Method for synergistically improving saline-alkali soil through green manure, organic fertilizer and drainage system

Abstract

The invention relates to the field of saline-alkali soil improvement, and provides a method for synergistically improving saline-alkali soil through green manure, organic fertilizer and a drainage system, and the method comprises the following steps: S1, laying a concealed pipe drainage system in the saline-alkali soil; s2, applying a bio-organic fertilizer to the saline-alkali soil, then planting green manure crops, and finally performing crushing and turning and pressing treatment on the green manure crops; and S3, repeating the step S2 to complete improvement of the saline-alkali soil. Through the synergistic effect of the concealed pipe drainage system, the bio-organic fertilizer and green manure crops, a systematic saline-alkali soil improvement system is formed, and the excellent saline-alkali soil improvement effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of saline-alkali soil improvement, and in particular to a method for improving saline-alkali soil by using green manure, organic fertilizer and drainage system. BACKGROUND

[0002] Saline-alkali soil refers to a type of land where the content of salt and alkaline substances in the soil exceeds the tolerance threshold of crops, which hinders the growth of crops and reduces their yield, and thus seriously restricts agricultural production. The formation of saline-alkali soil is closely related to soil parent material, climate, groundwater level, and field water and fertilizer management. In arid regions, due to the large evaporation-to-precipitation ratio (the ratio of evaporation to precipitation), the amount of water evaporation is significantly greater than the amount of replenishment, and the salt in the soil rises and accumulates in the plough layer during the evaporation process, eventually causing soil salinization.

[0003] In the field of saline-alkali soil improvement, the commonly used method at present is to apply substances such as lime and gypsum, aiming to adjust the soil salinity and improve the soil environment. However, practice shows that the improvement effect of this method is poor, and it is difficult to achieve the ideal improvement goal. In order to solve this problem, researchers have tried to apply yellow acid and other improvers, hoping to improve the improvement effect of saline-alkali soil in this way. However, at present, the improvement effect is still limited, and in practical application, it still faces the dilemma of being unable to meet the demand for efficient governance. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defect of limited improvement effect in the prior art of saline-alkali soil improvement, and to provide a method for improving saline-alkali soil by using green manure, organic fertilizer and drainage system.

[0005] To this end, the present application provides the following technical solutions:

[0006] The present application provides a method for improving saline-alkali soil by using green manure, organic fertilizer and drainage system, comprising the following steps:

[0007] S1. Laying a pipe drainage system in the saline-alkali soil;

[0008] S2. Applying biological organic fertilizer to the saline-alkali soil, then planting green manure crops, and finally crushing and turning the green manure crops;

[0009] S3. Repeating S2 to complete the improvement of the saline-alkali soil.

[0010] In an optional embodiment, the pipe drainage system of S1 comprises drainage pipes, drainage ditch pipes and drainage branch pipes; the ends of the drainage pipes are connected to the drainage ditch pipes, and the ends of the drainage ditch pipes are connected to the drainage branch pipes.

[0011] The drainage pipes, drainage ditch pipes and drainage branch pipes are all buried below the ground surface.

[0012] In an alternative embodiment, the saline-alkali soil is leveled before laying the underground drainage system, which is achieved by using conventional techniques in the art.

[0013] In an alternative embodiment, the underground drainage system is laid by using an EG S3000 knife-chain trencher.

[0014] In an alternative embodiment, the drainage underground pipe, the drainage ditch pipe and the drainage branch pipe are all made of corrugated plastic pipes; the laying directions of the drainage underground pipe, the drainage ditch pipe and the drainage branch pipe are selected according to the actual situation of the saline-alkali soil to be treated.

[0015] In an alternative embodiment, the drainage underground pipe has a burial depth of 1.5-1.7 m, a spacing of 18-22 m, a single length of 150-250 m, a diameter of 80-100 mm, and a slope of 0.08%-0.12%.

[0016] The burial depth and spacing of the drainage underground pipe are set within the above ranges, which can improve the drainage efficiency, thereby effectively reducing the accumulated water, improving the soil ventilation condition, and further protecting the farmland ecological environment.

