Self-pressure type water-saving irrigation method based on multiple layers of water bags

Abstract

The invention belongs to the technical field of irrigation, and particularly relates to a self-pressure type water-saving irrigation method based on multiple layers of water bags, which comprises the following steps: S1, setting sowing row parameters, and determining the sowing row width and row spacing of crops; s2, arranging an irrigation system; s3, crops are sown, wherein the crops are sown along the two sides of the irrigation rows; s4, irrigation operation is conducted, the pressurizing unit and the irrigation unit are started at the same time, the irrigation unit forms stored water by means of the pressurizing unit and increases water pressure, and the irrigation unit seeps water to the far ends of the soil on the two sides by means of increase of the water pressure. The irrigation system is adopted to replace a common drip irrigation belt, the irrigation system adopts a double-layer water bag structure with lower-layer irrigation and upper-layer pressurization, on the premise that the water supply amount of a single drip irrigation belt is not increased, the overall water storage pressurization of the irrigation system is achieved, the water pressure is higher, water is provided for crops located at the edge of a seeding row, and the irrigation efficiency is improved. And meanwhile, the problem of pipe explosion caused by internal high pressure of the drip irrigation tape is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of irrigation, and particularly relates to a self-pressure water-saving irrigation method based on a multilayer water bag. BACKGROUND

[0002] In the field of crop planting, the seeding row width parameter directly affects the crop growth quality and yield formation. Taking wheat planting as an example, the traditional dense planting mode adopts a 20cm seeding row width and a 10cm row spacing. The narrow row spacing leads to poor field ventilation and light transmission, increasing the probability of occurrence of air-borne diseases such as powdery mildew and rust. Therefore, the wide-row planting mode is generally adopted at present, and the seeding row width is widened to 40cm and the row spacing is increased to 20cm. Although the width required for wheat planting per unit area does not change, the ventilation effect is better due to the wider row spacing, so that the plant spacing of wheat can be reduced, the planting density of millet is increased, and the total yield is improved under the condition of constant unit yield.

[0003] The traditional dense planting mode adopts ordinary drip irrigation tape, and the penetration area width of the drip irrigation tape is about 20cm. If the ordinary drip irrigation tape is used on the seeding row with a 40cm seeding row width, the water flow penetration force of the ordinary drip irrigation tape is insufficient, and water cannot be supplied to the wheat at the edge of the seeding row. However, if the pressure at the input end of the drip irrigation tape is directly increased, the water pressure limit of the drip irrigation tape may be exceeded, and the problem of pipe explosion may occur. SUMMARY

[0004] In order to solve the problems existing in the prior art, the application provides a self-pressure water-saving irrigation method based on a multilayer water bag, which adopts an irrigation system instead of ordinary drip irrigation tape. The irrigation system adopts a double-layer water bag structure of lower irrigation and upper pressure increase. Under the premise of not increasing the water supply of a single drip irrigation tape, the water storage and pressure increase of the whole irrigation system are realized, water is provided for crops located at the edge of the seeding row, and the problem of pipe explosion caused by high pressure in the drip irrigation tape is avoided.

[0005] The specific technical scheme adopted by the application is as follows:

[0006] A self-pressure water-saving irrigation method based on a multilayer water bag, the irrigation method comprising the following steps:

[0007] S1, setting a seeding row parameter to determine the seeding row width and row spacing of crops;

[0008] S2, arranging an irrigation system, the irrigation system comprising a lower irrigation unit and an upper pressure increasing unit, and the irrigation system is arranged at the center line position of the seeding row;

[0009] S3, seeding crops, and seeding crops along both sides of the irrigation system;

[0010] S4, irrigation operation, water is simultaneously supplied to the pressurizing unit and the irrigation unit, the irrigation unit forms water storage and increases water pressure by means of the pressurizing unit, and the irrigation unit irrigates the soil on both sides by means of the increase of water pressure.

[0011] The irrigation system is arranged on the ground surface, the irrigation system comprises a capsule, a partition plate is arranged in the hollow chamber of the capsule, the hollow chamber of the capsule is divided into an upper pressurizing unit and a lower irrigation unit by means of the partition plate, a through hole for connecting the pressurizing unit and the irrigation unit is arranged on the partition plate, a float valve is arranged on the output end of the through hole in the irrigation unit, and drip irrigation holes are arranged on both sides of the capsule where the irrigation unit is located.

