A saline-alkali soil conditioner and application thereof

Abstract

The application provides a saline-alkali soil improver and application thereof, and belongs to the technical field of soil improvers.The saline-alkali soil improver comprises the following components in parts by weight: humic acid 10-20 parts, microbial inoculum 8-12 parts, earthworm enzyme nitrogen 20-40 parts, algal oligosaccharide 5-10 parts, alkyl polyglycoside biosurfactant 1-4 parts, and nano silicon dioxide 1-4 parts; the content of earthworm enzyme in the earthworm enzyme nitrogen is 0.5-1.5 g / kg.The saline-alkali soil improver can adapt to the planting technology of 'dry sowing and wet emergence', can effectively solve the problems of soil compaction, poor air permeability of planting holes and difficult seed germination caused by trace water in the dry sowing and wet emergence mode, can significantly improve the cotton seed germination rate and emergence uniformity, and can improve the seedling growth environment from the root.

Description

Technical Field

[0001] This invention belongs to the field of soil conditioner technology, and particularly relates to a soil conditioner for saline-alkali land and its application. Background Technology

[0002] Xinjiang Uygur Autonomous Region is a typical inland arid area, characterized by drought, low rainfall, and high evaporation rates. This, coupled with the rise of shallow groundwater, leads to significant soil salinization and secondary salinization problems, making it a core distribution area of ​​saline-alkali land. This severely restricts the sustainable development of oasis cotton irrigation agriculture. Meanwhile, agricultural water use efficiency in Xinjiang Uygur Autonomous Region is low. To meet the needs of water-saving production, high-efficiency water-saving irrigation technologies have been widely promoted throughout the region. Cotton fields commonly adopt the dry-sowing, wet-emergence, drip irrigation under mulch film model. This model eliminates the need for large-scale winter and spring irrigation to suppress salt, requiring only post-sowing irrigation for seedling emergence. It has significant advantages in water conservation, temperature increase, seedling promotion, and yield increase, and has become the core planting model for cotton fields in the region.

[0003] However, due to the influence of high salinity, clayey soils, and strong evaporation climates, the dry-seeding and wet-emergence technology has significant limitations: irrigation with small amounts of water after emergence can easily lead to soil compaction and reduced aeration in the seed hole, inhibiting cotton seed germination; simultaneously, frequent problems such as salt return through the membrane pores and salt crust accumulation on the surface affect cotton emergence and seedling survival, resulting in unstable yields. Currently, the industry lacks specialized soil conditioners and supporting technologies suitable for the dry-seeding and wet-emergence model. Existing soil conditioner products are mostly adapted to the traditional winter and spring irrigation model with large amounts of water to suppress salt, and cannot meet the needs of coordinated regulation of salt, water, air, and heat in the micro-area of ​​the seed hole under water-saving drip irrigation.

[0004] Existing commercially available saline-alkali soil conditioners are mostly single-function formulations, capable of simply reducing salinity or adjusting alkali. Their limited functionality, poor targeting, and limited improvement effects make them unable to simultaneously address the complex soil problems encountered under the dry-sowing, wet-laying model, such as soil salinization, compaction, low nutrient activation rates, and harsh rhizosphere microenvironment. Consequently, they are insufficient to effectively improve the quality of the planting hole soil and ensure stable cotton yields. Therefore, developing a composite soil conditioner suitable for the dry-sowing, wet-laying model that integrates salinity reduction and alkali adjustment, soil loosening and anti-compacting, growth promotion and seedling protection, and nutrient activation is of great significance for improving the productivity of saline-alkali farmland and ensuring the sustainable development of the cotton industry. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a soil conditioner for saline-alkali land and its application. The soil conditioner is adapted to the "dry sowing and wet emergence" planting technology and can effectively solve the problems of soil compaction, poor aeration of seed holes, and difficulty in seed germination caused by micro-drip water under the dry sowing and wet emergence mode. It can significantly improve the germination rate and uniformity of cotton seeds and improve the seedling growth environment from the root.

[0006] This invention provides a soil conditioner for saline-alkali land, comprising the following components in parts by weight: The mixture contains 10-20 parts humic acid, 8-12 parts microbial inoculant, 20-40 parts earthworm enzyme nitrogen, 5-10 parts seaweed oligosaccharide, 1-4 parts alkyl glycoside biosurfactant, and 1-4 parts nano silica; the earthworm enzyme content in the earthworm enzyme nitrogen is 0.5-1.5 g / kg.

