Wheat brackish water supplementary irrigation technology

Abstract

The invention discloses a wheat brackish water supplementary irrigation technology, and relates to the technical field of crop brackish water irrigation. After the opening and closing states of a brackish water pipe and a fresh water drip irrigation pipe are switched for the first time, the surrounding liquid environment with high concentration and high salinity and alkalinity is gradually desalted by fresh water, and the salinity and alkalinity in the surrounding liquid environment are continuously reduced; after the permeability of the semi-permeable membrane is reduced to be within the passable capacity range of the permeable holes of the semi-permeable membrane, the permeability of the semi-permeable membrane is recovered, the brackish water in the brackish water pipe seeps through the semi-permeable membrane again, fluid resistance is generated between the brackish water and the semi-permeable membrane to enable the semi-permeable membrane to recover the outward permeable protrusion phenomenon, and in the same way, sealing of the fresh water drip irrigation pipe is achieved by reversely pulling the sealing piece. The brackish water drip irrigation and the fresh water drip irrigation are switched again, so that the adverse effect caused by salt precipitation and accumulation is reduced, the accurate control over the salt content of the surrounding environment at different growth stages of the wheat is improved, and the main irrigation mode is still brackish water irrigation.

Description

Technical Field

[0001] The invention relates to the technical field of brackish water irrigation for crops, in particular to a brackish water supplementary irrigation technology for wheat. Background Art

[0002] my country's brackish water resources are widely distributed, while freshwater resources are not evenly distributed. Saline-alkali lands are rich in saltwater resources. When irrigating saline-alkali areas for mass production of crops, the conventional practice is to desalinate a large amount of brackish water outside the land. Using freshwater for irrigation throughout the growth period will result in excessively high planting costs and a waste of already scarce freshwater resources. Research and experiments have shown that brackish water can replace freshwater resources for agricultural irrigation, especially when irrigation is carried out during the period when crops are non-sensitive to brackish water, stable and high yields can be achieved.

[0003] In the transition process of using brackish water to replace freshwater resources for agricultural irrigation, there are still some practical problems: 1. Many crops have different tolerance ranges for brackish water at different growth stages. If brackish water with the same salt-water ratio is used for irrigation, it will cause difficulty for crops to absorb water during the brackish water sensitive period. For example, wheat is very sensitive to salt from the seedling to the tillering stage, so fresh water or brackish water with very low salt content should be used as much as possible; wheat begins to grow rapidly in the jointing stage, and the demand for water increases, but salt still needs to be controlled; wheat in the heading stage has a peak demand for water, and its tolerance to salt is relatively improved; and wheat in the grain filling to maturity stage has the strongest tolerance to salt, so a higher proportion of brackish water can be used; Therefore, how to obtain the optimal ratio of salt water for crops at different growth stages remains an important issue in the process of agricultural irrigation transformation by replacing freshwater resources with brackish water.

[0004] 2. When brackish water is used to irrigate crops such as wheat, even if the problem of different salt acceptance of crops at different growth stages mentioned in 1 is solved, new problems will arise. That is, the water in the soil environment irrigated with brackish water will evaporate and be absorbed by the crops in large quantities, but the crops absorb very little salt. Therefore, the main salt in the brackish water irrigation will be precipitated in large quantities in the surrounding soil environment, and as the irrigation continues, the precipitated salt continues to accumulate, resulting in the problem of excessive salt in the subsequent irrigation process even with strictly proportioned brackish water. At the least, the crops will have difficulty absorbing water and reduce production, and at worst, the crops will rot and fail to produce fruit.

[0005] Therefore, it is extremely difficult to completely realize the transition of using brackish water to replace fresh water resources for agricultural irrigation. At the current stage, the only way to alleviate the salt accumulation problem caused by brackish water irrigation is through the rational cross-use of brackish water and fresh water.

[0006] In view of the above problems, it is urgently necessary to make innovative designs based on the original wheat brackish water supplementary irrigation technology. Summary of the invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a brackish water supplementary irrigation technology for wheat to solve the problem that the existing brackish water irrigation method mentioned in the above background technology is difficult to accurately control the salt content in the surrounding environment.