[0012] The irrigation system is arranged underground, the irrigation unit comprises a first film, a first framework and a first drip irrigation belt, the first film wraps the first framework and the first drip irrigation belt and forms an irrigation chamber, the first framework is located at the bottom of the irrigation chamber and forms a framework layer of the irrigation chamber, and the first drip irrigation belt is arranged above the first framework, irrigation holes are arranged on both sides of the irrigation chamber on the first film.

[0013] The pressurizing unit is arranged in the irrigation chamber and above the first drip irrigation belt, the pressurizing unit comprises a second film, a second framework and a second drip irrigation belt, the second film wraps the second framework and the second drip irrigation belt and forms a pressurizing chamber, the second framework is located at the bottom of the pressurizing chamber and forms a framework layer of the pressurizing chamber, and the second drip irrigation belt is arranged above the second framework, and a water storage hole is arranged at the bottom of the pressurizing chamber on the second film.

[0014] The specific steps of step S2 are as follows:

[0015] S2, burying the irrigation system, the irrigation system comprises a lower irrigation unit and an upper pressurizing unit, a pre-buried trench is excavated along the length direction of the seeding row at the center line position of the seeding row, the irrigation unit and the pressurizing unit are sequentially laid, and then the pre-buried trench is covered and filled with soil to form an irrigation row;

[0016] The specific construction method of the irrigation system is as follows:

[0017] S201, preparing a geogrid, trimming the geogrid into a strip-shaped grid strip, each grid strip having at least one column of grid holes, and a plurality of groups of grid strips being laterally overlapped and stacked to form a framework in a net rack shape;

[0018] S202, laying a first film along the center line position of the pre-buried trench to the soil surface, and then pressing the first film to the bottom of the pre-buried trench by using a pressing wheel, so that the first film is attached to the side wall and the bottom of the pre-buried trench and forms a U-shaped structure;

[0019] S203, then a group of skeletons is laid into the U-shaped groove formed by the first film and a first drip irrigation belt is laid on the first skeleton, and the first drip irrigation belt is located in the middle part of the pre-buried trench;

[0020] S204, the second film is laid along the middle line of the pre-buried trench to the soil surface, and then a pressing wheel is used to press the second film above the first drip irrigation belt;

[0021] S205, then another group of skeletons is laid into the U-shaped groove formed by the second film and a second drip irrigation belt is laid on the second skeleton, and the second drip irrigation belt is 10-20 cm away from the opening of the pre-buried trench;

[0022] S206, first, the two sides of the second film are folded inward and lapped onto the surface of the second drip irrigation belt, and then the two sides of the first film are folded inward and lapped onto the surface of the second film, the chamber formed by the second film is a pressurized chamber, and the chamber formed by the first film is an irrigation chamber.

[0023] The upper geogrid of the skeleton in step S201 is arranged in a staggered manner with the lower geogrid, and the grid frame of the upper geogrid is lapped with the grid hole of the lower geogrid.

[0024] The irrigation system is also provided with an observation air vent, and the observation air vent is arranged as follows: every 10-20 m, the irrigation row is dug and the first film is exposed, the pit formed by the digging is an observation air vent, and the first film and the second film at the observation air vent are uncovered to expose the irrigation chamber.

[0025] The specific operation method of the irrigation operation includes the following steps:

[0026] S401, when the crops are in the initial growth period, the input ends of the irrigation unit and the pressurization unit are respectively connected with a fresh water pump, and the fresh water pump supplies fresh water to the irrigation unit and the pressurization unit;

[0027] S402, when the crops are in the middle and later growth period, the input end of the irrigation unit is connected with the fresh water pump, and the input end of the pressurization unit is connected with a salt water pump, the fresh water pump supplies fresh water to the irrigation unit, and the salt water pump supplies salt water to the pressurization unit;

[0028] S403, when the crops are in the topdressing period, the input end of the irrigation unit is connected with the fresh water pump, and the input end of the pressurization unit is connected with a liquid fertilizer pump, the fresh water pump supplies fresh water to the irrigation unit, and the liquid fertilizer pump supplies liquid fertilizer to the pressurization unit.

