A method for constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources.

Abstract

This invention discloses a method for constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources. The method comprises three parts: an isolation section, a drainage section, and an irrigation section. The isolation section uses corrugated isolation plates to separate the topsoil layer from the original soil layer, preventing deep salt from rising. The drainage section collects excess water using corrugated isolation plates and C-shaped drainage pipes, preventing water waste. The irrigation section is equipped with a mixing tank and solenoid valves to regulate the water volume in the collection pool for irrigation, or mixes the water with external water for regulation before irrigation. This method achieves efficient utilization of topsoil resources, effectively prevents topsoil desalination, solves the problems faced in saline-alkali land management, and realizes the recycling and conservation of water resources. Overall, this method scientifically protects topsoil resources while also improving the ecological environment of saline-alkali land.

Description

Technical Field

[0001] This invention relates to the field of soil utilization and improvement technology, and in particular to a method for constructing a fertile layer in a greenhouse in saline-alkali land using topsoil resources. Background Technology

[0002] Topsoil is a scarce and non-renewable basic resource with significant ecological and economic value. In recent years, due to various factors such as land occupation for construction, ecological restoration through farmland conversion, and agricultural restructuring, the total amount of topsoil has been declining. Extensive surface disturbance and excavation during construction projects have resulted in severe topsoil loss and waste. According to regulations, topsoil must be stripped from the land area before construction begins. Domestic research on topsoil stripping is still in its early stages, and the utilization rate of high-quality topsoil is low. In actual stripping operations, large amounts of high-quality topsoil are not rationally allocated and effectively utilized, ultimately ending up in topsoil storage areas, leading to nutrient loss and wasting topsoil resources.

[0003] Saline-alkali land refers to soil with excessively high salt and alkalinity levels, exceeding the range required for normal crop growth. It is characterized by high salinity, high alkalinity, low permeability, and low fertility, negatively impacting crop growth. my country has one of the largest areas of saline-alkali land in the world, accounting for approximately one-seventh of its land area, mainly distributed in the North China Plain, Northeast Plain, Northwest Inland Basin, and Southwest Hilly Basin. To address saline-alkali land, the government and researchers have implemented a series of measures, including physical, chemical, and biological methods such as soil improvement and the introduction of salt-tolerant crops. These measures have improved the situation of saline-alkali land to some extent, but overall, they all have some drawbacks, and the soil improvement effects are difficult to maintain in the long term.

[0004] Physical methods, as the most effective way to improve saline-alkali land, are currently adopted in most areas. For example, traditional flood irrigation and newer methods such as drip irrigation under mulch and root irrigation have achieved great success in improving saline-alkali land in central and western China, but they also have some problems. These mainly include the following: First, the effect is short-lived. Although different irrigation methods leach salt in a certain area of ​​the topsoil, meeting the crop's growth needs for a short period, salt from deeper soil layers is transported to the surface during evaporation. After evaporation, salt accumulates in the surface soil, harming the crops. Second, irrigation methods in some areas cannot effectively control soil moisture content. For example, in the treatment of saline-alkali land in coastal areas and greenhouses, large amounts of water are often used to ensure the soil salinity meets the crop's growth needs. This leads to increased moisture in the topsoil, and without corresponding drainage measures, it ultimately causes root hypoxia and crop death, resulting in reduced yields. Third, water resources are wasted. Although many water-saving irrigation methods have been proposed in recent years, there are still shortcomings in precise control and the recycling of water resources has not been considered. Fourth, fertilizer utilization efficiency is low. Most farmers apply large amounts of fertilizer at different growth stages of crops in pursuit of high yields. However, the utilization rate of these fertilizers is often low. Besides being absorbed by crops and lost through ammonia volatilization, most of the nitrogen and phosphorus elements leach into deeper soil layers, contributing to groundwater pollution along with irrigation water. This phenomenon is widespread throughout the country; a typical example is the excessive nitrogen and phosphorus content in groundwater in areas surrounding Shaanxi Province. If these problems are not addressed for a long time, they will have a significant impact on the improvement of saline-alkali land and the ecological environment.