[0017] In an alternative embodiment, the low-side end of the drainage underground pipe is connected to the drainage ditch pipe, and the low-side end of the drainage ditch pipe is connected to the drainage branch pipe.

[0018] In an alternative embodiment, the drainage ditch pipe has a burial depth of 1.8-1.9 m, a diameter of 15-25 cm, a length of 450-550 m, and a slope of 0.015%-0.025%; the drainage branch pipe has a burial depth of 2-2.15 m, a diameter of 25-35 cm, a length of 550-650 m, and a slope of 0.02%-0.03%.

[0019] In an alternative embodiment, a water meter is installed at the end of the drainage branch pipe to monitor the relevant data during the drainage.

[0020] In an alternative embodiment, the end of the drainage branch pipe is connected to an ecological breeding area, which includes a fish pond or a duck farm.

[0021] The saline-alkali water drained by the underground drainage system is used to develop a characteristic saline-alkali water breeding, which not only can maintain the ecological balance and promote the coordinated development of the breeding industry and the natural environment, but also has a great significance for improving the ecological environment of the saline-alkali water area.

[0022] In an alternative embodiment, the biological organic fertilizer of S2 includes a main material, an auxiliary material and a strain; the main material includes animal manure; the auxiliary material includes one or more of straw, leaves and weeds; and the strain includes a fermentation strain.

[0023] In an optional implementation, the animal excrement comprises one or more of human excrement, cow excrement, sheep excrement, and donkey excrement; the straw comprises one or more of corn straw, wheat straw, and rice straw; the tree leaves comprise one or more of apple tree leaves, peach tree leaves, apricot tree leaves, and pear tree leaves; and the fermentation bacteria comprises Bacillus subtilis.

[0024] In an optional implementation, the weight ratio of the main material to the auxiliary material is (3-5):1, and the weight fraction of the bacteria in the bio-organic fertilizer is 0.3%-0.6%.

[0025] In an optional implementation, the method for preparing the bio-organic fertilizer in S2 comprises the following steps: mixing the main material, the auxiliary material, and the bacteria to obtain a mixture; adding water to the mixture to adjust the weight fraction of the water in the mixture to 55%-65%, and stacking the mixture to obtain a stack; and allowing the stack to stand to ferment, thereby obtaining the bio-organic fertilizer.

[0026] In an optional implementation, the ambient temperature for stacking is 15°C-70°C, air holes are arranged in the stack, the width of the stack is 1.8m-2.2m, the height of the stack is 0.5m-0.7m, and the volume of the stack is ≥10m 3 .

[0027] In an optional implementation, during the process of allowing the stack to stand to ferment, the temperature of the stack gradually increases, when the temperature of the stack increases to 45°C-55°C, the stack is turned over, the stack is turned over once a day, after the stack is turned over, if the temperature of the stack is ≥65°C, the frequency of turning over is increased to control the temperature, the temperature of the stack is maintained to be ≤70°C, and the fermentation is continuously performed until white mycelium appears in the material and no odor is generated, and then the fermentation is stopped.

[0028] In an optional implementation, the total fermentation time is 30 days-35 days.

[0029] The bio-organic fertilizer has the dual effects of a microbial fertilizer and an organic fertilizer. After the bio-organic fertilizer is applied to saline-alkali soil, the bio-organic fertilizer can provide rich nutrient elements and organic matter for crops, improve the soil structure, maintain the dynamic balance of soil nutrients, improve the biological activity and chemical properties of the soil, and enhance the water storage and fertilizer retention capacity of the soil, thereby significantly improving the stress resistance of crops and ensuring stable yield.

[0030] In an optional implementation, the application amount of the bio-organic fertilizer in S2 is 350kg / acre-550kg / acre.

[0031] In an optional implementation, S2 further comprises a step of performing rotary tillage treatment after the bio-organic fertilizer is applied to the saline-alkali soil; and the depth of the rotary tillage treatment is 25cm-35cm.

[0032] In an optional embodiment, the initial flowering stage refers to the initial stage of the flowering process of the green manure crop, specifically the period from the opening of the first flower to the opening of 5% of the flowers on the whole plant.

[0033] In an optional embodiment, the grain filling stage refers to the physiological process from the development of the ovary after fertilization (i.e., pod formation) to the full filling of the grain.

