valve. Also good.
[0013]
The field environment purification system of the present invention according to claim 4 comprises the concentration means for concentrating the groundwater stored in the water storage means and converting it into concentrated water having a high fertilizer concentration in the configuration according to claim 1, the water supply means and water supply to Turkey the concentrated water of the water storage unit in the field.
[0014]
If the collected groundwater is stored in a storage means, the groundwater is concentrated and converted to concentrated water with high fertilizer concentration, and if this concentrated water is supplied to the field, fertilizer can be reused, and excess fertilizer It can prevent administration and prevent contamination of groundwater.
[0015]
The field environment purification system of the present invention according to claim 5 is a filtration means (separation membrane 46) for filtering the groundwater of the water storage means, and a water discharge means (valve 50) for discharging the groundwater filtered by the filtration means. It is characterized by comprising. That is, the groundwater collected and collected in the water storage means is filtered by the filtering means, thereby recovering the lost fertilizer and discharging the filtered groundwater to prevent contamination of the groundwater. .
[0016]
The field environment purification system of the present invention according to claim 6 is a purification means (separation membrane 46) for purifying the groundwater of the water storage means, and a water discharge means (valve 50) for discharging the purified water purified by the purification means. It is characterized by comprising. That is, the groundwater collected and stored in the water storage means is purified by the purification means, and discharged to prevent contamination of the groundwater.
[0017]
The field environment purification system of the present invention according to claim 7 is characterized in that a porous pipe (24) for selectively collecting the groundwater is used as the water collecting means. That is, the fertilizer can be recovered together with the groundwater by burying the porous tube in the ground.
[0018]
The field environment purification system of the present invention according to claim 8 is characterized by comprising transmission means (transmitter 32) for transmitting the fertilizer concentration detected by the detection means. That is, when the field and the field manager are separated from each other, it is easy to manage the field by transmitting information such as the fertilizer concentration using a communication medium such as an electric communication line or wireless by a transmission means installed in the field. And speeding up.
[0019]
And the field environment purification system of this invention which concerns on Claim 9 is provided with the pumping means (pump 36) by which the said water supply means pumps the said groundwater to the said field. That is, by providing the pressure feeding means, it is possible to supply water with a desired water pressure to a farm field having a large height difference.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
[0021]
FIG. 1 shows a fertilization management system which is a first embodiment of a field environment purification system of the present invention. Taking a tea plantation where the tea tree 4 is cultivated in the field 2 as an example, the field 2 is a so-called terraced field in which narrow flat portions 2A, 2B, 2C,. Fertilization is performed as necessary on the tea tree 4 which is a cultivated plant planted in each of the flat portions 2A to 2C. In each of the flat portions 2 </ b> A to 2 </ b> C, a culvert 6 is individually formed as a means for collecting groundwater, and each water intake pipe 8 embedded in each culvert 6 is connected to a water collection pipe 10. The water collecting pipe 10 is laid in the ground in the agricultural field 2. Therefore, as shown by the arrow A, the groundwater in the field 2 is collected in the water collecting pipe 10 through the water absorption pipe 8 of the underdrain 6 and guided to the groundwater tank 12 which is a water storage means.
[0022]
As shown in FIG. 2, each culvert 6 is a groove that is dug by 1 to 2 m from the ground surface 16 in a flat area 2 </ b> A to 2 </ b> C of the farm field 2. It is covered with water material 18 and soil 20 is piled on it. The water absorption pipe 8 is formed of a corrosion-resistant material such as a synthetic resin. For example, as shown in FIG. 3, a porous pipe 24 having a plurality of water absorption through holes 22 is used. The water flow material 18 has a function of preventing the water absorption through hole 22 from being clogged. Therefore, as shown in FIG. 2, only the groundwater 25 is selectively absorbed into the water absorption pipe 8.
[0023]
As shown in FIG. 4, the groundwater supplied through the culvert 6 is collected in a single or a plurality of water collecting pipes 10 and guided to the groundwater tank 12 through the water collecting pipes 10. In this case, in FIG. 4, the underdrain 6 and the water absorption pipe 8 are written horizontally, but the water collection effect by gravity is used by utilizing the inclination of the field 2. Arrows indicate the collected groundwater collection status.
[0024]
The water collecting pipe 10 leading to the groundwater tank 12 is provided with a fertilizer detector 26 that is a fertilizer detection means and a flow rate detector 27 that is a flow rate detection means. The fertilizer detector 26 is a general term for various measuring devices that measure fertilizer components and groundwater conditions, that is, groundwater PH, EC value, NO ₃ —N, NH ₄ —N, PO ₄ , K, Ca, Mg, and the like. is there. The flow rate detector 27 detects the flow rate of groundwater collected in the water collection pipe 10. Further, a rain gauge 29 is installed as a rainfall detection means.