[0005] Therefore, combining topsoil utilization with saline-alkali land management is a new way to make efficient use of topsoil resources. However, how to make scientific use of topsoil resources, prevent the salinization of high-quality topsoil, and eliminate some of the problems faced by saline-alkali land is an important challenge. Summary of the Invention

[0006] The purpose of this invention is to provide a method for constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources. This method prevents the salinization of high-quality topsoil through specific irrigation and drainage techniques, achieving scientific utilization of topsoil, water conservation and salt control, and efficient use of water and fertilizer. It solves the problems of low utilization rate of high-quality topsoil and waste of topsoil resources in existing soil stripping projects, as well as the problems of short improvement time, difficult drainage in greenhouses, serious waste of water resources and groundwater pollution in saline-alkali land management.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a method for constructing a fertile layer in a saline-alkali greenhouse using topsoil resources, comprising an isolation section, a drainage section, and an irrigation section. The isolation section includes an isolation plate, which is installed between the bottom of the topsoil in the greenhouse and the top of the original saline-alkali soil. The isolation plate is sheet-like and spliced ​​together. The isolation plate is provided with connecting holes and anti-slip triangular plates for the topsoil. The drainage section includes a C-shaped drainage pipe and a water collection tank. The outlet end of the isolation plate is connected to the C-shaped drainage pipe, and the lower end of the C-shaped drainage pipe is connected to the water collection tank. The irrigation section includes a water supply pipe, a mixing tank, a water delivery pipe, an irrigation control component, and a central controller. The bottom of the water collection tank is connected to the water supply pipe of the greenhouse. A mixing tank is installed in the middle of the water supply pipe, and the upper end of the mixing tank is connected to the water delivery pipe. The central controller is used to control the switching of the irrigation control component to provide irrigation water to the greenhouse.

[0008] Preferably, the isolation plate is a corrugated isolation plate, and the connecting holes are evenly distributed on the upper peak surface of the wave band of the corrugated isolation plate, and the surface anti-slip triangular plates are also evenly distributed on the upper peak surface of the wave band of the corrugated isolation plate; the corrugated isolation plate is made of polyethylene sheet.

[0009] Preferably, with the center line of the greenhouse as the axis, the isolation plates on both sides of the center line of the greenhouse are symmetrically inclined. The horizontal height of the end of the isolation plate closer to the center line of the greenhouse is higher than the horizontal height of the end farther from the center line of the greenhouse. The port of the end of the isolation plate away from the center line of the greenhouse is connected to the C-shaped drainage pipe.

[0010] Preferably, the two ends of the C-shaped drain pipe have a height difference, with the horizontal height of the lower end pipe opening closer to the water collection tank being lower than the horizontal height of the upper end pipe opening farther from the water collection tank; an anti-clogging protective net is provided at the lower end pipe opening.

[0011] Preferably, a water level monitor is arranged at one corner of the water collection tank, and a salinity monitor is installed inside the mixing tank; the irrigation control unit includes a one-way solenoid valve, a solenoid valve, a solenoid valve, and a water pump integrated assembly; a one-way solenoid valve is installed between the mixing tank and the water collection tank, a solenoid valve is installed between the mixing tank and the water delivery pipe, and an electronic valve and a water pump integrated assembly are installed at the outlet end of the mixing tank; the central controller is installed at the upper end of the mixing tank near the ground surface, and the central controller is connected to the one-way solenoid valve, the solenoid valve, the solenoid valve, and the water pump integrated assembly via sensor lines.

[0012] Preferably, the water supply pipe is located on one side of the greenhouse and arranged vertically, and the water supply pipe is located in the middle of the greenhouse and laid along the length of the greenhouse.

[0013] Preferably, the process of deploying topsoil resources in the saline-alkali land greenhouse is as follows:

[0014] The first step is to peel off the surface layer of salt-accumulated soil in the saline-alkali land to a depth of 60-100cm. After the salt-accumulated soil is peeled off, the isolation, drainage and irrigation sections are laid out.

[0015] The second step is to lay corrugated isolation panels. The finished corrugated isolation panels are 2*3m sheets. The corrugated isolation panels are laid on top of the original saline-alkali soil by splicing them together in sequence. Under the action of gravity potential energy, the excess water in the soil layer will automatically seep into the lower peak surface of the corrugated isolation panels after contacting them, and flow along the U-shaped area of ​​the lower peak surface to the C-shaped drainage pipe.