[0007] Preferably, the components include the following parts by weight: Humic acid 12-18 parts, microbial agent 9-10 parts, earthworm enzyme nitrogen 25-35 parts, seaweed oligosaccharide 6-8 parts, alkyl glycoside biosurfactant 2-3 parts, nano silica 2-3 parts; Preferably, the microbial agent is a salt-tolerant microbial agent with an effective viable count ≥ 1 billion / g.

[0008] This invention provides the application of the aforementioned saline-alkali soil conditioner in cotton field soil improvement or in promoting cotton growth.

[0009] Preferably, the saline-alkali soil conditioner is suitable for the "dry sowing and wet emergence" cotton planting method.

[0010] Preferably, the soil conditioner for saline-alkali land is applied to the soil along with the water droplets used for seedling emergence.

[0011] Preferably, the application rate of the saline-alkali soil conditioner is 300-400 kg / hm². 2 .

[0012] Preferably, the irrigation volume of the seedling emergence water is 400-800 m³. 3 / hm 2 .

[0013] Compared with existing technologies, the present invention has the following beneficial effects: The present invention provides a soil conditioner for saline-alkali land, comprising the following components in parts by weight: 10-20 parts humic acid, 8-12 parts microbial inoculant, 20-40 parts earthworm enzyme nitrogen, 5-10 parts seaweed oligosaccharide, 1-4 parts alkyl glycoside biosurfactant, and 1-4 parts nano-silica. All components of the soil conditioner in the present invention are made from fully water-soluble raw materials. Combined with alkyl glycoside biosurfactant to optimize dispersion performance, it can achieve uniform drip application with seedling water, without flocculation, pipe blockage, or stratification. It is suitable for micro-volume, short-term dry-sowing, wet-emergence drip irrigation processes, aligning with the efficient water-saving planting mode for cotton.

[0014] In this invention, nano-silica, humic acid, and earthworm enzyme nitrogen work synergistically to rapidly unclog soil micropores and prevent the formation of cemented structures. The earthworm enzyme nitrogen provides earthworm enzymes and organic matter, effectively promoting the formation of soil aggregates, loosening the soil, breaking up compaction, and improving soil aeration, water retention, and fertilizer retention. Furthermore, it stimulates soil microbial activity, promoting the formation of large-particle aggregates and improving soil porosity and permeability. Nano-silica, humic acid, and earthworm enzyme nitrogen effectively solve the problems of soil compaction, poor seed hole aeration, and seed germination difficulties caused by micro-drip irrigation in dry-seeding and wet-harvesting methods.

[0015] The seaweed oligosaccharide described in this invention is a biologically induced resistance component. On the basis of improving soil salinity and alkalinity, it actively induces cotton seedlings to develop salt stress resistance, alleviating salt toxicity to the embryo and seedlings. It also synergistically regulates the rhizosphere microecology with microbial agents, forming a two-way regulatory mechanism of soil improvement and plant stress resistance, which greatly improves the seedling survival rate in saline-alkali cotton fields and reduces the risk of premature seedling senescence and seedling death.

[0016] This invention utilizes alkyl glycoside biosurfactants to achieve uniform longitudinal and lateral diffusion of various components, constructing a layered modified structure that enables rapid shallow salt dilution and deep salt stabilization. Combined with the dual effects of microbial agents secreting extracellular polysaccharides to passivate sodium ions and seaweed oligosaccharides adsorbing and stabilizing salt, it can effectively resist the problems of membrane pore salt return and surface salt crust enrichment caused by the strong evaporation climate of Xinjiang Uygur Autonomous Region. Detailed Implementation

[0017] This invention provides a soil conditioner for saline-alkali land, comprising the following components in parts by weight: 10-20 parts humic acid, 8-12 parts microbial inoculant, 20-40 parts earthworm enzyme nitrogen, 5-10 parts seaweed oligosaccharide, 1-4 parts alkyl glycoside biosurfactant, and 1-4 parts nano silica; wherein the earthworm enzyme nitrogen contains 0.5-1.5 g / kg of earthworm enzyme.