[0034] In an optional embodiment, the technical maturity stage refers to the critical stage at which the main product of the crop has completed growth and reached the peak yield, optimal quality, and lowest harvest loss.

[0035] In an optional embodiment, the green manure crop of S2 includes alfalfa, ryegrass, mung bean, or sugar beet. Alfalfa, ryegrass, mung bean, or sugar beet not only has strong environmental adaptability and is resistant to cold and drought, but also has robust root systems and outstanding salt tolerance, which can effectively improve the soil.

[0036] In an optional embodiment, the crushing period of the green manure crop includes the initial flowering stage of alfalfa, the initial flowering stage of ryegrass, the grain filling stage of mung bean, or the technical maturity stage of sugar beet. Each green manure crop is rich in nutrients and easy to decompose after crushing.

[0037] In an optional embodiment, the planting system of the green manure crop is strip seeding; the planting row spacing of the green manure crop is 10-25 cm; the seeding rate of the green manure crop is 10-20 kg / hm 2 2 .

[0038] Controlling the planting conditions of the green manure crop within the above range is beneficial to improving its emergence rate, plant organic matter content, and quality indicators.

[0039] After planting the green manure crop, a drip irrigation tape is laid, and surface drip irrigation is selected as the irrigation method, which has the following advantages: compared with flooding irrigation, drip irrigation can maintain the soil water content at a slightly higher suitable level. In terms of salt distribution control, drip irrigation can achieve stable fluctuations in salt content in the 0-40 cm soil layer. Although the surface salt content in the 0-5 cm layer is slightly higher than that in the flooding irrigation, the deep salt content in the 10-40 cm layer is significantly lower than that in the flooding irrigation, avoiding deep soil salt accumulation. At the same time, under the same irrigation and nitrogen application conditions, the nitrate nitrogen content of the drip irrigation treatment is higher, which is beneficial to the absorption and utilization of nitrogen by crops.

[0040] In an optional embodiment, S2 includes the step of laying a drip irrigation tape after planting the green manure crop; the pipe spacing of the drip irrigation tape is 55-65 cm, and the emitter spacing is 15-35 cm.

[0041] ​In an alternative embodiment, the drip irrigation belt is arranged as 1 pipe 4 rows-1 pipe 6 rows (one drip irrigation belt is responsible for irrigating 4 rows-6 rows of green manure crops).

[0042] The drip irrigation conditions are arranged in the above range, which is beneficial to improve the emergence rate, yield and growth effect of the green manure crops.

[0043] In an alternative embodiment, the depth of the turning and pressing treatment in S2 is 40cm-50cm.

[0044] In an alternative embodiment, S3 is performed after 3 weeks-4 weeks of the turning and pressing treatment in S2.

[0045] In an alternative embodiment, S2 and S3 are completed within one year, and the planting time is adjusted according to the suitable planting season of the green manure crops.

[0046] In an alternative embodiment, after the improvement of the saline-alkali land, the land is rested over winter, and the crops can be planted the next year.

[0047] The technical scheme of the present application has the following advantages:

[0048] 1. The present application provides a method for improving saline-alkali land by cooperating green manure, organic fertilizer and drainage system, comprising the following steps: S1. Laying a pipe drainage system in the saline-alkali land; S2. Applying biological organic fertilizer in the saline-alkali land, then planting green manure crops, and finally crushing and turning and pressing the green manure crops; S3. Repeating S2 to complete the improvement of the saline-alkali land.