[0016] The third step is to lay the C-shaped drainage pipe. The opening of the drainage pipe is located at the top of the C-shaped drainage pipe. The seepage water flowing out from the lower peak of the corrugated isolation plate can enter the C-shaped drainage pipe through the opening. When laying the pipe, the relative positions of the corrugated isolation plate, the C-shaped drainage pipe, and the collection tank need to be considered. That is, the end of the C-shaped drainage pipe that is closer to the collection tank should be lower than the other end. This ensures that the water that seeps into the corrugated isolation plate can flow along the lower peak of the corrugated isolation plate to the C-shaped drainage pipe, and then flow through the C-shaped drainage pipe to the collection tank. The upper end of the C-shaped drainage pipe is closed.

[0017] Step 4: Excavate a water collection tank. The water collection tank is located on one side of the greenhouse, and its horizontal position is lower than the C-shaped drainage pipe. The inside is reinforced with concrete. When setting up the tank, a water level monitor needs to be installed in one corner to monitor the water level changes in the tank in real time after the drainage from the greenhouse. When the water level exceeds the safe level, the water in the tank needs to be treated in conjunction with the central controller. A water supply pipe should be reserved below the water collection tank near the greenhouse.

[0018] Step 5: Install the irrigation system and central control components. The salt content monitor inside the mixing tank detects the salt content of the water discharged from the greenhouse in the collection pool. When the salt content meets the growth standards for greenhouse crops, the water in the collection pool is used directly for irrigation. When the salt content exceeds the standard, the water in the water supply pipe and the water in the collection pool are mixed in the mixing tank to meet the standard before irrigation.

[0019] Step 6: Arrangement of water supply and water supply pipes. The water supply pipe is located on one side of the greenhouse and arranged vertically, while the water supply pipe is located in the middle of the greenhouse to facilitate daily irrigation water intake.

[0020] Step 7: Topsoil backfilling. After all components are in place, backfill the topsoil resources onto the corrugated isolation plate until they are flush with the original soil surface.

[0021] The present invention achieves the following beneficial technical effects compared to the prior art:

[0022] This invention discloses a method for constructing a fertile layer in a saline-alkali land greenhouse using topsoil resources. The method comprises three parts: an isolation section, a drainage section, and an irrigation section. The isolation section uses corrugated isolation plates to separate the topsoil layer from the original soil layer, preventing deep salt from rising. The drainage section collects excess water using corrugated isolation plates and C-shaped drainage pipes, preventing water waste. The irrigation section is equipped with a mixing tank and solenoid valves to regulate the water volume in the collection pool for irrigation, or mixes the water with external water for regulation before irrigation. This method achieves efficient utilization of topsoil resources, effectively prevents topsoil desalination, solves problems faced in saline-alkali land management, and realizes the recycling and conservation of water resources. Overall, this method scientifically protects topsoil resources while also improving the ecological environment of saline-alkali land.

[0023] This invention replaces the salt deposits on the surface of saline-alkali land in greenhouses with high-quality topsoil that is unusable after being stripped during construction. This creates a fertile layer suitable for crop growth on the saline-alkali land surface, achieving effective utilization of the topsoil. By setting up isolation barriers and integrating irrigation and drainage, it solves the problem of topsoil salinization previously faced by greenhouses in saline-alkali land. This scientifically protects the restored high-quality topsoil while simultaneously addressing a series of issues such as water waste and groundwater pollution. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram illustrating a method for constructing a fertile layer in a greenhouse on saline-alkali land using high-quality topsoil resources.

