Remediation agent suitable for Xinjiang secondary salinized soil

Abstract

The invention discloses a repairing agent suitable for Xinjiang secondary salinized soil, and belongs to the technical field of soil improvement. After bacillus velezensis, Frankia, ardealite, urea, potassium sulfate, calcium superphosphate, ferrous sulfate, furfural residues, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid are compounded for use, the salinization degree of soil is effectively relieved, and the soil fertility index is remarkably improved. Wherein the bacillus velezensis and the Frankia solid bacteria have a synergistic effect, so that the release and conversion of nutrient elements such as nitrogen, phosphorus and potassium in the soil can be promoted, the microbial community structure of the soil can be adjusted, and a powerful technical support is provided for repairing degraded soil such as secondary salinization; and new vitality is also injected for agricultural sustainable development.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement and relates to a repair agent suitable for secondary salinized soil in Xinjiang. Background Art

[0002] In the production practice of facility agriculture, small facilities have occupied a dominant position, which has limited the expansion of production scale to a certain extent. Since facility agriculture has been in a relatively closed working environment for a long time, farming activities are frequent and intensive, and the multiple cropping index remains high. In addition, the long-term and large-scale use of pesticides, chemical fertilizers and organic fertilizers has significantly affected the soil environment, resulting in frequent soil continuous cropping obstacles and serious imbalance of nutrient balance. These problems have further caused a series of environmental problems such as soil compaction and secondary salinization, which not only reduced the yield and quality of agricultural products, but also weakened the economic benefits. What is more serious is that the secondary salinization of facility soil is accompanied by the intensification of heavy metal pollution. These unfavorable factors not only threaten the safety of agricultural products, but also seriously hinder the sustainable development of facility agriculture.

[0003] Microbial agents, such as Bacillus and actinomycetes, have been widely used in the remediation of secondary salinized soils. However, when this technology is applied to secondary salinized soils in Xinjiang, it faces a series of challenges. For example, the sandy soil in Xinjiang is not only highly salinized, but also accompanied by extreme climatic conditions of drought. These environmental factors pose a severe test to the survival and effectiveness of microbial agents (especially Bacillus Velez).

[0004] Specifically, high salt and drought environments significantly affect the metabolic activity of Bacillus Velez, slowing its growth rate and even leading to the death of Bacillus Velez. The deterioration of this living environment directly weakens the stability of Bacillus Velez, which in turn seriously affects its effect in the soil remediation process, making it difficult to fully exert its ecological restoration potential. Therefore, how to overcome the adverse effects of the special environmental conditions in Xinjiang on the remediation effect of microbial agents has become a key issue that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a repair agent suitable for secondary salinized soil in Xinjiang, which is intended to solve the problems of the influence of Xinjiang's high salt and drought environment on the metabolic activity of microorganisms and the poor stability of microbial agents.

[0006] In a first aspect, the present invention provides a repair agent suitable for secondary salinized soil in Xinjiang, the repair agent comprising a soil conditioner and a microbial agent;

[0007] The microbial inoculants include solid inoculants of Bacillus Velezii and solid inoculants of Frankia;

[0008] The soil conditioner comprises phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid.

[0009] Furthermore, in the repair agent suitable for secondary salinized soil in Xinjiang provided by the present invention, the mass ratio of the solid bacterial agent of Bacillus Velezii and the solid bacterial agent of Frankia is 1:1.

[0010] Furthermore, the repair agent for secondary salinized soil in Xinjiang provided by the present invention is characterized in that the effective viable bacteria count in the solid bacterial agent of Bacillus Velez is 3.0×10 7 ~5.6×10 9 cfu / g;

[0011] The effective viable bacteria count in the solid inoculum of Frankia is 1.0×10 7 ~2.4×10 9 cfu / g.

[0012] Furthermore, in the repair agent suitable for secondary salinized soil in Xinjiang provided by the present invention, 0.56% to 1% of the microbial agent is additionally added to the soil conditioner in terms of mass percentage to obtain the repair agent.