[0025]
And each detection output of this fertilizer detector 26, the flow volume detector 27, and the rain gauge 29 is added to the control apparatus 28 as a calculating means and a control means, as shown in FIG. The control device 28 is constituted by a personal computer or the like, and its output is applied to a display 30 and a transmitter 32. In this case, as for the detection output of the fertilizer detector 26, the administrator may add each detection value to the control device 28 through input means such as a keyboard. In this control device 28, the amount of fertilizer spilled and the amount of soil fertilizer remaining (fertilization amount−flow spilled amount) can be calculated from the detected value of the fertilizer detector 26. That is, the fertilizer concentration in the groundwater is the amount of fertilizer runoff and depends on the amount of fertilizer applied and the amount of plant absorption in the field. Therefore, it is possible to predict and calculate the optimum fertilizer amount from the relationship between the fertilizer concentration in the groundwater and the fertilizer amount that would be proportional to the amount of runoff. By obtaining the relationship between the fertilization amount and the runoff amount and observing the transition, the optimum fertilization amount can be calculated for the cultivated plants such as the field 2 and the tea tree 4. In this case, the fertilizer includes not only the fertilizer but also the tea tree itself that has been cut at the time of autumn branching, but it may take into account variables such as the amount of rainfall and the growth state of the plant. If the optimum fertilizer application amount is realized, waste of fertilizer can be eliminated and groundwater contamination by fertilizer can be suppressed.
[0026]
Here, if the fertilizer runoff amount is A, the fertilizer concentration detected by the fertilizer detector 26 is p, the groundwater flow rate detected by the flow rate detector 27 is q, and the rainfall amount detected by the rain gauge 29 is r, the fertilizer The runaway amount A is
A = p × q = p × r (1)
It becomes. In addition, since all groundwater cannot be supplemented to q, a coefficient is applied. Further, r has a decrease due to evaporation or the like. Also, the residual nitrogen amount in soil according to tea growth is B, the tea tree nitrogen absorption amount according to tea growth is C, the nitrogen decomposition speed for each input fertilizer and the nitrogen generation amount calculated based on this is D, E is Indicates fertilizer input, and there are types and amounts of input fertilizer. These are shown in the graph as shown in FIG. In FIG. 5, the fertilizer run-off amount A is an actual measurement value, the soil residual nitrogen amount B and the tea tree nitrogen absorption amount C are estimated amounts, and the nitrogen generation amount D is a predicted value by simulation. The fertilizer runoff amount A is proportional to the height of the fertilizer concentration in the soil, and the residual nitrogen amount B in the soil is more marginal, that is, the residue is required as the amount of fertilizer absorption by the tea tree increases.
[0027]
Therefore, in relation to fertilizer runoff amount A, soil residual nitrogen amount B, tea tree nitrogen absorption amount C and nitrogen generation amount D,
D-B-A-C = 0 (2)
Thus, if fertilizer input E is controlled, optimum fertilization can be realized. In this case, the amount of air released by nitrogen gas was omitted.
[0028]
By the way, the residual nitrogen amount B in the soil can be measured by an EC sensor, a PF sensor, etc., and the absorption amount of the tea tree 4 can be set from the actual measurement value by D-A-B. be able to.
[0029]
Further, since A is added to D and reused, the fertilizer input E can be controlled so that D−B−C = 0.
[0030]
The display 30 displays the detected value, the calculation result, and the like. In this case, if the fertilizer concentration detected by the fertilizer detector 26 is equal to or higher than a preset reference value, water discharge from the groundwater tank 12 is prohibited, an alarm is displayed to the administrator, and attention is urged. The groundwater stored in the groundwater tank 12 can be used as irrigation or reused as fertilizer.
[0031]
Next, FIG. 6 shows a fertilizer collection / reuse system which is a second embodiment of the field environment purification system of the present invention. Also in this embodiment, a tea garden in which the tea tree 4 is cultivated in the field 2 is taken as an example. The field 2 is a so-called terraced field in which the narrow plane portions 2A, 2B, 2C,... Form a step shape, and the tea plant 4 that is a cultivated plant planted in each of the plane portions 2A to 2C is provided as necessary. Fertilization is performed. In each of the flat portions 2A to 2C, a culvert 6 is individually formed for collecting groundwater, and each water absorption pipe 8 embedded in each culvert 6 is connected to the water collection pipe 10, and the water collection pipe 10 Is laid in the ground in the field 2. Accordingly, the groundwater in the field 2 is collected in the water collecting pipe 10 through the water suction pipe 8 of the underdrain 6 and guided to the groundwater tank 12. The structure of the underdrain 6 is as shown in FIG. 2, the form of the water absorption pipe 8 is as shown in FIG. 3, and the form of the underdrain 6, the water absorption pipe 8 and the underground water tank 12 is as shown in FIG.