[0026] Figure 2 A side vertical distribution diagram of a method for constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources;

[0027] Figure 3 A schematic diagram of the isolation and drainage components for a method of constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources;

[0028] Figure 4 Diagram of the irrigation section and central controller structure for a method of constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources;

[0029] In the diagram: 1. Greenhouse; 2. High-quality topsoil; 3. Corrugated isolation plate; 3-1. Connecting hole; 3-2. Topsoil anti-slip triangular plate; 4. C-type drainage pipe; 4-1. Upper pipe opening; 4-2. Lower pipe opening; 5. Water collection tank; 5-1. Water level monitor; 6. Irrigation control components; 6-1. Mixing tank; 6-2. Salt content monitor; 6-3. One-way solenoid valve one; 6-4. Solenoid valve two; 6-5. Solenoid valve three and integrated water pump assembly; 6-6. Sensor wire; 7. Central controller; 8. Water supply pipe; 9. Water delivery pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a method for constructing a fertile layer in a saline-alkali greenhouse using topsoil resources, and for preventing salinization of high-quality topsoil through specific irrigation and drainage methods, thereby achieving scientific utilization of topsoil, water conservation and salt control, and efficient use of water and fertilizer. Specifically, it involves returning high-quality topsoil to the saline-alkali land in the greenhouse, physically separating the high-quality topsoil layer from the original soil layer to block deep salinization, and then combining this with an integrated water and fertilizer irrigation and drainage system to construct a fertile layer on the soil surface, thereby achieving scientific utilization of topsoil resources and long-term soil management.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-4 As shown, this invention provides a method for constructing a fertile layer in a saline-alkali land greenhouse using topsoil resources, mainly comprising three parts: an isolation section, a drainage section, and an irrigation section. The isolation section includes a corrugated isolation plate 3, a connecting hole 3-1, and a topsoil anti-slip triangular plate 3-2; the drainage section includes a C-shaped drainage pipe 4, an upper pipe opening 4-1, a lower pipe opening 4-2, and a water collection tank 5; the irrigation section includes a water collection tank 5, a water level monitor 5-1, an irrigation control component 6, a mixing tank 6-1, a salinity monitor 6-2, a one-way solenoid valve 6-3, a two-way solenoid valve 6-4, a three-way solenoid valve, and a water pump integrated component 6-5, a sensor line 6-6, a central controller 7, a water supply pipe 8, and a water delivery pipe 9.

[0034] Specifically, it includes a corrugated isolation plate 3, which is a sheet-like structure spliced ​​together. It is located below the high-quality topsoil 2 and above the original saline-alkali soil to separate the two soil layers. The upper peak of the corrugated plate has small connecting holes 3-1 and topsoil anti-slip triangular plates 3-2, which are evenly distributed. The lower end of the corrugated isolation plate 3 is connected to a C-shaped drainage pipe 4. The lower end of the C-shaped drainage pipe 4, 4-1, is connected to a water collection tank 5. A water level monitor 5-1 is arranged in one corner of the water collection tank 5, and its lower end is connected to the water supply pipe 8 of the facility greenhouse 1. A mixing tank 6-1 is set in the middle of the water supply pipe 8. The upper end of the mixing tank 6-1 is connected to the water delivery pipe 9. A salt content monitor 6-2 is installed inside the mixing tank 6-1. A one-way solenoid valve 6-3 is installed between the mixing tank 6-1 and the collection tank 5. A solenoid valve 6-4 is installed between the mixing tank 6-1 and the water supply pipe 9. A solenoid valve 6-3 and an integrated water pump assembly 6-5 are installed at the outlet of the mixing tank 6-1. A central controller 7 is also installed at the upper end of the mixing tank 6-1 near the ground surface. It is connected to the one-way solenoid valve 6-3, the solenoid valve 6-4, the solenoid valve 6-3, and the integrated water pump assembly 6-5 via sensor lines 6-6. In addition, the water supply pipe 9 is located vertically on one side of the facility greenhouse 1, and the water supply pipe 8 is located in the middle of the greenhouse.

[0035] The specific deployment process is as follows:

[0036] The first step is to select greenhouse 1, which has a relatively severe salinization problem, and peel off the top layer of soil with heavy salt accumulation, to a depth of approximately 60-100cm (the exact depth needs to be determined based on the root depth of the crops grown there). After removing the salt-accumulated soil, proceed as follows... Figure 1-4 The structure shown represents a structural modification of greenhouse 1.