[0013] Furthermore, the repair agent suitable for secondary salinized soil in Xinjiang provided by the present invention includes, by weight: 1 to 2 parts of Bacillus Velezii, 1 to 2 parts of Frankia, 20 to 50 parts of phosphogypsum, 5 to 15 parts of urea, 6 to 10 parts of potassium sulfate, 5 to 10 parts of superphosphate, 3 to 5 parts of ferrous sulfate, 20 to 54 parts of furfural residue, 50 to 100 parts of corn straw pellets, 20 to 72 parts of cottonseed meal, 57 to 134 parts of sheep manure pellets, 2 to 6 parts of EDTA-2Na and 10 to 40 parts of humic acid.

[0014] In a second aspect, the present invention provides the use of a repair agent suitable for secondary salinized soil in Xinjiang in improving secondary salinized soil.

[0015] Furthermore, the input amount of the repair agent of the present invention in the secondary salinized soil is 20 to 30 g / kg.

[0016] Furthermore, the method for using the repair agent of the present invention comprises: after tilling the soil and drying it for 3 to 5 days, applying the soil repair agent and keeping it moist for 10 to 20 days.

[0017] Furthermore, the input amount of the repair agent of the present invention is 70-100 kg / mu.

[0018] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects or advantages:

[0019] (1) After the optimal ratio soil remediation agent described in the present invention is used to improve the secondary salinized soil, the effect is significant compared with the unimproved soil: the alkaline nitrogen content surges by 62.5%, the effective phosphorus content increases by 51.5%, the effective potassium content also increases by 49.7%, and the organic matter content is greatly increased by 53.6%. In addition, the total salt content, electrical conductivity (EC value) and pH value (pH value) of the soil decreased by 47.0%, 51.3% and 21.4% respectively. The above data show that the soil remediation agent described in the present invention can not only effectively promote the significant increase of alkaline nitrogen, effective phosphorus, effective potassium and organic matter content in the soil, thereby greatly enhancing soil fertility, but also significantly reduce the total salt content, electrical conductivity and pH of the soil, effectively reduce the degree of soil salinization, and adjust the soil to a more suitable acid-base balance state.

[0020] (2) Compared with unimproved soil, the average yield increase rate of corn planted in the soil improved by the present invention is as high as 57.6%. The soil remediation agent of the present invention has obvious effects in improving the land environment, protecting the ecological health of farmland, and significantly increasing corn yield.

[0021] (3) The soil remediation agent of the present invention is effective in improving the land environment, protecting the ecological health of farmland, and significantly increasing corn yields. Compared with the soil remediation agent treatment group of the present invention, the average corn yield of the soil remediation agent treatment group without EDTA-2Na decreased by 5.6%. When EDTA-2Na, Bacillus Velezii and Frankia act synergistically in the soil, they can accelerate the decomposition and transformation process of harmful substances, promote the effective release of soil nutrients, and enhance the absorption and utilization efficiency of these nutrients by crop roots, thereby achieving a substantial increase in corn yields. DETAILED DESCRIPTION

[0022] The technical scheme of the present invention is described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments. The experimental methods and detection methods described in each embodiment are conventional methods unless otherwise specified; the reagents and materials described are all commercially available unless otherwise specified.

[0023] The phosphogypsum described in the embodiment of the present invention was purchased from Xinyangfeng Agricultural Science and Technology Co., Ltd., urea was purchased from Xinjiang Xinhua Fertilizer Co., Ltd., potassium sulfate and superphosphate were purchased from Xinjiang Century Zhongke Agriculture Co., Ltd., ferrous sulfate was purchased from Xinjiang Ruize Fengdeng Agricultural Technology Co., Ltd., furfural residue was purchased from Xinjiang Kangrunhe Ecological Agriculture Co., Ltd., corn straw pellets were purchased from Yili Xinshuo Biotechnology Co., Ltd., cottonseed meal was purchased from Aksu Jinhong Cotton Industry Co., Ltd., sheep manure pellets were purchased from Xinjiang Fengnuo Biotechnology Co., Ltd., EDTA-2Na was purchased from Urumqi Tou Tunhe District Soda Ash Chemical Products Distribution Department, humic acid was purchased from Xinjiang Shengda Yifang Biotechnology Co., Ltd., Bacillus Velez was purchased from Shandong Ruiyuan Biotechnology Co., Ltd., and Frankia was purchased from Wuhan Warner Biotechnology Co., Ltd.

[0024] Example 1

[0025] This embodiment provides a remediation agent for secondary salinized soil.