[0032]
A fertilizer detector 26 is provided in the water collecting pipe 10 in the vicinity of the groundwater tank 12. The fertilizer detector 26 is a general term for various measuring devices that measure fertilizer components and groundwater conditions, that is, groundwater PH, EC value, NO ₃ —N, NH ₄ —N, PO ₄ , K, Ca, Mg, and the like. is there. The detection output of the fertilizer detector 26 is added to the control device 28, and the control device 28 compares the fertilizer concentration with a reference value as an operation related to the detection output.
[0033]
A valve 34 as a switching means and a water discharge means is installed in the water collecting pipe 10 immediately before the ground water tank 12. That is, the switching control of the valve 34 is performed by the control device 28 which is a control means. When the fertilizer concentration of the groundwater is equal to or higher than the reference value, the control is switched to the water storage side X and the groundwater is guided to the groundwater tank 12. In this case, the water is switched to the water discharge side Y and discharged to the outside.
[0034]
A pump 36 is provided as means for pumping the groundwater stored in the groundwater tank 12, and the pump 36 is driven and controlled by the control device 28. The groundwater pumped by the pump 36 is reused, led from the groundwater tank 12 to each tea tree 4 side through the water supply pipe 40 laid in the field 2 and used for irrigation and the like. Arrow B indicates pumping of groundwater.
[0035]
If comprised in this way, after fertilization, the fertilizer which ran away from the field 2 by precipitation etc. will be collected by the water collection pipe | tube 10 through the water absorption pipe | tube 8 of the culvert 6 with groundwater. The groundwater in the water collecting pipe 10 passes through the fertilizer detector 26, and the fertilizer concentration is detected. In this case, fertilizer concentrations such as groundwater PH, EC value, NO ₃ —N, NH ₄ —N, PO ₄ , K, Ca, and Mg are measured. In some cases, it cannot be denied that the numerical value may cause environmental pollution. Therefore, the reference value set in advance is compared with the detected fertilizer concentration. The comparison result is displayed on the display 30 and notified to a manager in a remote place through a transmitter 32 by radio or telephone line. In that case, if the reference value is greatly exceeded, a display or warning is issued. The display device 30 may perform visual display, audio display, or the like, and may take a measurement result or calculation result on a recording sheet with a printer or the like.
[0036]
As a result of measuring the fertilizer concentration, if the fertilizer concentration is less than the reference value, there is no risk of environmental pollution, so the valve 34 is switched to the discharge side Y and discharged into a river or the like through the drainage ditch. In this case, the groundwater may be guided and stored in the groundwater tank 12 regardless of the fertilizer concentration of the groundwater.
[0037]
Further, when the fertilizer concentration is equal to or higher than the reference value as a result of the measurement of the fertilizer concentration, it can be reused as a fertilizer. Therefore, the valve 34 is switched to the water storage side X and stored in the groundwater tank 12. Since this groundwater contains reusable nitrate nitrogen, it is pumped together with the groundwater by the pump 36 and irrigated to the field 2 through the water supply pipe 40. As a result of this irrigation, nitrate nitrogen, which is a fertilizer component, is supplied to the field 2, and the deficiency lost due to precipitation can be compensated. As a result, it is possible to prevent environmental pollution due to excessive fertilization as well as reuse of fertilizer and irrigation.
[0038]
Next, FIG. 7 is a block diagram showing a fertilizer recovery and concentration system from groundwater. This system collects the fertilizer that has been washed away into the groundwater, concentrates the fertilizer concentration in the accumulated groundwater, and purifies the groundwater for irrigation or natural discharge.
[0039]
In the groundwater tank 12, groundwater flowing through the water collecting pipe 10 is stored. In this case, groundwater is collected regardless of fertilizer concentration. A water supply pipe 40 is connected to the groundwater tank 12 through a pump 36 in the system shown in FIG. A pump 44 as a pressurizing means is connected to the groundwater tank 12 through a filter 42 that removes impurities in the groundwater, and the groundwater is pressurized and pumped to the separation membrane 46 through the pump 44.