[0037] The second step is to lay the corrugated isolation board 3. The isolation board used in this invention is made of polyethylene plastic sheet, which has advantages such as widespread material application, low cost, simple processing, and long service life. It is estimated that the corrugated isolation board 3 can be used for more than ten years after being buried in the soil. The finished corrugated isolation board 3 is a 2*3m sheet (the specific size can be customized according to the specific size of the greenhouse 1). It has connecting holes 3-1 and topsoil anti-slip triangular plates 3-2 arranged on it. The connecting holes 3-1 are located on the upper peak surface of the corrugated isolation board 3, and their main functions are twofold: first, to facilitate vertical air circulation in the soil pores; and second, to provide a channel for the migration and activity of microorganisms in the soil, thereby improving soil structure, promoting soil microbial activity, and preventing soil compaction. Furthermore, because the connecting holes 3-1 are located on the upper peak surface, they can effectively prevent a large amount of infiltrated water from flowing below the corrugated isolation board 3. The anti-slip triangular plates 3-2 mainly prevent the backfilled high-quality topsoil 2 from sliding and being lost horizontally. In addition, the present invention fully considers and utilizes the gravitational potential energy of natural water. The lower peak surface of the corrugated isolation plate 3 is mainly used for drainage of the high-quality topsoil cover layer. Under the action of gravitational potential energy, the excess water in the cover layer will automatically seep into the lower peak surface of the corrugated isolation plate 3 after contacting it, and flow along the U-shaped area of ​​the lower peak surface to the C-shaped drainage pipe 4.

[0038] The third step is to lay the C-shaped drainage pipe 4, which is made of PVC pipe. The two ends of the C-shaped drainage pipe 4 have a height difference; one side of the pipe wall has a 2-3cm opening. During installation, the opening is positioned above the C-shaped drainage pipe 4 to ensure that seepage water flowing from the lower peak of the corrugated isolation plate 3 can enter the C-shaped drainage pipe 4 through the opening. Simultaneously, the C-shaped drainage pipe 4 is not laid parallel to the horizontal plane; its lower end 4-2 must be located on the lower horizontal plane and connected to the collection tank 5. During installation, the relative positions of the corrugated isolation plate 3, the C-shaped drainage pipe 4, and the collection tank 5 need to be considered; that is, the end 5 biased towards the collection tank 5 should be lower than the other end. This ensures that water seeping onto the corrugated isolation plate 3 can flow along the lower peak of the corrugated isolation plate 3 to the C-shaped drainage pipe 4, and then through the C-shaped drainage pipe 4 to the collection tank 5. The upper end 4-1 of the C-type drain pipe 4 is closed, and an isolation net is installed at the lower end 4-2. Its main function is to prevent solids inside the C-type drain pipe 4 from entering the water collection tank 5.

[0039] The fourth step is to excavate a water collection tank 5, located on one side of the facility greenhouse 1, horizontally lower than the C-shaped drainage pipe 4, and reinforced internally with concrete. A water level monitor 5-1 needs to be installed in one corner of the water collection tank 5 to monitor the water level changes in the tank after drainage from the facility greenhouse 1. When the water level exceeds the safe level, the water in the water collection tank 5 needs to be scientifically treated in conjunction with the central controller 7, specifically including two treatment methods: reuse and water extraction. A water supply pipe 8 is reserved below the water collection tank 5 near the facility greenhouse 1.