[0049] The underground drainage system is adopted, the drainage pipelines of the underground drainage system are all arranged below the ground surface, saline-alkali water can be quickly drained, the underground water level can be effectively controlled, and the problems of soil salt return and secondary salinization caused by high underground water level can be fundamentally prevented. Compared with the traditional open ditch drainage, the system avoids the disadvantages of open ditch collapse, poor drainage, land occupation and the like, significantly improves the land utilization rate, facilitates the mechanized operation in the field, and has the advantages of fast drainage speed, remarkable desalination effect, long-term stable effect after one-time laying, and the like, and is suitable for the areas where the open ditch drainage is prone to collapse and siltation. The underground drainage system creates a stable environment for the growth of the green manure crops through continuous salt drainage; the biological organic fertilizer effectively improves the soil organic matter content, supplements necessary trace elements such as iron, manganese, copper and zinc, increases the number of soil aggregates through the cementation effect of organic matter, and lays a foundation for the emergence and growth of the green manure crops; the green manure crops are crushed and returned to the field after growing for a period of time, stimulate the soil positive excited state effect, the green manure is converted into nutrient elements that can be absorbed by crops through microbial decomposition, and the accumulation of soil organic matter and the improvement of soil fertility are further promoted. In addition, the green manure crops can absorb part of the salt in the soil during the growth process, and assist in reducing the degree of salinization. The underground drainage system, the biological organic fertilizer and the green manure crops are synergized to form a systematic saline-alkali soil improvement system, and an excellent saline-alkali soil improvement effect is achieved.

[0050] 2. The drainage underground pipe of the application has a buried depth of 1.5m-1.7m and a spacing of 18m-22m. The buried depth and spacing of the drainage underground pipe are arranged within the range of the application, which can improve the drainage efficiency, thereby effectively reducing the water accumulation, improving the soil ventilation condition, and further protecting the farmland ecological environment.

[0051] 3. The end of the drainage branch pipe is connected with the ecological breeding area, and the saline-alkali water drained by the underground drainage system is used to develop characteristic saline-alkali water breeding, which can not only maintain the ecological balance and promote the coordinated development of the breeding industry and the natural environment, but also has great significance for improving the ecological environment of the saline-alkali water area.

[0052] 4. The green manure crops include one or more of alfalfa, rye grass, mung bean and sugar beet, and the alfalfa, rye grass, mung bean and sugar beet not only have strong environmental adaptability and cold and drought resistance, but also have strong salt tolerance and robust root systems, and can effectively improve the soil.

[0053] 5. The planting conditions and drip irrigation conditions of the green manure crops are controlled within the range of the application, which is beneficial to improve the emergence rate, yield and growth effect of the green manure crops. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the accompanying drawings required to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0055] Figure 1 Layout for saline-alkali soil improvement in Example 1;

[0056] Figure 2 Layout for the structure of the underground drainage system in Example 1;

[0057] Figure 1 and Figure 2 In the above drawings, 1 is a saline-alkali soil; 2 is alfalfa; 3 is a drip irrigation belt; 4 is an underground drainage pipe; 5 is a water outlet of the drainage ditch pipe; 6 is a drainage ditch pipe; 7 is a drainage branch pipe; and 8 is an ecological breeding area. DETAILED DESCRIPTION

[0058] The following examples are provided to better further understand the present application and are not limited to the best mode, and do not limit the content and protection scope of the present application. Any person who obtains any product identical or similar to the present application under the inspiration of the present application or by combining the present application with other prior art features falls within the protection scope of the present application.

[0059] The specific experimental steps or conditions are not indicated in the examples, and can be performed according to the conventional experimental steps or conditions described in the literature in the art. The reagents or instruments used are not indicated by the manufacturer, and are conventional reagent products that can be obtained by purchase.

[0060] Example 1

[0061] The present embodiment provides a method for improving saline-alkali soil by cooperating green manure, organic fertilizer and drainage system, which comprises the following steps:

[0062] A saline-alkali soil to be treated (500 m long*200 m wide) is leveled, and then a subsurface pipe drainage system is laid on the saline-alkali soil by an EG S3000 knife chain ditching and pipe laying machine, the subsurface pipe drainage system comprising drainage subsurface pipes, drainage ditch pipes and drainage branch pipes (all made of corrugated plastic pipes), wherein the drainage subsurface pipes are arranged in the north-south direction, the drainage subsurface pipes have a buried depth of 1.5 m-1.7 m, a spacing of 20 m, a single pipe length of 200 m and a diameter of 90 mm, the drainage subsurface pipes are higher in the south and lower in the north, and have a slope of 0.1%, and the low-side ends of the drainage subsurface pipes are connected to the drainage ditch pipes. The drainage ditch pipes are arranged in the east-west direction, have a diameter of 20 cm, a length of 500 m and a buried depth of 1.8 m-1.9 m, the drainage ditch pipes are higher in the west and lower in the east, and have a slope of 0.02%, and the low-side ends of the drainage ditch pipes are connected to the drainage branch pipes. The drainage branch pipes are arranged in the north-south direction, have a length of 600 m and a diameter of 30 cm, the drainage branch pipes are higher in the south and lower in the north, and have a slope of 0.025%, a water meter is arranged at the end of each drainage branch pipe for monitoring relevant data during drainage, and an ecological breeding area (fish pond) is connected to the end of each drainage branch pipe.