[0018] In this invention, the saline-alkali soil conditioner includes 10-20 parts of humic acid, preferably 12-18 parts, and more preferably 15 parts; in this invention, the humic acid preferably contains 10% potassium humate, has humic acid ≥60g / L, N+P2O5+K2O ≥200g / L, is a dark brown liquid, and is purchased from Xingnong Pharmaceutical (China) Co., Ltd.

[0019] In this invention, the saline-alkali soil conditioner comprises 8-12 parts of microbial inoculant, preferably 9-11 parts, and more preferably 10 parts; in this invention, the microbial inoculant is preferably a salt-tolerant microbial inoculant, and more preferably the commercially available Herman Star-Microbial Inoculant, purchased from Shandong Sipuwo Bioengineering Co., Ltd. The microbial inoculant is refined from highly active, high-content salt-tolerant compound bacteria as the core, combined with a variety of natural active substances. Through modern microbial fermentation technology and natural ingredient compounding process, five core substances—≥1 billion / g salt-tolerant compound bacteria, active polypeptide immune protease, mineral-derived potassium humate, seaweed polypeptides, and extracellular polysaccharides—are scientifically integrated.

[0020] In this invention, the saline-alkali soil conditioner comprises 20-40 parts of earthworm enzyme nitrogen, preferably 25-35 parts, and more preferably 30 parts. In this invention, the main components of the earthworm enzyme nitrogen are total nitrogen ≥30%, sulfur ≥14%, and earthworm enzyme 1000g / ton. In this invention, the earthworm enzyme nitrogen provides earthworm enzyme and organic matter, effectively promoting the formation of soil aggregates, loosening the soil, breaking up compaction, and improving soil aeration and water and fertilizer retention capacity. Furthermore, it stimulates the activity of microorganisms in the soil, promoting the formation of large-diameter aggregates and improving soil porosity and permeability. Simultaneously, it provides sufficient nitrogen for cotton, thereby promoting the absorption and utilization of other nutrients by the cotton.

[0021] In this invention, the saline-alkali soil conditioner further includes 5-10 parts of seaweed oligosaccharide, preferably 6-8 parts, and more preferably 7 parts. In this invention, the seaweed oligosaccharide is preferably a brown algae oligosaccharide with a degree of polymerization of less than 20, possessing characteristics of complete water solubility, low viscosity, high permeability, and strong adsorption. It can be completely dissolved in water and rapidly and evenly diffused into the 0-30cm longitudinal and transverse soil layers of the seed hole with the seedling irrigation water, without surface enrichment or sedimentation stratification. Its molecular chain is rich in a large number of carboxyl and hydroxyl active groups, exhibiting extremely strong chelation and adsorption capacity for free sodium ions, calcium and magnesium salt ions in the soil. The seaweed oligosaccharide in this invention, as a natural biological inducer, can activate the salt stress response pathway in cotton seedlings, enhance the activity of antioxidant enzymes in plants, reduce the toxic damage of salt ions to the cell membranes of embryos and seedlings, and significantly improve the salt tolerance and stress resistance of seedlings. Furthermore, the seaweed oligosaccharide and microbial agents synergistically regulate the rhizosphere microecology, promote seed germination, induce early root differentiation, alleviate the problems of delayed emergence, weak seedlings and seedling death caused by salt stress in saline-alkali land, and achieve bidirectional synergistic regulation of soil improvement and salt reduction and stress resistance and seedling protection.

[0022] In this invention, the saline-alkali soil conditioner includes 1 to 4 parts of alkyl glycoside biosurfactant, preferably 2 to 3 parts; in this invention, the alkyl glycoside biosurfactant is a green water-soluble penetrant that can significantly improve the uniformity of diffusion of all active components in the soil in the horizontal and vertical directions, breaking the existing predicament that active ingredients are only enriched in the surface layer, improving the distribution of active ingredients in the deep soil, and thus improving the improvement effect.

[0023] In this invention, the saline-alkali soil conditioner comprises 1-4 parts, preferably 2-3 parts, of nano-silica. The nano-silica exhibits excellent water dispersibility, allowing it to uniformly fill soil micropores when applied with water droplets, disrupting compacted structures and maintaining aeration and water transport channels in the planting hole for an extended period. In this invention, the synergistic effect of nano-silica, humic acid, and earthworm enzyme nitrogen rapidly unclogs soil micropores and prevents the formation of cemented structures.