[0008] To achieve the above object, the present invention provides the following technical solution: a brackish water supplementary irrigation technology for wheat, comprising a brackish water pipe and a fresh water drip irrigation pipe, a semipermeable membrane is arranged on the side of the brackish water pipe, and the semipermeable membrane is connected to the drip irrigation port of the fresh water drip irrigation pipe through a membrane pulling assembly; The membrane pulling assembly includes a pull rope, a spring and a plugging piece, one end of the semipermeable membrane is fixedly connected to the side wall of the brackish water pipe, and the other end of the semipermeable membrane is fixed with one end of the pull rope, and the other end of the pull rope is fixed with the plugging piece, the side wall of the brackish water pipe is provided with a slide groove that matches the plugging piece, and the inner wall of the slide groove is fixed with one end of the spring, and the other end of the spring is fixed to the outer wall of the plugging piece; The specific irrigation method includes the following steps: Step 1: Divide the saline water ratio into different intervals based on the tolerance of wheat to brackish water at different growth stages: S1-1, Seedling to tillering stage: Wheat is very sensitive to salt at this stage, so try to use fresh water or brackish water with very low salt content; Salt water ratio (ratio of brackish water to fresh water) recommendation: mineralization control ≤1.50g / L; S1-2, Jointing stage: Wheat begins to enter a rapid growth period, and the demand for water increases, but salt still needs to be controlled; Recommended salt water ratio: mineralization control ≤2.00g / L; S1-3, Heading stage: Wheat's demand for water reaches its peak, and its tolerance to salt increases relatively; Recommended salt water ratio: mineralization control ≤2.50g / L; S1-4, Grouting to maturity: At this stage, wheat is most tolerant of salt and can use a higher proportion of brackish water; Recommended saline water ratio: Mineralization should be controlled at ≤3.00g / L. Even in some cases (such as moderate to severe drought, low salinity in the soil environment), 100% brackish water can be used, but this depends on the specific conditions of the soil and crops.

[0009] Step 2: Irrigation stage: S2-1, Infiltration brackish water drip irrigation: Arrange brackish water pipes and fresh water drip irrigation pipes in the middle of the soil environment around several groups of wheat. During drip irrigation, the brackish water pipes seep water into the surrounding environment through the semi-permeable membrane, while the fresh water drip irrigation pipes remain in a normally closed state to save fresh water resources. S2-2. One-time conversion between brackish water drip irrigation and fresh water drip irrigation: S2-2-1. As the infiltration of brackish water continues, the partial evaporation of water and the absorption of wheat roots will cause the salinity in the surrounding environment to gradually accumulate and increase, forming a high-concentration and high-salinity liquid environment that exceeds the permeability range of the semipermeable membrane pores, causing the semipermeable membrane to temporarily lose its permeability; S2-2-2, when the semipermeable membrane permeation is stopped, the fluid resistance generated between the brackish water and the semipermeable membrane disappears, so that the water permeable bulge of the semipermeable membrane is alleviated and the fresh water drip irrigation pipe is opened by resetting the plugging piece, so as to realize the switching of the opening and closing state of the brackish water pipe and the fresh water drip irrigation pipe; S2-3. Secondary conversion of brackish water drip irrigation and fresh water drip irrigation: After the conversion between brackish water drip irrigation and fresh water drip irrigation in stages S2-2-1 and S2-2-2 in step 2, the surrounding high-concentration and high-salinity liquid environment is gradually desalinated by fresh water and the salinity in the surrounding liquid environment is continuously reduced. After it is reduced to within the permeability range of the semipermeable membrane permeability hole, the permeability of the semipermeable membrane is restored, and the brackish water inside the brackish water pipe seeps through the semipermeable membrane again and generates fluid resistance between the semipermeable membrane, causing the semipermeable membrane to restore the outward permeable bulge. Similarly, the fresh water drip irrigation pipe is closed by pulling the sealing piece in the opposite direction, and the brackish water drip irrigation and fresh water drip irrigation are converted again.