[0040] The fifth step involves deploying the irrigation section and central control assembly of this invention. Because this invention comprehensively considers the protection of high-quality topsoil and addresses four major problems faced by saline-alkali land, it employs a matching integrated water, fertilizer, irrigation, and drainage system to prevent salinization of high-quality topsoil, water waste, and groundwater pollution. Therefore, a mixing tank 6-1 is installed in the middle of the water supply pipeline. The upper end of the mixing tank 6-1 is connected to the water delivery pipeline 9, and a salinity monitor 6-2 is installed inside the mixing tank 6-1. A one-way solenoid valve 6-3 is installed between the mixing tank 6-1 and the collection tank 5, and a solenoid valve 6-4 is installed between the mixing tank 5 and the water delivery pipeline 9. A solenoid valve 6-3 and an integrated water pump assembly 6-5 are installed at the outlet of the mixing tank 6-1. A central controller 7 is also installed near the ground surface at the upper end of the mixing tank 6-1, which is connected to the one-way solenoid valve 6-3, the solenoid valve 6-4, the solenoid valve 6-3, and the integrated water pump assembly 6-5 via sensor lines 6-6. The main function of the mixing tank 6-1 is to detect the salt content of the water discharged from the greenhouse in the collection tank 5 through its internal salt content monitor 6-2. When the salt content meets the crop growth standards of greenhouse 1, the water in the collection tank 5 is used directly for irrigation. When the salt content exceeds the standard, the water in the water supply pipe 9 and the water in the collection tank 5 are mixed in the mixing tank 6-1 to meet the standard before irrigation. The specific control is achieved through components such as the salt content monitor 6-2, one-way solenoid valve 6-3, solenoid valve 6-4, solenoid valve 3, integrated water pump assembly 6-5, sensor wire 6-6, and central controller 7.

[0041] The sixth step is to arrange the water supply pipe 9 and the water supply pipe 8. The water supply pipe 9 is located on one side of the greenhouse 1 and is arranged vertically. Its main function is to transport normal irrigation water. The water supply pipe 8 is located in the middle of the greenhouse, which facilitates the daily irrigation water intake of the greenhouse 1.

[0042] The seventh step is to backfill the high-quality topsoil 2. After all components are arranged, the high-quality topsoil resources are backfilled on top of the corrugated isolation plate 3 until they are flush with the original soil surface.

[0043] The specific application process is as follows:

[0044] 1. Isolation section

[0045] This invention takes into account scientific merit, economic efficiency, simplicity, convenience, and practicality. For the first time, it introduces a waveform isolation plate 3, and through its upper and lower peaks and connecting holes 3-1, it achieves multiple effects with the simplest structure, realizing salt blocking, water control and conservation, and fertilizer utilization.

[0046] Once the topsoil has been backfilled, normal crop planting can begin. At this point, the overall structure of greenhouse 1 is as follows: Figure 1 As shown, the vertical layout is as follows Figure 2As shown, from highest to lowest, the soil layers are: the high-quality topsoil cover zone, the blocking layer (corrugated isolation plate), and the saline soil deposition zone. The high-quality topsoil cover zone is formed by imported high-quality topsoil resources from a third party, while the saline soil deposition zone is the original soil with relatively high salt content. After crop planting, the main roots of the crop are located in the high-quality topsoil cover zone. Due to evaporation, the salt in the saline soil deposition zone will move upwards. However, due to the obstruction of the corrugated isolation plate 3, a large amount of salt will be deposited on the lower surface of the corrugated isolation plate. Although a small portion of salt particles will migrate to the high-quality topsoil cover zone through the connecting holes 3-1 on the corrugated isolation plate 3, their content is significantly reduced. Therefore, the stress of salt on the crop is greatly reduced.

[0047] 2. Drainage section

[0048] After routine crop irrigation, water seeps down through soil pores. In this invention, after irrigation, the water seeps down to the fault layer and flows to the lower peak of the corrugated isolation plate. The water then flows sequentially into the C-shaped drainage pipe 4 and the collection tank 5 for secondary utilization. On the other hand, when fertilizing the greenhouse 1, aside from fertilizer losses due to ammonia volatilization, most of the N, P, and K elements that are not utilized by the crops dissolve in the water and flow to the lower peak of the corrugated isolation plate 3. This water then enters the collection tank 5 through the C-shaped drainage pipe 4, instead of migrating to deeper soil layers to cause eutrophication and groundwater pollution. Furthermore, N, P, and K elements entering the collection tank 5 can form fertigation and be reused in irrigation, significantly improving fertilizer utilization.

[0049] 3. Irrigation section

[0050] Once the drainage flows into the collection tank 5, the water in the collection tank 5 can be reused. This is controlled by the central controller 7, and there are three main irrigation methods:

[0051] The first irrigation method utilizes the water in the collection tank 5 for irrigation. In this invention, the water in the collection tank 5 is also given priority. At this time, the salt content of the water in the collection tank 5 needs to be detected by the salt content monitor 6-2 to meet the crop growth standards of the facility greenhouse 1. When irrigating using the first method, the one-way solenoid valve 1 6-3 is opened, the solenoid valve 2 6-4 is closed, and the solenoid valve 3 and the integrated water pump assembly 6-5 are opened. The water in the collection tank 5 will be directly pumped into the water supply pipe 8.