[0024] This invention also provides the application of the aforementioned saline-alkali soil conditioner in cotton field soil improvement or cotton growth promotion. In this invention, the saline-alkali soil conditioner is adapted to the "dry sowing, wet emergence" cotton planting method, and is particularly suitable for cotton fields in southern Xinjiang Uygur Autonomous Region.

[0025] In this invention, the saline-alkali soil conditioner is applied to the soil with the seedling irrigation water. The preferred application rate of the saline-alkali soil conditioner is 300-400 kg / hm². 2 More preferably, 320~380 kg / hm 2 The optimal value is 350 kg / hm. 2 In this invention, the irrigation volume of the seedling emergence water is preferably 400-800 m³. 3 / hm 2 More preferably 500~700m 3 / hm 2 The optimal value is 600m 3 / hm 2 In this invention, the water used for seedling emergence is preferably applied in three stages.

[0026] This invention does not specifically limit the cotton planting method of "dry sowing and wet emergence" as described above; any cotton planting method of "dry sowing and wet emergence" known in the art can be used.

[0027] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0028] Raw materials used in the examples: The humic acid contains 10% potassium humate, with humic acid ≥60g / L and N+P2O5+K2O ≥200g / L. It is a dark brown liquid and was purchased from Xingnong Pharmaceutical (China) Co., Ltd.

[0029] The microbial agent was Herman Star-Microbial Agent, purchased from Shandong Sipuwo Bioengineering Co., Ltd., with a live bacteria count ≥1 billion / g.

[0030] The earthworm enzyme nitrogen "Songlifang Earthworm Enzyme Nitrogen" was purchased from Xinjiang Zhongnong Hongyuan Agricultural Technology Co., Ltd., with a soil remediation agent earthworm enzyme content of 1000g / ton.

[0031] The agricultural-grade brown algae oligosaccharide powder was purchased from Qingdao Bozhi Huili Biotechnology Co., Ltd.

[0032] The alkyl glycoside biosurfactant APG0814 was purchased from Yangzhou Chenhua New Materials Co., Ltd.

[0033] The nano-silica was purchased from Hebei Hongguo Agricultural Technology Co., Ltd., with an ultrafine particle size of 580nm and a SiO2 content of 30%. It is made by mixing 30% nano-silica sol with trace element chelates, SOD superoxidase balancers and other active biomass elements through multiple complex processes.

[0034] Example 1

[0035] Modifier A, the dosage of each component is as follows: 60 kg / hm of humic acid 2 40 kg / hm² of microbial inoculant 2 Earthworm enzyme nitrogen 120kg / hm 2 seaweed oligosaccharides 28kg / hm 2 Alkyl glycoside biosurfactant 12 kg / hm 2 Nano-silica 8kg / hm 2 .

[0036] Modifier B, the dosage of each component is as follows: 40 kg / hm of humic acid 2 48 kg / hm² of microbial inoculant 2 Earthworm nitrogen 80 kg / hm 2 seaweed oligosaccharides 20kg / hm 2 Alkyl glycoside biosurfactant 4 kg / hm 2 4 kg / hm² of nano-silica 2 .

[0037] Modifier C, the dosage of each component is as follows: 80 kg / hm of humic acid 2 48 kg / hm² of microbial inoculant 2 Earthworm enzyme nitrogen 160kg / hm 2 seaweed oligosaccharides 40kg / hm 2 Alkyl glycoside biosurfactant 16 kg / hm2 16 kg / hm² of nano-silica 2 .

[0038] Compared to improver D, the dosage of each component is as follows: 60 kg / hm of humic acid 2 40 kg / hm² of microbial inoculant 2 Earthworm enzyme nitrogen 120kg / hm 2 .

[0039] Compared to improver E, the dosage of each component is as follows: 60 kg / hm of humic acid 2 40 kg / hm² of microbial inoculant 2 Earthworm enzyme nitrogen 120kg / hm 2 seaweed oligosaccharides 28kg / hm 2 .

[0040] Compared to improver F, the dosage of each component is as follows: seaweed oligosaccharides 28kg / hm 2 Alkyl glycoside biosurfactant 12 kg / hm 2 Nano-silica 8kg / hm 2 .