[0063] The main material (cattle manure), the auxiliary material (crushed corn stalks) and the strain (Bacillus subtilis) are mixed to obtain a mixture, the weight ratio of the main material to the auxiliary material in the mixture is 4:1, and the weight fraction of the strain in the mixture is 0.45%; water is added to the mixture to adjust the weight fraction of water in the mixture to 60%, and the mixture is stacked under the condition that the ambient temperature is 20 DEG C to obtain a stack (the stack is 2 m wide and 0.6 m high, and a ventilation channel is arranged in the stack) with a volume of 12 m 3 ; the stack is left to ferment, during the fermentation, when the temperature of the stack rises to 50 DEG C, the stack is turned over once a day, after the turning over, if the temperature of the stack is greater than or equal to 65 DEG C, the turning over frequency is increased to regulate the temperature, the temperature of the stack is maintained to be less than or equal to 70 DEG C, the fermentation is continuously carried out until white mycelium appears in the material and there is no odor, the fermentation is stopped (the total time of the above fermentation is 32 days), and a bio-organic fertilizer is obtained.

[0064] The bio-organic fertilizer is applied to the saline-alkali soil (the dosage is 400 kg / mu), and rotary tillage treatment is performed after the application is completed, the depth is 30 cm; then alfalfa (variety is Gannong No. 5) is planted, the planting system is strip sowing, the row spacing is 20 cm, and the sowing amount is 16 kg / hm 2 ; after the planting is completed, drip irrigation belts are laid, one pipe is arranged for four rows, the pipe spacing is 60 cm, and the emitter spacing is 30 cm; when the alfalfa grows to the initial flowering stage (3% of the whole plant has flowers), the alfalfa is crushed and turned over (the depth of the turning over treatment is 45 cm).

[0065] After 3 weeks of the turning treatment, repeat the above steps from "applying the bio-organic fertilizer on the saline-alkali land" to "carrying out the crushing and turning treatment on the ryegrass when the ryegrass grows to the initial flowering stage" once to complete the improvement of the saline-alkali land, so that the land is rested over winter, and the crop can be planted the next year.

[0066] The planar layout of the improvement of the saline-alkali land in Example 1 is shown in Figure 1 The structural layout of the underground drainage system in Example 1 is shown in Figure 2 ; Figure 1 and Figure 2 , wherein 1 is the saline-alkali land; 2 is the ryegrass; 3 is the drip irrigation belt; 4 is the underground drainage pipe; 5 is the water outlet of the drainage ditch pipe; 6 is the drainage ditch pipe; 7 is the drainage branch pipe; and 8 is the ecological breeding area.

[0067] Example 2

[0068] The present example provides a method for improving the saline-alkali land by the cooperation of green manure, organic fertilizer and drainage system, comprising the following steps:

[0069] The saline-alkali land to be treated (500 m long and 200 m wide) is leveled, and then the underground drainage system is laid on the saline-alkali land by the same method and condition as in Example 1.

[0070] The bio-organic fertilizer is prepared by the same method and condition as in Example 1.

[0071] The bio-organic fertilizer is applied on the saline-alkali land (the amount is 500 kg per mu), and after the application is completed, the rotary tillage treatment is carried out with a depth of 30 cm; then the ryegrass is planted, the planting system is strip sowing, the row spacing is 10 cm, and the sowing amount is 10 kg / hm 2 The drip irrigation belt is laid after the planting is completed, the drip irrigation belt has 6 rows of pipes with a pipe spacing of 60 cm and a dripper spacing of 15 cm, and the crushing and turning treatment is carried out on the ryegrass when the ryegrass grows to the initial flowering stage (3% of the whole plant flowers open) (the depth of the crushing and turning treatment is 45 cm).