[0052] The second irrigation method utilizes the water in the water delivery pipe 9 for irrigation. This method is used in special circumstances such as when the water collection tank 5 is empty or the greenhouse requires regular water irrigation. When using the second method, the one-way solenoid valve 1 6-3 is closed, the solenoid valve 2 6-4 is open, and the integrated solenoid valve 3 and water pump assembly 6-5 is open, allowing the water in the water delivery pipe 9 to be directly supplied to the water supply pipe 8.

[0053] The third irrigation method utilizes water from both the water supply pipe 9 and the collection tank 5 simultaneously. In reality, the water volume in the collection tank 5 is generally small, and when using the first method, the water volume is insufficient to meet the irrigation needs. Therefore, it's necessary to utilize water from the water supply pipe 9 simultaneously. This requires opening one-way solenoid valve 6-3, solenoid valve 6-4, and the integrated solenoid valve and pump assembly 6-5. Water from both the collection tank 5 and the water supply pipe 9 is simultaneously pumped into the water supply pipe 8. Another scenario is when the salinity of the drainage from the collection tank 5 exceeds the standard. In this case, one-way solenoid valve 6-3 and solenoid valve 6-4 need to be opened, using water from the water supply pipe 9 to dilute the water flowing from the collection tank 5 in the mixing tank 6-1. Once the salinity reaches the standard, solenoid valve 6-3 and the integrated pump assembly 6-5 are then opened to pump water into the water supply pipe 8.

[0054] In this invention, the water supply pipe 8 is located in the center of the greenhouse 1. Growers can draw water from the water supply pipe 8 for irrigation. The irrigation methods are applicable to drip irrigation, root irrigation, etc.

[0055] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for constructing a fertile layer in a greenhouse on saline-alkali land using topsoil resources, characterized in that: The application relates to a salt-alkali soil isolation, drainage and irrigation device for a greenhouse, which comprises an isolation part, a drainage part and an irrigation part. The isolation part comprises isolation plates which are arranged between the lower part of surface soil in the greenhouse and the upper part of original salt-alkali soil, the isolation plates are sheet-shaped and are spliced with each other, the isolation plates are provided with communicating holes and surface soil anti-skid triangular plates, the drainage part comprises C-shaped drainage pipes and a water collecting pool, the water outlet end of the isolation plate is connected with the C-shaped drainage pipe, and the lower end of the C-shaped drainage pipe is connected with the water collecting pool, the irrigation part comprises upper water pipes, a water mixing box, a water conveying pipe, a water irrigation control assembly and a central controller, the bottom of the water collecting pool is connected with the upper water pipes in the greenhouse, the middle part of the upper water pipes is provided with the water mixing box, the upper end of the water mixing box is connected with the water conveying pipe, and the central controller is used for controlling the switch of the water irrigation control assembly so as to provide irrigation water for the greenhouse.

2. The method for constructing fertile layer in greenhouse of saline-alkali soil by using topsoil resources according to claim 1, characterized in that: The isolation plates are wave-shaped isolation plates, the communicating holes are uniformly distributed on the peak surface of the wave-shaped isolation plates, and the surface soil anti-skid triangular plates are also uniformly distributed on the peak surface of the wave-shaped isolation plates, and the wave-shaped isolation plates are made of polyethylene sheets.

3. The method for constructing fertile layer in greenhouse of saline-alkali soil by using topsoil resources according to claim 1, characterized in that: The isolation plates on the two sides of the middle line of the greenhouse are symmetrically and obliquely arranged, the horizontal height of one end of the isolation plates close to the middle line of the greenhouse is higher than that of the other end away from the middle line of the greenhouse, and the port of the other end of the isolation plates away from the middle line of the greenhouse is connected with the C-shaped drainage pipe.