[0040]
This separation membrane 46 is a fertilizer concentration means, a groundwater filtration means or a purification means, and uses a reverse osmosis membrane such as a membrane that permeates water but does not permeate nitrate nitrogen ions. That is, it is a means for separating condensed water and purified water. The condensed water is returned to the groundwater tank 12 from the separation membrane 46, and the purified water is supplied from the separation membrane 46 to the purified water tank 48 and stored therein. The purified water stored in the purified water tank 48 is naturally discharged through a valve 50 which is a water discharge means. That is, the drive of the pump 44 and the valve 50 is controlled by the control device 28 which is a control means, and the groundwater in the groundwater tank 12 circulates through the separation membrane 46 by the drive of the pump 44, and the fertilizer concentration can be increased. That is, fertilizers such as nitrate nitrogen diluted and washed away in the ground water during the rain can be collected from the ground water and administered to the field 2 through the water supply pipe 40.
[0041]
A tank having a smaller capacity than the groundwater tank 12 is used as the purified water tank 48, and natural discharge is possible by opening the valve 50 in accordance with the generation of purified water. Although purified water is not shown, it can be supplied to the water supply pipe 40 side and used for irrigation of the field 2, and even if it is discharged naturally, it does not cause groundwater contamination and contributes to environmental purification.
[0042]
By the way, the explanation of fertilizer administration in tea gardens is closely related to the product quality of green tea and the concentration of total nitrogen and free amino acids contained in crude tea. Efforts have been made to increase nitrogen and free amino acid concentrations. As a result, large amounts of nitrogen fertilizer became normal in tea cultivation, and problems such as strong acidity of the soil, weakening of the tree due to root death, groundwater contamination by nitrate nitrogen, and generation of nitrous oxide gas were raised. As a result, nitrate nitrogen was added to the environmental standards for public water areas and groundwater, and standard values were set from the viewpoint of preventing environmental pollution. In other words, assuming that 1000 tons of water flows out of the system from the tea garden of 10a per year, only about 10 kg of nitrogen can be released.
[0043]
From such a standpoint, by using the fertilizer recovery and reuse of the present invention, the nitrogen use efficiency of tea can be significantly improved, and the environmental standards can be cleared by removing the nitrogen component that flows out. confirmed. In particular, it contributes to the prevention of environmental pollution by nitrate nitrogen, purification of water, promotion of denitrification in the lower soil, etc. in combination with the use of slow-acting fertilizers and the substantial extension of the residence time of fertilizer components in the root zone. be able to.
[0044]
In order to remove nitrate nitrogen from the groundwater stored in the groundwater tank 12, instead of the method using the separation membrane 46, a physicochemical method such as an ion exchange method or a reverse osmosis method, or a living organism utilizing the ability of reducing microorganisms. Denitrification method can be used. In the ion exchange method, ions in water to be removed are removed by exchanging them with ions of an ion exchanger. Usually, a strongly basic anion exchange resin is used to remove nitrate nitrogen. That's fine. In the reverse osmosis method, water molecules are generally known to move from the lower concentration side to the higher concentration side of the solution on both sides of the semipermeable membrane, but it penetrates into the higher concentration solution. Conversely, when a pressure higher than the pressure difference is applied, nitrate nitrogen can be removed from the groundwater by utilizing the phenomenon that water molecules move from the higher concentration to the lower concentration.
[0045]
The biological denitrification method is a method of removing nitrate nitrogen in water by the denitrification action of denitrifying bacteria, and the denitrifying bacteria are fixed to a carrier so as not to diffuse into water. A carrier in which denitrifying bacteria are fixed is introduced into groundwater, or nitrate water is removed by passing groundwater through a carrier layer in which denitrifying bacteria are fixed. Microorganisms having denitrification ability are distributed in nature, and about 20% of anaerobic bacteria are said to fall under this category.
[0046]
Further, a penetration barrier may be installed in the farm field 2. This permeation barrier is a layer of a carrier on which microorganisms (denitrifying bacteria) are fixed, and is installed in a portion above the aquifer under the upland farming area or livestock production area where the nitrogen component is supplied. That is, when permeated water containing nitrate nitrogen passes through the permeation barrier, nitrate nitrogen is reduced to nitrogen gas by the denitrifying action of the denitrifying bacteria, and the permeation of nitrate nitrogen deeper than the permeation barrier is blocked. I can expect. There are a conventional method and a horizontal well method for installing the permeation barrier. The former is a method in which the surface soil is once removed, the microbial carrier is spread, and then the soil is refilled. The latter is a method of providing a plurality of horizontal wells and filling the wells with microbial carriers. In the horizontal well method, oblique digging is started with a drill, and when a predetermined depth is reached, the digging proceeds to horizontal digging. When the horizontal digging reaches a planned point, the tip of the drill is turned diagonally upward and drilled. After reaching the ground, there are various methods such as switching the tip to a reverse drill and finishing the well while drawing the well pipe filled with the carrier.