[0026] The soil remediation agent described in this embodiment includes a soil conditioner and a microbial agent, and 1.0% of the microbial agent is additionally added to the soil conditioner in terms of mass percentage. The soil conditioner includes: phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid; the microbial agent includes: Bacillus Velez solid agent and Frankia solid agent, and the mass ratio of Bacillus Velez solid agent to Frankia solid agent is 1:1.

[0027] In parts by weight, the soil remediation agent described in this embodiment includes 20 parts of phosphogypsum, 5 parts of urea, 6 parts of potassium sulfate, 5 parts of superphosphate, 3 parts of ferrous sulfate, 20 parts of furfural residue, 50 parts of corn straw pellets, 20 parts of cottonseed meal, 57 parts of sheep manure pellets, 2 parts of EDTA-2Na, 10 parts of humic acid, 1 part of Bacillus Velez solid inoculant, and 1 part of Frankia solid inoculant.

[0028] Example 2

[0029] This embodiment provides a remediation agent for secondary salinized soil.

[0030] The microbial agent described in this embodiment includes a soil conditioner and a microbial agent, and 0.56% of the microbial agent is additionally added to the soil conditioner in terms of mass percentage. The soil conditioner includes: phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid; the microbial agent includes: Bacillus Velez solid agent and Frankia solid agent, and the mass ratio of Bacillus Velez solid agent to Frankia solid agent is 1:1.

[0031] In parts by weight, the soil remediation agent described in this embodiment includes 35 parts of phosphogypsum, 10 parts of urea, 8 parts of potassium sulfate, 8 parts of superphosphate, 4 parts of ferrous sulfate, 38 parts of furfural residue, 75 parts of corn straw pellets, 46 parts of cottonseed meal, 100 parts of sheep manure pellets, 4 parts of EDTA-2Na, 30 parts of humic acid, 1 part of Bacillus Velez solid inoculant, and 1 part of Frankia solid inoculant.

[0032] Example 3

[0033] This embodiment provides a remediation agent for secondary salinized soil.

[0034] The microbial agent described in this embodiment includes a soil conditioner and a microbial agent, and 0.8% of the microbial agent is additionally added to the soil conditioner in terms of mass percentage. The soil conditioner includes: phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid; the microbial agent includes: Bacillus Velez solid agent and Frankia solid agent, and the mass ratio of Bacillus Velez solid agent to Frankia solid agent is 1:1.

[0035] In parts by weight, the soil remediation agent described in this embodiment includes 50 parts of phosphogypsum, 15 parts of urea, 10 parts of potassium sulfate, 10 parts of superphosphate, 5 parts of ferrous sulfate, 54 parts of furfural residue, 100 parts of corn straw pellets, 72 parts of cottonseed meal, 134 parts of sheep manure pellets, 12 parts of EDTA-2Na, 40 parts of humic acid, 2 parts of Bacillus Velez solid inoculant, and 2 parts of Frankia solid inoculant.

[0036] Example 4

[0037] This embodiment provides a method for preparing a secondary salinized soil remediation agent.

[0038] 1. Fermentation culture method of Bacillus Velez

[0039] The Bacillus Velez subtilis stored at 4°C was streaked on the LB solid medium, and the streaked LB solid medium was placed in a constant temperature incubator for activation culture at 30°C for 24 hours.

[0040] The fermentation medium of Bacillus Velez is composed of: 10.0g glucose, 15.0g yeast extract, 0.3g magnesium sulfate, 1.5g dipotassium hydrogen phosphate, 1.5g potassium dihydrogen phosphate, 0.5g light calcium carbonate, 0.03g manganese sulfate, 10.0g peptone, 10.0g beef extract, 1000mL distilled water, and pH is 7.0-7.5. Bacillus Velez is inoculated on the fermentation medium at an inoculum amount of 2%, and then shaken on a shaking table with a rotation speed of 160rpm / min for 96h, and the fermentation temperature is 26°C to obtain Bacillus Velez fermentation liquid.