[0029] The salt content of the fresh water is less than 1.5 g / L, and the salt content of the salt water is 3-5 g / L.

[0030] The beneficial effects of the present application are:

[0031] 1. The present invention adopts an irrigation system instead of an ordinary drip irrigation belt. The irrigation system adopts a double-layer water bag structure with lower irrigation and upper pressurization. Through the self-pressure design, the overall water storage and pressurization of the irrigation system is achieved without increasing the water supply of a single drip irrigation belt, avoiding the problem of pipe burst caused by internal high pressure of the drip irrigation belt, improving the stability of the system while providing water guarantee for dense planting.

[0032] 2. The underground irrigation system of this invention can directly irrigate the root system of crops. It is simple to set up and has low cost, requiring only two sets of membranes and several geogrids. The geogrids are also recyclable. Furthermore, compared to traditional drip irrigation tape deployment, it does not cause increased soil damage. Only pre-buried trenches are required, and the first and second membranes of the irrigation system can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of the method of the present invention;

[0034] Figure 2 This is a structural diagram of an irrigation system according to a specific embodiment 1;

[0035] Figure 3 Schematic diagram of the positional relationship between the irrigation system and crops in specific embodiment 1;

[0036] Figure 4 This is a schematic diagram of the structure of the irrigation system when buried in specific embodiment 2;

[0037] Figure 5 This is a schematic structural diagram of the landfill irrigation system in specific embodiment 2;

[0038] Figure 6 This is a schematic diagram of the positional relationship between the irrigation system and the crop root system in specific embodiment 2;

[0039] Figure 7 This is a schematic diagram of the top view of the sowing rows and irrigation rows in specific embodiment 2;

[0040] In the accompanying drawings, 1. first film, 2. first frame, 3. first drip irrigation belt, 4. second film, 5. second frame, 6. second drip irrigation belt, 7. observation vent, 8. irrigation hole, 9. water storage hole, 10. capsule, 11. partition, 12. through hole, 13. float valve, 14. drip irrigation hole, A. sowing row, B. spacing row, C. irrigation row. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0042] Specific embodiments, such as Figure 1As shown, the application provides a multi-layer water bag self-pressure water-saving irrigation method, which comprises the following steps:

[0043] S1, set the seeding row A parameter, determine the seeding row A width and row spacing of the crop;

[0044] S2, arrange the irrigation system, which comprises the lower irrigation unit and the upper booster unit, and arrange the irrigation system at the center line position of the seeding row A;

[0045] S3, seed the crop, seed the crop along both sides of the irrigation system;

[0046] S4, irrigation operation, water is supplied to the booster unit and the irrigation unit at the same time, the irrigation unit forms water storage and increases water pressure with the help of the booster unit, and the irrigation unit irrigates the soil on both sides with the help of the increase of water pressure.

[0047] The conventional dense planting mode uses ordinary drip irrigation tape, and the penetration area of the drip irrigation tape is limited in width. If it is used on the wheat seeding row A with wider width, the water penetration force of the ordinary drip irrigation tape is insufficient, and the water cannot be sent to the crops at the edge of the seeding row A. However, if the pressure at the input end of the drip irrigation tape is directly increased, it may exceed the water pressure bearing limit of the drip irrigation tape, causing the problem of pipe explosion.

[0048] Therefore, the irrigation system is used instead of the ordinary drip irrigation tape in the application, and the irrigation system adopts the double-layer water bag structure of lower irrigation and upper booster. Through self-pressure design, the water storage and pressure increase of the whole irrigation system are realized without increasing the water supply of a single drip irrigation tape, the problem of pipe explosion caused by high pressure in the drip irrigation tape is avoided, the system stability is improved, and water supply is ensured for dense planting.