[0041] Compared to improver G, the dosage of each component is as follows: 60 kg / hm of humic acid 2 40 kg / hm² of microbial inoculant 2 Earthworm enzyme nitrogen 120kg / hm 2 seaweed oligosaccharides 28kg / hm 2 Nano-silica 8kg / hm 2 .

[0042] Eight treatments were used, including amendments A through C, control amendments D through G, and a blank control (drip irrigation with clean water). Each treatment had three replicates.

[0043] The tested crop was cotton: China Cotton Research Institute 125

[0044] The base fertilizer is 18-20-8 compound fertilizer, applied before plowing, at a rate of 800 kg / hm². 2 .

[0045] Sowing was carried out on April 15th under dry-sowing and wet-emergence conditions. A single-film, three-pipe, six-row system was adopted (10 cm + 66 cm + 10 cm + 66 cm + 10 cm), meaning the widest row was 66 cm wide, the narrowest row was 10 cm wide, and the film spacing was 66 cm. A single film was used for mulching. The dripper flow rate was 2.1 L / h, the dripper spacing was 30 cm, and the drippers were placed 10 cm between the widest rows and the cotton rows. Eight treatments were set up with 24 plots, each plot being 50 m². 2 .

[0046] The soil conditioner was applied with the seedling water (the amount of conditioner added each time was calculated based on the proportion of the seedling water to the total seedling water volume). The seedling water was applied via drip irrigation on April 16th, with a flow rate of 150 m³ / h. 3 / hm 2 On April 23, drip irrigation was applied again, with a flow rate of 150m³. 3 / hm 2 Once the germination rate reaches over 80%, perform a third drip irrigation (for strengthening seedlings), with a drip irrigation volume of 300m³. 3 / hm 2 Other operations are the same as regular field management.

[0047] On May 20, 20 seedlings were selected from each plot for germination rate and plant height measurement. Fresh samples were weighed, dried, and then their dry weight was determined.

[0048] Table 1. Effects of different treatments on cotton emergence and growth

[0049] As can be seen, the blank control (CK), which was only irrigated with water, suffered from soil salinity stress and a poor rhizosphere microenvironment, resulting in a cotton emergence rate of only 61.67% and poor uniformity. The seedling emergence rates of the improvers A, B, and C in this invention reached 88.33%, 85.00%, and 86.67%, respectively, significantly higher than the water control, and the seedling emergence effect was significantly better than all the control treatments.

[0050] Comparative soil conditioner D, containing only basic soil-improving nutrients, had a seedling emergence rate of 81.67%, showing limited improvement. Comparative soil conditioner E, with the addition of seaweed oligosaccharides, saw its emergence rate increase to 83.33%, confirming that the plant-inducing resistance and salt-fixing functions of seaweed oligosaccharides can effectively alleviate seed salt stress. Comparative soil conditioner G, lacking an alkyl glycoside osmotic system, had a seedling emergence rate of 85.00%, lower than conditioner A, demonstrating that alkyl glycosides can improve the soil diffusion uniformity of active components and eliminate localized improvement blind spots. Comparative soil conditioner F, containing only seaweed oligosaccharides and functional adjuvants, had a seedling emergence rate of only 71.67%, showing extremely weak improvement. This indicates that single-structure improvement and stress-resistant components have limited effects; only by combining them with humic acid, earthworm enzyme nitrogen, and compound microbial agents can the emergence rate of cotton be guaranteed.

[0051] The cotton plant height reached 117.7 mm and stem diameter reached 3.87 mm under the treatment of improver A, which was the best among all treatments. Improvers C and B showed the next best growth, and the seedling vigor of all three was significantly better than that of the control treatments. In contrast, treatments D and E, which lacked both seaweed oligosaccharides and functional adjuvants, showed significantly limited increases in seedling height and stem diameter. Treatment G, which lacked alkyl glycoside penetration enhancers, showed weaker seedling growth than improver A due to uneven diffusion of active components and inconsistent rhizosphere improvement. Treatment F, which only contained adjuvants and seaweed oligosaccharides, lacked effective nutrient supply and soil improvement capabilities, and its seedling growth was very similar to the water control. Therefore, the basic nutrient system can provide nutritional support for seedling growth, seaweed oligosaccharides can improve the plant's salt tolerance and stress resistance, nano-silica optimizes soil structure and opens pores, and alkyl glycosides enhance component penetration and diffusion. This multi-dimensional synergy can solve the problems of slow seedling growth and weak stems in cotton seedlings in saline-alkali soils.