[0041] 2. Fermentation culture of Frankia

[0042] The purchased Frankia was activated and cultured on BAP solid medium under the following conditions: constant temperature culture at 28°C in the dark for 72 hours. Frankia was inoculated into Qmod liquid medium at a 5% inoculum, and then shaken on a shaker at 200 rpm / min for 24 hours. The fermentation temperature was 28°C (cultured in dark conditions) to obtain Frankia fermentation liquid.

[0043] 3. Preparation of soil remediation agent

[0044] The fermentation broth of Bacillus Velezii and the fermentation broth of Frankia were spray dried respectively. The spray drying conditions were as follows: inlet temperature of 100-120°C, feed rate of 450-600 mL / h, air inlet speed of 20-25 M / h, spray pressure of 0.1-0.2 MPa, and the effective viable bacteria count of the solid inoculant of Bacillus Velezii was 3.0×10 7 ~5.6×10 9 cfu / g, the effective viable count of Frankia solid inoculant is 1.0×10 7 ~2.4×10 9 cfu / g.

[0045] Phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na, humic acid, Bacillus Velez solid inoculant and Frankia solid inoculant are compounded according to the formulas described in Examples 1 to 3 to obtain the secondary salinized soil remediation agent of the present invention.

[0046] For slightly saline-alkali land, the recommended application rate of soil remediation agent per mu is between 40 and 100 kg, and it should be applied once about half a month before sowing. During this period, it can be top-dressed 1 to 2 times as needed. The fertilization method can be selected from strip application, furrow application or hole application to ensure that the fertilizer can be evenly distributed and effectively play a role; for moderately saline-alkali land, the application rate of soil remediation agent per mu should be appropriately increased to 80 to 150 kg, and it should be applied once about half a month before sowing, and topdressed 1 to 2 times according to the growth of crops, or the number of topdressings can be adjusted according to actual needs. Strip application, furrow application or hole application can be selected according to actual conditions; for severely saline-alkali land, the application rate of soil remediation agent per mu needs to be further increased to 100 to 200 kg. After one application about half a month before sowing, it should be topdressed 2 to 3 times during this period to ensure that the crops can obtain sufficient nutrient support. The fertilization method can also be flexibly selected according to actual conditions.

[0047] Example 5

[0048] This example provides a potted experiment of using a soil remediation agent in secondary salinized soil.

[0049] The “S-shaped” sampling method was used to collect 140 topsoil samples (0-0.2 m) from the cotton-growing area of ​​Aral, Xinjiang. Each sample weighed 2 kg. The soil samples were dried at 25°C, sieved through a 2 mm sieve and stored for later use. The conditions of the test soil are shown in Table 2.

[0050] Table 2 Test soil conditions

[0051]

[0052] In this embodiment, 140 potted plants were set up, and the amount of fertilizer applied to each pot was 50g. The plants were divided into 7 treatment groups, each with 20 replicates. The design of each treatment group was as follows:

[0053] Treatment 1: untreated soil sample;

[0054] Treatment 2: soil conditioner (same as Example 3, without adding Bacillus Velez solid inoculant and Frankia solid inoculant);

[0055] Treatment 3: soil conditioner + Bacillus Velez solid inoculant (same as Example 3, without adding Frankia solid inoculant);

[0056] Treatment 4: soil conditioner + Frankia solid inoculant (same as Example 3, without adding Bacillus Velez solid inoculant);

[0057] Treatment 5: soil conditioner + microbial agent (same as Example 3, without adding EDTA-2Na);

[0058] Treatment 6: soil conditioner + microbial agent (same as Example 3);

[0059] Treatment 7: soil conditioner + microbial agent (same as Example 1);

[0060] Treatment 8: soil conditioner + microbial agent (same as Example 2);

[0061] Treatment 9: Bacillus Velez solid inoculum;

[0062] Treatment 10: Bacillus Velez solid inoculant + Frankia solid inoculant.

[0063] Thirty days after fertilization, the chemical properties of the soil were tested. The test results are shown in Table 3.

[0064] Table 3 Chemical properties of potting soil in different treatment groups

[0065]

[0066]

[0067] It can be found from Table 3 that in the arid and high-salt environment of Xinjiang, Bacillus Velez has poor adaptability. After being repaired by Bacillus Velez (treatment 9), only the effective potassium content and organic matter content increased slightly. Frankia has a slightly higher tolerance to the special environmental conditions in Xinjiang than Bacillus Velez. After being repaired by Frankia (treatment 10), the alkaline nitrogen content, effective phosphorus content, effective potassium content, and organic matter content all increased slightly.