[0049] As shown in the figure, Figures 2-3 The irrigation system is arranged on the ground surface, and the irrigation system comprises a bag body 10, a partition plate 11 is arranged in the hollow chamber of the bag body 10, the hollow chamber of the bag body 10 is divided into an upper booster unit and a lower irrigation unit by the partition plate 11, a through hole 12 for connecting the booster unit and the irrigation unit is arranged on the partition plate 11, a floating ball valve 13 is arranged on the output end of the through hole 12 in the irrigation unit, and drip irrigation holes 14 are arranged on both sides of the bag body 10 where the irrigation unit is located.

[0050] Specific embodiment 1: when irrigating, water is injected into the irrigation unit and the booster unit at the same time, the water inflow rate and the water outflow rate of the irrigation unit are approximately the same, but because the booster unit is connected with the irrigation unit, the upper booster unit will continue to supply water to the irrigation unit, and a water storage state is formed in the irrigation unit, and as the water level in the irrigation unit rises, the water pressure also increases, so the water flow discharged by the irrigation system can be sprayed horizontally at a farther distance, and water can be provided to the crops located at the edge of the seeding row A. When the irrigation unit is full of water, the water level in the irrigation unit forms a dynamic balance under the action of the floating valve, and is always at a critical point, so that the irrigation unit is always in a high-pressure state, and water can be sprayed far away, and the risk of the water bag being burst by the high-pressure water source is also avoided; when it is necessary to provide water to the plants nearby, water can be injected into the irrigation unit only.

[0051] In addition, a fixing block can be arranged below the capsule 10 to fix the position of the capsule 10.

[0052] The specific operation method of the irrigation operation includes the following steps:

[0053] S401, when the crops are in the early growth stage, the input ends of the irrigation unit and the booster unit are connected with the fresh water pump respectively, and the fresh water pump supplies fresh water to the irrigation unit and the booster unit respectively;

[0054] S402, when the crops are in the middle and late growth stage, the input end of the irrigation unit is connected with the fresh water pump, and the input end of the booster unit is connected with the salt water pump, the fresh water pump supplies fresh water to the irrigation unit, and the salt water pump supplies salt water to the booster unit;

[0055] S403, when the crops are in the topdressing period, the input end of the irrigation unit is connected with the fresh water pump, and the input end of the booster unit is connected with the liquid fertilizer pump, the fresh water pump supplies fresh water to the irrigation unit, and the liquid fertilizer pump supplies liquid fertilizer to the booster unit.

[0056] The salt content of the fresh water is less than 1.5 g / L, and the salt content of the salt water is 3-5 g / L.

[0057] The fresh water supplied in the early growth stage guarantees the root development of the seedlings; the introduction of salt water in the middle and late growth stage promotes the expression of the stress resistance of the wheat, and at the same time, the salt water inhibits the growth of weeds and improves the yield of the wheat; in the topdressing period, nutrients are directly delivered by the liquid fertilizer pump to improve the fertilizer utilization rate and the absorption efficiency of the crops, and at the same time, the liquid fertilizer will first enter the irrigation chamber to form dilution with the fresh water, so as to avoid too high concentration of the liquid fertilizer.

[0058] Specific embodiment 2: the irrigation system in specific embodiment 2 is arranged underground,

[0059] For example, Figures 4-7As shown, the irrigation unit includes a first film 1, a first framework 2, and a first drip irrigation belt 3. The first film 1 wraps the first framework 2 and the first drip irrigation belt 3 and forms an irrigation chamber. The first framework 2 is located at the bottom of the irrigation chamber and forms a framework layer of the irrigation chamber. The first drip irrigation belt 3 is arranged above the first framework 2. Irrigation holes 8 are arranged on the first film 1 on both sides of the irrigation chamber.

[0060] The framework layer provides support strength for the irrigation chamber, preventing soil pressure from causing the chamber to collapse and avoiding the irrigation chamber built by the first film 1 from collapsing and failing to play a role in water storage and pressure boosting. The irrigation unit directs water to the soil on both sides of the seeding row A through the irrigation holes 8 on both sides, and cooperates with the water pressure boost of the pressure boost unit to achieve long-distance infiltration irrigation and avoid water shortage for the crops on the edge of the seeding row A.