[0047]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
a Since the fertilizer concentration in the groundwater in the field can be detected and the fertilizer application amount can be set according to the cultivated plant and land according to the detected value, waste of the fertilizer can be suppressed and groundwater contamination can be prevented.
b Groundwater whose fertilizer concentration is below the standard value is discharged, which can prevent groundwater contamination and contribute to environmental purification.
c. Fertilizer that has been washed away into groundwater can be collected through groundwater, and groundwater can be irrigated and used, and the amount of fertilizer applied can be reduced by reusing the collected fertilizer.
d The detected value of the fertilizer concentration in the groundwater can be transmitted to the field manager through a communication line, etc., so that the state of groundwater contamination can be immediately known, and it can contribute to speeding up the measures necessary for preventing groundwater contamination.
e Underground burial promotes drainage of soil, preventing excess water from rising to the surface, improving oxygen supply to the roots of cultivated plants such as tea trees and improving the yield and quality of tea leaves be able to.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a fertilization management system which is a first embodiment of a field environment purification system of the present invention.
FIG. 2 is a cross-sectional view showing a form of underdrain.
FIG. 3 is a perspective view showing a perforated pipe as an embodiment of a water collecting pipe.
FIG. 4 is a diagram showing an embodiment of a culvert, a water collection pipe, and a groundwater tank.
FIG. 5 is a diagram showing a relationship among fertilizer runoff amount A, soil residual nitrogen amount B, tea tree nitrogen absorption amount C, and nitrogen generation amount D;
FIG. 6 is a block diagram showing a fertilizer recovery / reuse system according to a second embodiment of the field environment purification system of the present invention.
FIG. 7 is a block diagram showing a fertilizer recovery and concentration system from groundwater.
[Explanation of symbols]
2 Farm 4 Tea plant 6 Underdrain (water collecting means)
8 Water absorption pipe (water collecting means)
10 Water collecting pipe (water collecting means)
12 Groundwater tank (water storage means)
24 Porous pipe 25 Groundwater 26 Fertilizer detector (detection means)
28 Control device (control means, calculation means)
32 Transmitter (Transmission means)
34 Valve (switching means)
40 Water supply pipe (water supply means)
46 Separation membrane (concentration means, filtration means, purification means)

Claims (9)

A field environmental purification system for supplying groundwater to a field,
Single or multiple water collecting means buried in the ground and collecting groundwater;
Water storage means for storing the groundwater collected by the water collection means;
Detecting means for detecting the fertilizer concentration of the groundwater;
When the detection value of the detection means is greater than or equal to a reference value, the water supply means for supplying the groundwater from the water storage means to the field,
When the detection value of the detection means is greater than or equal to a reference value, the ground water is stored in the water storage means, and when the detection value of the detection means is less than the reference value, switching means for discharging the ground water;
And the groundwater is supplied from the water storage means to the field by the water supply means .   The field environment purification system according to claim 1, further comprising a calculation means for predicting and calculating a fertilization amount to be administered to the field using the detection value of the detection means and the fertilization amount administered to the field as calculation information. . The switching means is a valve installed in the water collection pipe immediately before the water storage means for collecting and storing the groundwater absorbed in the water absorption pipe, and when the detection value of the detection means is a reference value or more switching the valve accumulate the groundwater to the water storage means, according to claim 1, wherein the field environment detection value of the detection means in the case of less than the reference value, characterized in that to discharge water to the ground water by switching the valve Purification system.   Concentration means for concentrating the groundwater stored in the water storage means to convert it into concentrated water having a high fertilizer concentration, and supplying the concentrated water of the water storage means to a field by the water supply means. Item 1. A farm environment purification system according to Item 1. Filtering means for filtering the groundwater of the water storage means;
Water discharge means for discharging the groundwater filtered by the filtration means;
Field environmental purification system of claim 1 or 4, wherein further comprising a. Purification means for purifying the groundwater of the water storage means;
Water discharge means for discharging purified water purified by the purification means;
Field environmental purification system of claim 1 or 4, wherein further comprising a. Field environmental purification system of claim 1 or 4, wherein the using the porous pipe for selectively collecting the ground water in the water collecting means. Field environmental purification system of claim 1 Symbol mounting characterized by comprising a transmitting means for transmitting a fertilizer concentration detected by the detection unit.   The field environment purification system according to claim 1 or 4, wherein the water supply means is provided with a pumping means for pumping the groundwater to the field.

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