[0068] Compared with the untreated soil sample (treatment 1), the alkaline nitrogen content, available phosphorus content, available potassium content, and organic matter content of the soil increased after the soil conditioner (treatment 2), soil conditioner and solid inoculant of Bacillus Velezii (treatment 3), soil conditioner and solid inoculant of Frankia (treatment 4), and soil conditioner and microbial composition (treatment 6), while the corresponding total salt content, EC value, and pH value all showed a downward trend. Compared with treatment 1, the alkaline nitrogen content of treatment 3 and treatment 4 increased by 18.9% and 25.7%, the available phosphorus content increased by 25.6% and 24.6%, the available potassium content increased by 16.8% and 18.5%, the organic matter content increased by 19.9% ​​and 26.6%, the total salt content decreased by 18.0% and 19.4%, and the EC value decreased by 13.2% and 17.85%, respectively. Compared with treatment 1, the alkaline nitrogen content of treatment 6 increased by 62.5%, the available phosphorus content increased by 51.5%, the available potassium content increased by 49.7%, and the organic matter content increased by 53.6%, while the total salt content, EC value and pH value decreased by 47.0%, 51.3% and 21.4%, respectively.

[0069] In addition, this embodiment also verifies the improvement effect of soil without adding EDTA-2Na (treatment 5). Compared with treatment 6, the alkaline nitrogen content, effective phosphorus content, effective potassium content and organic matter content of the improved soil in treatment 5 are slightly reduced. In the planting practice of facility agriculture, soil is not only faced with the challenge of secondary salinization, but is also often accompanied by a series of problems such as heavy metal pollution. EDTA-2Na, as an effective chemical chelating agent, can form a stable complex with heavy metal ions in the soil, thereby significantly reducing the toxicity of heavy metals to the soil, and creating a favorable chemical environment for soil remediation. EDTA-2Na removes salt and reduces the toxicity of heavy metal ions, while Bacillus Velez promotes plant growth and optimizes soil structure through its biological activity, and Frankia can fix nitrogen in the air, provide nitrogen nutrition for the soil and further optimize the soil environment. The three work synergistically to reduce the salinization degree of the soil and adjust the pH, promote the transformation and circulation of soil nutrients, thereby improving soil fertility.

[0070] Example 6

[0071] This example provides a field test of a bacterial agent for remediation of secondary salinized soil.

[0072] The location of this embodiment is Korla City and Shilike Township in Xinjiang, and the corn variety is Xinyu No. 9. Before planting corn, the experimental field is plowed and dried for 3 to 5 days, and then the soil remediation agent is applied. The experimental field is deep plowed and leveled to meet the requirements for corn sowing. After 10 to 20 days of moisture retention, corn is sown. Among them, 6 treatment groups are set up, each with 4 mu, and 80 kg of soil remediation bacteria are applied per mu. In the middle of corn growth, each treatment group is topdressed with urea once, and 30 kg of urea is applied per mu. The design of each treatment group is as follows:

[0073] Treatment 1: no soil remediation agent was added;

[0074] Treatment 2: soil conditioner (same as Example 3, without adding Bacillus Velez solid inoculant and Frankia solid inoculant);

[0075] Treatment 3: soil conditioner + Bacillus Velez solid inoculant (same as Example 3, without adding Frankia solid inoculant);

[0076] Treatment 4: soil conditioner + Frankia solid inoculant (same as Example 3, without adding Bacillus Velez solid inoculant);

[0077] Treatment 5: soil conditioner + microbial agent (same as Example 3, without adding EDTA-2Na);

[0078] Treatment 6: soil conditioner + microbial agent (same as Example 3).

[0079] Table 4 Yield of Xinyu 9 corn

[0080]

[0081] As shown in Table 4, the average corn yield in treatment 1 was 591.38 kg. However, after being treated with different remediation agents, the corn yield of each treatment group showed a significant growth trend. Specifically, the average corn yield of treatment 2 (using only soil conditioners) increased to 659.21 kg, an increase of 11.47%. The average corn yields of treatment 3 (combining soil conditioners with Bacillus Velez solid inoculant) and treatment 4 (combining soil conditioners with Frankia solid inoculant) were as high as 713.12 kg and 745.91 kg, respectively, compared with treatment 1, the increases were 23.1% and 26.1%, respectively.