[0061] As shown, Figures 4-6 The pressure boost unit is arranged in the irrigation chamber and above the first drip irrigation belt 3. The pressure boost unit includes a second film 4, a second framework 5, and a second drip irrigation belt 6. The second film 4 wraps the second framework 5 and the second drip irrigation belt 6 and forms a pressure boost chamber. The second framework 5 is located at the bottom of the pressure boost chamber and forms a framework layer of the pressure boost chamber. The second drip irrigation belt 6 is arranged above the second framework 5. Water storage holes 9 are arranged on the second film 4 at the bottom of the pressure boost chamber.

[0062] After the pressure boost unit is independently watered, water is supplied to the irrigation chamber through the water storage holes 9, forming dynamic pressure conduction of upper water storage and pressure boosting and lower infiltration irrigation, and gradually increasing the water pressure of the irrigation chamber with the water storage amount, thereby avoiding the impact of instantaneous high pressure on the first drip irrigation belt 3 and causing damage.

[0063] In a specific embodiment 2, the specific control method of the irrigation unit and the pressure boost unit is as follows: first, water is injected into the drip irrigation belts of the irrigation unit and the pressure boost unit at the same time. The water level in the irrigation chamber continues to rise, the water flow discharged by the irrigation system has stronger infiltration force, and the horizontal distance of water flow infiltration is farther. When the water level reaches the required height, that is, the water pressure at this time can supply water flow to the edge of the seeding row A, the water level change is observed through the air vent 7, the water inflow of the second drip irrigation belt 6 of the pressure boost unit is adjusted, the drainage speed and the water storage speed of the irrigation chamber are dynamically balanced, and the water level is maintained at this height. When the irrigation is completed, the water supply to the first drip irrigation belt 3 and the second drip irrigation belt 6 is stopped.

[0064] Taking wheat as an example, the width of the seeding row A is determined to be 40-50 cm, and the row spacing is 15-25 cm. Since the root system of wheat is mainly distributed near the soil depth of 30-50 cm, the depth of the pre-buried trench is set to 50 cm, and the width of the pre-buried trench is set to 5-10 cm, so that the drip irrigation belt and the geogrid can be placed in the pre-buried trench.

[0065] The irrigation holes 8 of the irrigation chamber are mainly distributed near the soil depth of 40 cm, so as to ensure that the water flow can penetrate to the main water absorption area of the crop root system.

[0066] The irrigation system is located deep underground, can directly deliver water to the vicinity of the crop root system, and can also reduce water evaporation compared with the surface arrangement of the drip irrigation belt.

[0067] The specific steps of step S2 are as follows:

[0068] S2, burying the irrigation system, the irrigation system comprising a lower irrigation unit and an upper booster unit, at the middle line position of the seeding row A, excavating a pre-buried trench along the length direction of the seeding row A, sequentially laying the irrigation unit and the booster unit, then carrying out the earth covering and filling operation on the pre-buried trench and forming the irrigation row C;

[0069] As shown in the figure, the specific construction method of the irrigation system is as follows: Figures 4-5

[0070] S201, preparing the geogrid, trimming the geogrid into a strip-shaped grid strip, each grid strip having at least one column of grid holes, a plurality of grid strips being laterally lapped and stacked to form a framework of a net rack structure;

[0071] S202, laying the first film 1 along the middle line position of the pre-buried trench to the soil surface, then pressing the first film 1 to the bottom of the pre-buried trench by using the pressing wheel, the first film 1 being attached to the side wall and the bottom of the pre-buried trench and forming a U-shaped structure;

[0072] S203, then laying a group of frameworks into the U-shaped groove formed by the first film 1 to form the first framework 2, and laying the first drip irrigation belt 3 on the first framework 2, the first drip irrigation belt 3 being located in the middle part of the pre-buried trench;

[0073] S204, laying the second film 4 along the middle line position of the pre-buried trench to the soil surface, then pressing the second film 4 above the first drip irrigation belt 3 by using the pressing wheel;

[0074] S205, then laying another group of frameworks into the U-shaped groove formed by the second film 4 to form the second framework 5, and laying the second drip irrigation belt 6 on the second framework 5, the second drip irrigation belt 6 being 10-20 cm away from the opening 10 of the pre-buried trench;

[0075] S206, folding the two sides of the second film 4 inward and lapping onto the surface of the second drip irrigation belt 6, then folding the two sides of the first film 1 inward and lapping onto the surface of the second film 4, the chamber formed by wrapping the second film 4 being a booster chamber, and the chamber formed by wrapping the first film 1 being an irrigation chamber.