[0010] Preferably, in the four stages of wheat growth (seedling to tillering stage, jointing stage, heading stage and grain filling to maturity stage) in step 1, a more accurate salt-water ratio needs to be considered based on the following actual conditions: 1. Soil type and salt background: Different soil types have different buffering capacities for salt, and the salt-water ratio needs to be adjusted according to the salt content and type of the soil; 2. Climate conditions: High temperature, dryness and strong wind will intensify the evaporation of soil moisture and increase the accumulation of salt on the soil surface. The salt-water ratio should be appropriately reduced; 3. Crop Varieties: Different wheat varieties have different tolerance to salt. You should choose varieties with strong salt tolerance or adjust the salt-water ratio according to the characteristics of the variety. 4. Irrigation methods: Modern irrigation technologies such as drip irrigation and sprinkler irrigation can more effectively control water volume and salt distribution, and can use a higher proportion of brackish water than traditional irrigation methods.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention specifically regulates the salinity ratio of brackish water for irrigation based on the tolerance of wheat to different salinities in the four growth stages (seedling to tillering stage, jointing stage, heading stage and grain filling to maturity stage): 1. From seedling emergence to tillering stage: Wheat is very sensitive to salt at this stage, so try to use fresh water or brackish water with very low salt content; Salt water ratio (ratio of brackish water to fresh water) recommendation: mineralization control ≤1.50g / L; 2. Jointing stage: Wheat begins to enter a rapid growth period, and the demand for water increases, but salt still needs to be controlled; Recommended salt water ratio: mineralization control ≤2.0g / L; 3. Heading period: Wheat's demand for water reaches its peak, and its tolerance to salt increases relatively; Recommended salt water ratio: mineralization control ≤2.50g / L; 4. Grouting to maturity: At this stage, wheat is most tolerant of salt and can use a higher proportion of brackish water; Recommended saline water ratio: Mineralization should be controlled at ≤3.00g / L. Even in some cases (such as moderate to severe drought, low salinity in the soil environment), 100% brackish water can be used, but this depends on the specific conditions of the soil and crops. At the same time, based on the following aspects: 1. Soil type and salt background: Different soil types have different buffering capacities for salt, and the salt-water ratio needs to be adjusted according to the salt content and type of the soil; 2. Climate conditions: High temperature, dryness and strong wind will intensify the evaporation of soil moisture and increase the accumulation of salt on the soil surface. The salt-water ratio should be appropriately reduced; 3. Crop Varieties: Different wheat varieties have different tolerance to salt. You should choose varieties with strong salt tolerance or adjust the salt-water ratio according to the characteristics of the variety. 4. Irrigation methods: Modern irrigation technologies such as drip irrigation and sprinkler irrigation can more effectively control water volume and salt distribution, and can use a higher proportion of brackish water than traditional irrigation methods; The recommended saline-water ratios for the four stages of wheat growth are considered and adjusted to achieve the most suitable saline-water ratio for local soil type and salinity background, climatic conditions, crop varieties and irrigation methods.