[0072] After 3 weeks of the turning treatment, repeat the above steps from "applying the bio-organic fertilizer on the saline-alkali land" to "carrying out the crushing and turning treatment on the ryegrass when the ryegrass grows to the initial flowering stage" once to complete the improvement of the saline-alkali land, so that the land is rested over winter, and the crop can be planted the next year.

[0073] Example 3

[0074] The present example provides a method for improving the saline-alkali land by the cooperation of green manure, organic fertilizer and drainage system, comprising the following steps:

[0075] The saline-alkali land to be treated (500 m long * 200 m wide) was leveled, and then a subsurface pipe drainage system was laid in the saline-alkali land using the same method and conditions as in Example 1.

[0076] The bio-organic fertilizer was prepared using the same method and conditions as in Example 1.

[0077] The bio-organic fertilizer was applied to the saline-alkali land (at a dosage of 500 kg / mu), and after the application was completed, rotary tillage treatment was performed to a depth of 30 cm; then mung beans were planted, and the planting system was strip sowing, the row spacing was 10 cm, and the seeding amount was 20 kg / hm 2 After planting, drip irrigation tape was laid, the drip irrigation tape 1 pipe 6 rows, the pipe spacing was 60 cm, the dripper spacing was 20 cm, and when the mung beans grew to the filling stage, the mung beans were crushed and incorporated (the depth of the incorporation treatment was 45 cm).

[0078] After the incorporation treatment, the above steps from "applying bio-organic fertilizer to the saline-alkali land" to "crushing and incorporating the mung beans when the mung beans grow to the filling stage" were repeated once after an interval of 3 weeks, the saline-alkali land was improved, the land was rested over winter, and the next year crop planting could be started.

[0079] Comparative Example 1

[0080] This comparative example provides a method for improving saline-alkali land, which is basically the same as Example 2, except that the planting of ryegrass is omitted, and specifically includes the following steps:

[0081] The saline-alkali land to be treated (500 m long * 200 m wide) was leveled, and then a subsurface pipe drainage system was laid in the saline-alkali land using the same method and conditions as in Example 1.

[0082] The bio-organic fertilizer was prepared using the same method and conditions as in Example 1.

[0083] The bio-organic fertilizer was applied to the saline-alkali land (at a dosage of 500 kg / mu), and after the application was completed, rotary tillage treatment was performed to a depth of 30 cm; the improvement of the saline-alkali land was completed, and crop planting could be started.

[0084] Comparative Example 2

[0085] This comparative example provides a method for improving saline-alkali land, which is basically the same as Comparative Example 1, except that the bio-organic fertilizer is applied to the saline-alkali land (at a dosage of 500 kg / mu) while also including the application of fulvic acid (at a dosage of 6 kg / mu).

[0086] Comparative Example 3

[0087] The comparative example 1 provides a method for improving saline-alkali soil, which is basically the same as the method of the comparative example 1, except that the bio-organic fertilizer (500 kg / acre) is applied to the saline-alkali soil.

[0088] Comparative example 4

[0089] The comparative example 1 provides a method for improving saline-alkali soil, which is basically the same as the method of the comparative example 1, except that the bio-organic fertilizer (500 kg / acre) is applied to the saline-alkali soil.

[0090] The land after the improvement of the saline-alkali soil in the examples 1-3 and the comparative examples 1-3 is tested for physical and chemical properties, wherein the pH value is measured by using a pH meter (Shanghai Yilian Scientific Instrument Co., Ltd., PHS-2F); the soil bulk density is measured by using a cutting ring to collect soil samples, which are dried to constant weight in an oven at 105°C in the laboratory; the salt content is measured by using an electrical conductivity meter (Shanghai Yilian Scientific Instrument Co., Ltd., DDS-307) to measure the soil electrical conductivity (EC1:5) value, and the soil salt content (SSC) is calculated according to the conversion formula (SSC = 3.43EC + 1.05, R 2 = 0.95); the organic matter content is measured by using potassium dichromate volumetric method; the available phosphorus content is measured by using molybdenum-antimony anti-colorimetric method; and the available potassium content is measured by using flame photometer method. The test results are recorded in Table 1.