[0076] ​The irrigation system in embodiment 2 is simple to build and low in cost, only two groups of membranes and several pieces of geogrids are needed, and the geogrids can be recycled. In addition, compared with the arrangement method of the traditional drip irrigation belt, the degree of soil damage is not increased, only the pre-buried trench needs to be dug, and the first membrane 1 and the second membrane 4 of the irrigation system can be recycled.

[0077] The upper geogrid and the lower geogrid in step S201 are arranged in a staggered manner, and the grid frame of the upper geogrid is connected with the grid hole of the lower geogrid.

[0078] The staggered geogrids can improve the anti-deformation ability of the overall structure of the skeleton, adapt to soil settlement and external pressure, and due to the good water permeability, even if the grid frame of the upper geogrid partially blocks the grid hole of the lower geogrid, water flow can still pass through the grid hole.

[0079] As shown in Figure 7 The irrigation system is also provided with an observation air vent 7, and the observation air vent 7 is arranged as follows: every 10-20m, the irrigation row C is dug and the first membrane 1 is exposed, the pit formed by digging is the observation air vent 7, and the first membrane 1 and the second membrane 4 at the observation air vent 7 are uncovered to expose the irrigation chamber.

[0080] Since the membrane is a transparent plastic membrane, the water storage and pressure boosting state in the irrigation chamber and the pressure boosting chamber can be observed through the plastic membrane through the observation air vent 7, and excessive water storage is avoided. At the same time, the observation air vent 7 can also play the role of ventilation, avoiding the formation of negative pressure in the irrigation chamber.

Claims

1. A water-saving irrigation method based on multi-layer water bags with self-pressure, characterized in that: The irrigation method comprises the following steps: S1. Set the sowing row parameters to determine the sowing row width and row spacing of the crop; S2. Arrange the irrigation system, which includes a lower-level irrigation unit and an upper-level booster unit. Arrange the irrigation system at the center line of the sowing row. S3, sowing crops, sowing crops along both sides of the irrigation system; S4. Irrigation operation: water is supplied to the boosting unit and the irrigation unit at the same time. The irrigation unit forms water storage and increases water pressure with the help of the boosting unit. The irrigation unit irrigates the soil on both sides with the help of the increased water pressure.

2. The water-saving irrigation method based on multi-layer water bags according to claim 1 is characterized in that: The irrigation system is arranged on the ground surface and comprises a capsule (10). A partition (11) is provided in the hollow chamber of the capsule (10). The hollow chamber of the capsule (10) is divided into an upper-layer pressurizing unit and a lower-layer irrigation unit by means of the partition (11). A through hole (12) for connecting the pressurizing unit and the irrigation unit is provided on the partition (11). A float valve (13) is provided at the output end of the through hole (12) located in the irrigation unit. Drip irrigation holes (14) are provided on both sides of the capsule (10) where the irrigation unit is located.

3. The water-saving irrigation method based on multi-layer water bags according to claim 1, characterized in that: The irrigation system is arranged underground. The irrigation unit comprises a first film (1), a first frame (2) and a first drip irrigation belt (3). The first film (1) wraps the first frame (2) and the first drip irrigation belt (3) to form an irrigation chamber. The first frame (2) is located at the bottom of the irrigation chamber and forms a frame layer of the irrigation chamber. The first drip irrigation belt (3) is placed above the first frame (2). Irrigation holes (8) are provided on both sides of the irrigation chamber on the first film (1).

4. The water-saving irrigation method based on multi-layer water bags and self-pressure type according to claim 3 is characterized in that: The boosting unit is arranged in the irrigation chamber and is located above the first drip irrigation belt (3). The boosting unit comprises a second film (4), a second frame (5) and a second drip irrigation belt (6). The second film (4) wraps the second frame (5) and the second drip irrigation belt (6) to form a boosting chamber. The second frame (5) is located at the bottom of the boosting chamber and forms a frame layer of the boosting chamber. The second drip irrigation belt (6) is draped over the second frame (5). A water storage hole (9) is provided on the second film (4) at the bottom of the boosting chamber.