[0012] 2. The present invention arranges a brackish water pipe and a fresh water drip irrigation pipe in the middle of the soil environment around several groups of wheat. During drip irrigation, the brackish water pipe infiltrates water into the surrounding environment through a semipermeable membrane, while the fresh water drip irrigation pipe remains in a normally closed state to save fresh water resources. As the brackish water infiltration continues, partial evaporation of water and absorption by the wheat root system will cause the salinity in the surrounding environment to gradually accumulate and increase, forming a high-concentration and high-salinity liquid environment and exceeding the permeability range of the semipermeable membrane permeation hole, so that the semipermeable membrane temporarily loses its permeability. When the semipermeable membrane permeation is stopped, the fluid resistance generated between the brackish water and the semipermeable membrane disappears, which makes the water permeable bulge of the semipermeable membrane alleviated and the fresh water drip irrigation pipe is opened by resetting the plugging piece, thereby realizing the first switching of the opening and closing states of the brackish water pipe and the fresh water drip irrigation pipe; After the first switching of the opening and closing states of the brackish water pipe and the fresh water drip irrigation pipe, the surrounding high-concentration and high-salinity liquid environment is gradually desalinated by fresh water and the salinity in the surrounding liquid environment is continuously reduced. After it is reduced to within the permeability range of the semipermeable membrane permeation hole, the permeability of the semipermeable membrane is restored, and the brackish water inside the brackish water pipe seeps out through the semipermeable membrane again and generates fluid resistance between the semipermeable membrane, causing the semipermeable membrane to restore the outward permeable bulge. Similarly, the fresh water drip irrigation pipe is closed by pulling the plugging piece in the opposite direction, and the brackish water drip irrigation and fresh water drip irrigation are switched again. This can reduce the adverse effects of salt analysis and accumulation and thus improve the effect 1 of precise control of the salinity of the surrounding environment during different growth stages of wheat. The main irrigation method is still brackish water irrigation, and the switch to fresh water is only to eliminate the problems caused by salt analysis and accumulation. At the same time, there will be no irrigation intervals to avoid water shortage of wheat. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic top view of the environment surrounding wheat irrigated with brackish water according to the present invention; Figure 2 This is a schematic diagram of the top view of the structure of the present invention when fresh water is used to adjust the environmental salinity; Figure 3 This is a schematic diagram of the present invention when brackish water is used to irrigate the surrounding environment of wheat; Figure 4 This is a schematic diagram of the principle of fresh water regulating environmental salinity in the present invention; Figure 5 For the present invention Figure 3 Schematic diagram of the switching structure between freshwater and brackish water; Figure 6 For the present invention Figure 4 Schematic diagram of the switching structure between freshwater and brackish water.

[0014] In the figure: 1. brackish water pipe; 2. fresh water drip irrigation pipe; 3. semipermeable membrane; 31. pull rope; 32. spring; 4. plugging piece. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0020] The embodiment of the present invention provides a high-efficiency cultivation technology for cotton with integrated water, fertilizer and salt in arid areas by drip irrigation, comprising a brackish water pipe 1 and a fresh water drip irrigation pipe 2, a semipermeable membrane 3 is arranged on the side of the brackish water pipe 1, and the semipermeable membrane 3 is connected to the drip irrigation port of the fresh water drip irrigation pipe 2 through a membrane pull assembly; The membrane pulling assembly includes a pull rope 31, a spring 32 and a blocking piece 4, one end of the semipermeable membrane 3 is fixedly connected to the side wall of the brackish water pipe 1, and the other end of the semipermeable membrane 3 is fixed with one end of the pull rope 31, and the other end of the pull rope 31 is fixed with the blocking piece 4, the side wall of the brackish water pipe 1 is provided with a slide groove that is plugged and matched with the blocking piece 4, and the inner wall of the slide groove is fixed with one end of the spring 32, and the other end of the spring 32 is fixed to the outer wall of the blocking piece 4; The specific irrigation method includes the following steps: Step 1: Divide the saline water ratio into different intervals based on the tolerance of wheat to brackish water at different growth stages: S1-1, Seedling to tillering stage: Wheat is very sensitive to salt at this stage, so try to use fresh water or brackish water with very low salt content; Salt water ratio (ratio of brackish water to fresh water) recommendation: mineralization control ≤1.50g / L; S1-2, Jointing stage: Wheat begins to enter a rapid growth period, and the demand for water increases, but salt still needs to be controlled; Recommended salt water ratio: mineralization control ≤2.00g / L; S1-3, Heading stage: Wheat's demand for water reaches its peak, and its tolerance to salt increases relatively; Recommended salt water ratio: mineralization control ≤2.50g / L; S1-4, Grouting to maturity: At this stage, wheat is most tolerant of salt and can use a higher proportion of brackish water; Recommended saline water ratio: Mineralization should be controlled at ≤3.00g / L. Even in some cases (such as moderate to severe drought, low salinity in the soil environment), 100% brackish water can be used, but this depends on the specific conditions of the soil and crops.