4. The method for constructing fertile layer in greenhouse of saline-alkali soil by using topsoil resources according to claim 1, characterized in that: The two ends of the C-shaped drainage pipe have a height difference, the horizontal height of the lower end close to the water collecting pool is lower than that of the upper end away from the water collecting pool, and the lower end is provided with an anti-blocking protective net.

5. The method for constructing fertile layer in greenhouse of saline-alkali soil by using topsoil resources according to claim 1, characterized in that: One corner of the water collecting pool is provided with a water level monitor, the water mixing box is provided with a salt content monitor, the water irrigation control assembly comprises a one-way electromagnetic valve one, an electromagnetic valve two, an electromagnetic valve three and a water pump integrated assembly, the one-way electromagnetic valve one is arranged between the water mixing box and the water collecting pool, the electromagnetic valve two is arranged between the water mixing box and the water conveying pipe, the outlet end of the water mixing box is provided with an electronic valve umbrella and the water pump integrated assembly, the upper end of the water mixing box close to the ground is provided with the central controller, and the central controller is connected with the one-way electromagnetic valve one, the electromagnetic valve two, the electromagnetic valve three and the water pump integrated assembly through sensing lines.

6. The method for constructing fertile layer in greenhouse of saline-alkali soil by using topsoil resources according to claim 1, characterized in that: The water conveying pipe is vertically arranged on one side of the greenhouse, and the upper water pipes are arranged at the middle position of the greenhouse and are laid along the length direction of the greenhouse. The surface soil resources are arranged in the greenhouse as follows: In the first step, the salt-alkali soil on the surface is stripped to a depth of 60-100 cm, and then the isolation part, the drainage part and the irrigation part are arranged. Second step, lay the wave-shaped isolation board, the finished product of the wave-shaped isolation board is 2 3m, and the wave-shaped isolation boards are sequentially and mutually spliced and laid above the original saline-alkali soil. Under the action of gravitational potential energy, the excess water in the soil layer automatically penetrates into the lower peak surface of the wave-shaped isolation board after contacting the wave-shaped isolation board, and flows to the C-shaped drainage pipe along the U-shaped area of the lower peak surface. The third step is to lay the C-shaped drainage pipe. The opening of the drainage pipe is above the C-shaped drainage pipe. The infiltrated water from the lower peak surface of the wave-shaped isolation plate can enter the C-shaped drainage pipe from the opening. When laying, the relative positions of the wave-shaped isolation plate, the C-shaped drainage pipe, and the water collecting pool need to be considered. That is, the end of the C-shaped drainage pipe that is closer to the water collecting pool should be lower than the other end, so as to ensure that the water infiltrated on the wave-shaped isolation plate can flow along the lower peak surface of the wave-shaped isolation plate to the C-shaped drainage pipe, and then flow to the water collecting pool through the C-shaped drainage pipe. The upper end of the C-shaped drainage pipe is in a closed state. The fourth step is to dig the water collecting pool. The water collecting pool is located on one side of the greenhouse and is lower than the C-shaped drainage pipe in horizontal position. The inside is reinforced with concrete. When arranging, a water level monitor needs to be configured at a corner of the water collecting pool to monitor the water level change in the water collecting pool after the water is drained from the greenhouse in real time. When the water level exceeds the safe water level, the water in the water collecting pool needs to be treated in combination with the central controller. The upper water pipeline is reserved near the facility greenhouse below the water collecting pool. The fifth step is to arrange the irrigation part and the central control component. The salt monitor inside the mixing tank detects the salt content of the water drained from the greenhouse in the water collecting pool. When the salt content meets the standard for the growth of greenhouse crops, the water in the water collecting pool is directly used for irrigation. When the salt content exceeds the standard, the water in the water pipeline and the water in the water collecting pool are mixed in the mixing tank to meet the standard before irrigation. The sixth step is to arrange the water delivery pipeline and the upper water pipeline. The water delivery pipeline is vertically arranged on one side of the greenhouse. The upper water pipeline is arranged at the middle position inside the greenhouse, which is convenient for daily irrigation and water taking in the greenhouse. The seventh step is to return the surface soil to the top of the wave-shaped isolation plate after all the components are arranged, until it is flush with the original soil surface.

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