5. The water-saving irrigation method based on multi-layer water bags self-pressure type according to claim 4, characterized in that: The specific steps of step S2 are: S2. Bury the irrigation system, which includes irrigation units on the lower layer and booster units on the upper layer. Excavate a pre-buried ditch along the length of the sowing row at the center line of the sowing row. Lay the irrigation units and booster units in sequence. Then, cover the pre-buried ditch with soil to form an irrigation row. The specific construction method of the irrigation system is as follows: S201, preparing a geogrid, trimming the geogrid into strip-shaped grid bars, each grid bar having at least one row of grid holes, and stacking and tying multiple groups of grid bars laterally to form a grid-like structure skeleton; S202, laying the first film (1) along the center line of the pre-buried ditch to the soil surface, and then using a pressing wheel to press the first film (1) to the bottom of the pre-buried ditch, so that the first film (1) is attached to the side wall and bottom of the pre-buried ditch to form a U-shaped structure; S203, then laying a set of frames into the U-shaped groove formed by the first film (1) to form a first frame (2), and then laying a first drip irrigation tape (3) on the first frame (2), the first drip irrigation tape (3) being located in the middle of the pre-buried ditch; S204, laying the second film (4) along the center line of the pre-buried ditch to the soil surface, and then using a pressing wheel to press the second film (4) to the top of the first drip irrigation belt (3); S205, then laying another set of frames into the U-shaped groove formed by the second film (4) to form a second frame (5), and then laying a second drip irrigation tape (6) on the second frame (5), with the second drip irrigation tape (6) being 10-20 cm away from the opening of the pre-buried ditch; S206. First, fold both sides of the second film (4) inward and place them on the surface of the second drip irrigation belt (6), and then fold both sides of the first film (1) inward and place them on the surface of the second film (4). The chamber formed by wrapping the second film (4) is the pressurized chamber, and the chamber formed by wrapping the first film (1) is the irrigation chamber.

6. The water-saving irrigation method based on multi-layer water bags and self-pressure type according to claim 5, characterized in that: In step S201 , the upper geogrid layer and the lower geogrid layer of the skeleton are staggered, and the grid frames of the upper geogrid layer are overlapped with the grid holes of the lower geogrid layer.

7. The water-saving irrigation method based on multi-layer water bags and self-pressure type according to claim 3 is characterized in that: The irrigation system is further provided with an observation vent (7). The setting method of the observation vent (7) is as follows: soil is shoveled on the irrigation row at intervals of 10-20 m to expose the first film (1). The pits formed by the shoveling serve as the observation vent (7). The first film (1) and the second film (4) at the observation vent (7) are uncovered to expose the irrigation chamber.

8. The water-saving irrigation method based on multi-layer water bags and self-pressure type according to claim 3 is characterized in that: The specific operation method of the irrigation operation comprises the following steps: S401: When the crops are in the early growth stage, the input ends of the irrigation unit and the boosting unit are connected to the pure water pumps respectively, and the pure water pumps supply fresh water to the irrigation unit and the boosting unit respectively; S402: When the crops are in the middle and late stages of growth, the input end of the irrigation unit is connected to the pure water pump, and the input end of the boosting unit is connected to the salt water pump. The pure water pump supplies fresh water to the irrigation unit, and the salt water pump supplies salt water to the boosting unit. S403. When the crop is in the topdressing period, the input end of the irrigation unit is connected to the pure water pump, and the input end of the boosting unit is connected to the liquid fertilizer pump. The pure water pump supplies fresh water to the irrigation unit, and the liquid fertilizer pump supplies liquid fertilizer to the boosting unit.

9. The water-saving irrigation method based on multi-layer water bags and self-pressure type according to claim 8, characterized in that: The salt content of the fresh water is lower than 1.5 g / L, and the salt content of the salt water is 3-5 g / L.

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