[0021] Step 2: Irrigation stage: S2-1, Infiltration brackish water drip irrigation: A brackish water pipe 1 and a fresh water drip irrigation pipe 2 are arranged in the middle of the soil environment around several groups of wheat. During drip irrigation, the brackish water pipe 1 infiltrates water into the surrounding environment through a semipermeable membrane 3, while the fresh water drip irrigation pipe 2 remains in a normally closed state to save fresh water resources. S2-2. One-time conversion between brackish water drip irrigation and fresh water drip irrigation: S2-2-1. As the infiltration of slightly salty water continues, the partial evaporation of water and the absorption of wheat roots will cause the salinity in the surrounding environment to gradually accumulate and increase, forming a high-concentration and high-salinity liquid environment and exceeding the permeability range of the semipermeable membrane 3 through the pores, causing the semipermeable membrane 3 to temporarily lose its permeability; S2-2-2, when the permeation of the semipermeable membrane 3 stops, the fluid resistance generated between the slightly salty water and the semipermeable membrane 3 disappears, such as Figure 3 and Figure 5As shown, when brackish water passes through the semipermeable membrane 3, the fluid resistance is used to push the semipermeable membrane 3 outward, and when the fluid resistance disappears, the spring 32 plays a reset role to drive the blocking piece 4 to slide deep into the chute in the brackish water pipe 1 and gradually open the fresh water drip irrigation pipe 2, thereby realizing the switching of the opening and closing states of the brackish water pipe 1 and the fresh water drip irrigation pipe 2; S2-3. Secondary conversion of brackish water drip irrigation and fresh water drip irrigation: After the conversion between brackish water drip irrigation and fresh water drip irrigation in stages S2-2-1 and S2-2-2 in step 2, the surrounding high-concentration and high-salinity liquid environment is gradually desalinated by fresh water and the salinity in the surrounding liquid environment is continuously reduced. After it is reduced to within the permeability range of the semipermeable membrane 3 through the holes, the permeability of the semipermeable membrane 3 is restored, and the brackish water inside the brackish water pipe 1 seeps through the semipermeable membrane 3 again and generates fluid resistance between the semipermeable membrane 3, causing the semipermeable membrane 3 to restore the outward permeable bulge. Similarly, the fresh water drip irrigation pipe 2 is closed by pulling the blocking piece 4 in the opposite direction, and the brackish water drip irrigation and fresh water drip irrigation are converted again.

[0022] In the four stages of wheat growth in step 1 (seedling to tillering, jointing, heading, and filling to maturity), a more accurate salt-water ratio needs to be considered based on the following actual conditions: 1. Soil type and salt background: Different soil types have different buffering capacities for salt, and the salt-water ratio needs to be adjusted according to the salt content and type of the soil; 2. Climate conditions: High temperature, dryness and strong wind will intensify the evaporation of soil moisture and increase the accumulation of salt on the soil surface. The salt-water ratio should be appropriately reduced; 3. Crop Varieties: Different wheat varieties have different tolerance to salt. You should choose varieties with strong salt tolerance or adjust the salt-water ratio according to the characteristics of the variety. 4. Irrigation methods: Modern irrigation technologies such as drip irrigation and sprinkler irrigation can more effectively control water volume and salt distribution, and can use a higher proportion of brackish water than traditional irrigation methods.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brackish water supplementary irrigation technology for wheat, comprising a brackish water pipe (1) and a fresh water drip irrigation pipe (2), characterized in that: A semipermeable membrane (3) is provided on the side of the brackish water pipe (1), and the semipermeable membrane (3) is connected to the drip irrigation port of the fresh water drip irrigation pipe (2) via a membrane pulling assembly; The membrane pulling assembly comprises a pull rope (31), a spring (32) and a blocking piece (4); one end of the semipermeable membrane (3) is fixedly connected to the side wall of the brackish water pipe (1), and the other end of the semipermeable membrane (3) is fixed with one end of the pull rope (31), and the other end of the pull rope (31) is fixed with the blocking piece (4); the side wall of the brackish water pipe (1) is provided with a slide groove that is plugged and matched with the blocking piece (4), and the inner wall of the slide groove is fixed with one end of the spring (32), and the other end of the spring (32) is fixed to the outer wall of the blocking piece (4); Specific irrigation method The steps include: Step 1: Divide the saline water ratio into different intervals based on the tolerance of wheat to brackish water at different growth stages: S1-1, Seedling to tillering stage: Wheat is very sensitive to salt at this stage, so try to use fresh water or brackish water with very low salt content; Salt water ratio (ratio of brackish water to fresh water) recommendation: mineralization control ≤1.50g / L; S1-2, Jointing stage: Wheat begins to enter a rapid growth period, and the demand for water increases, but salt still needs to be controlled; Recommended salt water ratio: mineralization control ≤2.0g / L; S1-3, Heading stage: Wheat's demand for water reaches its peak, and its tolerance to salt increases relatively; Recommended salt water ratio: mineralization control ≤2.5g / L; S1-4, Grouting to maturity: At this stage, wheat is most tolerant of salt and can use a higher proportion of brackish water; Recommended saline water ratio: Mineralization should be controlled at ≤3.0g / L. Even in some cases (such as moderate to severe drought, low salinity in the soil environment), 100% brackish water can be used, but this depends on the specific conditions of the soil and crops.