[0091] Table 1 Test results

[0092]

[0093] In Table 1, the control is the saline-alkali soil without any treatment. As can be seen from Table 1, compared with the comparative examples, the improvement effects of the examples 1-3 show significant advantages: the soil pH value after the improvement is shifted to neutral and does not show obvious alkaline characteristics; the soil bulk density and salt content are effectively reduced, and the nutrient indicators such as organic matter and available phosphorus are significantly improved, and the available potassium content is effectively controlled within a reasonable range (100 mg / kg-300 mg / kg, the lower the better), which comprehensively reflects the positive role of the improvement measures in improving the physical and chemical properties of the soil and improving the soil fertility.

[0094] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A method for improving saline-alkali land by synergistically using green manure, organic fertilizer and drainage system, characterized in that: The following steps are involved: S1. Lay a concealed drainage system in saline-alkali land; S2. Applying bio-organic fertilizer to saline-alkali land, then planting green manure crops, and finally crushing and compacting the green manure crops; S3. Repeat S2 once to complete the improvement of saline-alkali land.

2. The method for improving saline-alkali land by using green manure, organic fertilizer and drainage system in collaboration according to claim 1, characterized in that: The concealed drainage system in S1 includes concealed drainage pipes, drainage ditch pipes and drainage branches; The end of the concealed drainage pipe is connected to the drainage ditch pipe, and the end of the drainage ditch pipe is connected to the drainage branch pipe.

3. The method for improving saline-alkali land by using green manure, organic fertilizer and drainage system in collaboration according to claim 2, characterized in that: At least one of the following conditions is met: (1) The buried depth of the drainage pipe is 1.5m-1.7m, the spacing is 18m-22m, the length of a single pipe is 150m-250m, the diameter is 80mm-100mm, and the slope is 0.08%-0.12%; (2) The drainage ditch pipe has a buried depth of 1.8m-1.9m, a diameter of 15cm-25cm, a length of 450m-550m, and a slope of 0.015%-0.025%; (3) The drainage branch pipe has a buried depth of 2m-2.15m, a diameter of 25cm-35cm, a length of 550m-650m, and a slope of 0.02%-0.03%; (4) The end of the drainage branch pipe is connected to the ecological breeding area.

4. The method for improving saline-alkali land by coordinating green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: The application amount of the bio-organic fertilizer in S2 is 350kg / mu-550kg / mu.

5. The method for improving saline-alkali land by coordinating green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: S2 further includes the step of performing rotary tillage treatment after applying the bio-organic fertilizer on the saline-alkali land; Optionally, the depth of the rotary tillage treatment is 25cm-35cm.

6. The method for improving saline-alkali land by coordinating green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: S2 The green manure crops include one or more of alfalfa, ryegrass, mung bean, and sugar beet; Optionally, crush the alfalfa at the early flowering stage; Optionally, ryegrass can be crushed at the early flowering stage; Optionally, mung beans can be crushed during the grain filling stage; Optionally, the beets are crushed at the process maturity stage.

7. The method for improving saline-alkali land by coordinating green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: The planting of green manure crops in S2 meets at least one of the following conditions: (1) The planting system of the green manure crop is row sowing; (2) The planting row spacing of the green manure crops is 10 cm to 25 cm; (3) The sowing rate of the green manure crop is 10 kg / hm 2 -20kg / hm 2 .

8. The method for improving saline-alkali land by coordinating green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: After planting green manure crops, S2 includes the step of laying drip irrigation tape; Optionally, the tube spacing of the drip irrigation belt is 55cm-65cm, and the dripper spacing is 15cm-35cm.

9. The method for improving saline-alkali land by synergistically combining green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: The depth of the turning and pressing treatment in S2 is 40cm-50cm.

10. The method for improving saline-alkali land by synergistically combining green manure, organic fertilizer and drainage system according to any one of claims 1 to 3, characterized in that: After the turning and pressing treatment in S2, wait for 3 to 4 weeks before performing S3.

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