[0082] Treatment 6 introduced Bacillus Velez and Frankia on the basis of soil conditioner. Compared with treatment 1, the corn yield of the four-acre test field in treatment 6 increased by 61.4%, 53.6%, 56.8% and 58.3% respectively, with an average yield increase rate of up to 57.6%. This embodiment also verifies the corn yield without adding EDTA-2Na (treatment 5). Compared with treatment 6, the average corn yield decreased by 5.6%. The soil remediation agent of the present invention is effective in improving the land environment, protecting the ecological health of farmland and significantly increasing corn yield. The synergistic effect of EDTA-2Na, Bacillus Velez and Frankia is fully reflected in treatment 6. EDTA-2Na, Bacillus Velez and Frankia act together in the soil, accelerate the decomposition and transformation of harmful substances in the soil, and promote the effective release of soil nutrients and the absorption and utilization of crop roots, providing a more favorable ecological environment for the growth of corn, thereby achieving a substantial increase in corn yield.

[0083] The soil remediation agent of the present invention effectively improves the land environment, protects the ecological health of farmland, and significantly increases corn yield by introducing microorganisms such as Bacillus Velezii and Frankia, and combining with soil conditioners. This achievement provides strong technical support for the remediation of degraded soils such as secondary salinization.

[0084] The embodiments described above are part of the embodiments of the present invention, but not all of them. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but only represents selected embodiments of the present invention. All other embodiments obtained without creative work and related deductions and substitutions made by ordinary technicians in the field under the conditions of the concept of the present invention belong to the scope of protection of the present invention.

Claims

1. A repair agent suitable for secondary salinized soil in Xinjiang, characterized in that: The repair agent includes soil conditioner and microbial agent; The microbial inoculants include solid inoculants of Bacillus Velezii and solid inoculants of Frankia; The soil conditioner comprises phosphogypsum, urea, potassium sulfate, superphosphate, ferrous sulfate, furfural residue, corn straw particles, cottonseed meal, sheep manure particles, EDTA-2Na and humic acid.

2. The repairing agent suitable for secondary salinized soil in Xinjiang according to claim 1, characterized in that: The mass ratio of the Bacillus Velez solid inoculant to the Frankia solid inoculant is 1:

1.

3. The repairing agent suitable for secondary salinized soil in Xinjiang according to claim 1, characterized in that: The effective viable bacteria count in the solid bacterial agent of Bacillus Velez is 3.0×10 7 ~5.6×10 9 cfu / g; The effective viable bacteria count in the solid Frankia agent is 1.0×10 7 ~2.4×10 9 cfu / g.

4. The repairing agent suitable for secondary salinized soil in Xinjiang according to claim 1, characterized in that: Calculated by mass percentage, 0.56% to 1% of the microbial agent is additionally added to the soil conditioner to obtain a repair agent.

5. The repairing agent suitable for secondary salinized soil in Xinjiang according to claim 1, characterized in that: The repair agent includes, by weight: 1 to 2 parts of Bacillus Velez, 1 to 2 parts of Frankia, 20 to 50 parts of phosphogypsum, 5 to 15 parts of urea, 6 to 10 parts of potassium sulfate, 5 to 10 parts of superphosphate, 3 to 5 parts of ferrous sulfate, 20 to 54 parts of furfural residue, 50 to 100 parts of corn straw pellets, 20 to 72 parts of cottonseed meal, 57 to 134 parts of sheep manure pellets, 2 to 6 parts of EDTA-2Na and 10 to 40 parts of humic acid.

6. Use of the repair agent suitable for secondary salinized soil in Xinjiang according to any one of claims 1 to 5 in improving secondary salinized soil.

7. The use according to claim 6, characterized in that: The input amount of the repair agent in the secondary salinized soil is 20-30 g / kg.

8. The use according to claim 6, characterized in that: include: After the soil is plowed and aired for 3 to 5 days, the soil remediation agent is applied to keep the soil moist for 10 to 20 days.

9. The use according to claim 6, characterized in that: The input amount of the repair agent is 70-100 kg / mu.

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