2. Step 2, irrigation stage: S2-1, Osmotic brackish water drip irrigation: A brackish water pipe (1) and a fresh water drip irrigation pipe (2) are arranged at a central position in the soil environment surrounding a plurality of wheat groups. During drip irrigation, the brackish water pipe (1) infiltrates water into the surrounding environment through a semi-permeable membrane (3), while the fresh water drip irrigation pipe (2) remains in a normally closed state to save fresh water resources. S2-2. One-time conversion between brackish water drip irrigation and fresh water drip irrigation: S2-2-1. As the infiltration of slightly salty water continues, the partial evaporation of water and the absorption of wheat roots will cause the salinity of the surrounding environment to gradually accumulate and increase, forming a high-concentration and high-salinity liquid environment and exceeding the permeability range of the semipermeable membrane (3), causing the semipermeable membrane (3) to temporarily lose its permeability; S2-2-2, when the permeation of the semipermeable membrane (3) is stopped, the fluid resistance generated between the slightly salty water and the semipermeable membrane (3) disappears, so that the water permeable bulge phenomenon of the semipermeable membrane (3) is alleviated and the fresh water drip irrigation pipe (2) is opened by resetting the blocking piece (4), thereby realizing the switching of the opening and closing states of the slightly salty water pipe (1) and the fresh water drip irrigation pipe (2); S2-3. Secondary conversion of brackish water drip irrigation and fresh water drip irrigation: After the conversion of brackish water drip irrigation to fresh water drip irrigation in stages S2-2-1 and S2-2-2 in step 2, the surrounding high-concentration and high-salinity liquid environment is gradually desalinated by fresh water and the salinity in the surrounding liquid environment is continuously reduced. After it is reduced to within the permeability range of the semipermeable membrane (3), the permeability of the semipermeable membrane (3) is restored, and the brackish water inside the brackish water pipe (1) seeps out through the semipermeable membrane (3) again and generates fluid resistance between the semipermeable membrane (3) and the semipermeable membrane (3) to restore the outward permeable bulge phenomenon. Similarly, the fresh water drip irrigation pipe (2) is closed by pulling the plugging piece (4) in the opposite direction, and the brackish water drip irrigation and fresh water drip irrigation are converted again.

3. The high-efficiency cultivation technology of cotton with integrated water, fertilizer and salt under drip irrigation in arid areas according to claim 1, characterized in that; In the four stages of wheat growth in step 1 (seedling to tillering stage, jointing stage, heading stage and grain filling to maturity stage), a more accurate salt-water ratio needs to be considered based on the following actual conditions:

1. Soil type and salt background: Different soil types have different buffering capacities for salt, and the salt-water ratio needs to be adjusted according to the salt content and type of the soil; 2. Climate conditions: High temperature, dryness and strong wind will intensify the evaporation of soil moisture and increase the accumulation of salt on the soil surface. The salt-water ratio should be appropriately reduced; 3. Crop Varieties: Different wheat varieties have different tolerance to salt. You should choose varieties with strong salt tolerance or adjust the salt-water ratio according to the characteristics of the variety.

4. Irrigation methods: Modern irrigation technologies such as drip irrigation and sprinkler irrigation can more effectively control water volume and salt distribution, and can use a higher proportion of brackish water than traditional irrigation methods.

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