[0052] Soil samples were taken before and after the application of the soil conditioner to determine the soil salinity, pH value, and soil compaction, and the desalination rate was calculated. The results are shown in Table 2.

[0053] Soil salinity was determined using the conductivity method at a soil-to-water ratio of 1:5. The formula y = 2.778 was obtained by fitting the soil extract and the measured soil salinity. EC 1:5 Then, the electrical conductivity is converted into soil salinity.

[0054] In the formula: y is the soil salinity (g / kg), and EC1:5 is the electrical conductivity (mS / cm) measured under the condition of a soil-to-water mass ratio of 1:5.

[0055] Desalination rate (%) = (Soil salinity before application - Soil salinity after application) / Soil salinity before application × 100%.

[0056] Soil pH was determined using the potentiometric method (HJ 962-2018).

[0057] Soil compaction: The soil compaction was measured using a CP40Ⅱ soil compaction meter. For each treatment, 20 random locations were selected to measure the soil compaction at 5 cm, 10 cm, and 15 cm depths.

[0058] Table 2. Effects of different treatments on soil

[0059] Changes in soil salinity: The initial experimental site was severely saline soil (average salt content 13.54 g / kg). The blank control CK relied solely on irrigation water leaching, resulting in minimal salt reduction and maintaining a severe salinization level. The soil conditioners A, B, and C of this invention exhibited the best overall salt reduction effect, achieving a desalination rate of approximately 40%. In contrast, conditioner D (lacking seaweed oligosaccharides, alkyl glycoside biosurfactants, and nano-silica) showed a significantly weaker salt reduction effect. Conditioner F, lacking core components (only containing seaweed oligosaccharides, alkyl glycoside biosurfactants, and nano-silica), had the worst salt reduction capacity. Conditioner G, lacking alkyl glycoside permeation components and exhibiting uneven diffusion of active components, had a weaker salt reduction effect than conditioner A. This demonstrates that the synergistic effect of the multiple components in this invention is crucial for achieving efficient improvement of severely saline-alkali soil.

[0060] Soil pH changes: The original soil was highly alkaline, and all the soil amendments could lower the soil pH to varying degrees. Amendments A and C showed outstanding alkalinity-regulating effects; the pH of the blank control (CK) remained almost unchanged, indicating that the alkalinity-regulating ability of the single-functional component comparison samples was significantly insufficient.

[0061] Changes in soil compaction: After drip irrigation, the soil compaction of the control (CK) soil in clayey saline-alkali soil intensified, and the compaction of each soil layer increased. The soil conditioner of this invention, through the synergistic effect of hydrophilic mesoporous nano-silica and humic acid, can effectively break down the clay cement structure. The soil compaction of the 5 cm topsoil layer showed the most significant reduction, and the permeability of the deeper soil layers also improved simultaneously. In the control treatment lacking the permeability aid and permeability component, the ability to break down compaction decreased sequentially, consistent with the cotton emergence rate and growth data in Table 1.

[0062] In summary, soil conditioner A has the best comprehensive improvement effect on the three major obstacles of salt, alkali and compaction in severely saline soils, and corresponds to the best cotton seedling emergence rate and plant growth. It can be seen that the soil conditioner described in this invention is suitable for the severely saline-alkali cotton fields in Xinjiang Uygur Autonomous Region, and can be applied in a dry sowing and wet emergence, or drip irrigation mode.

[0063] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A soil conditioner for saline-alkali land, characterized in that, The components include the following parts by weight: The mixture contains 10-20 parts humic acid, 8-12 parts microbial inoculant, 20-40 parts earthworm enzyme nitrogen, 5-10 parts seaweed oligosaccharide, 1-4 parts alkyl glycoside biosurfactant, and 1-4 parts nano silica; the earthworm enzyme content in the earthworm enzyme nitrogen is 0.5-1.5 g / kg.

2. The soil conditioner for saline-alkali land according to claim 1, characterized in that, The components include the following parts by weight: Humic acid 12-18 parts, microbial agent 9-10 parts, earthworm enzyme nitrogen 25-35 parts, seaweed oligosaccharide 6-8 parts, alkyl glycoside biosurfactant 2-3 parts, nano silica 2-3 parts.

3. The soil conditioner for saline-alkali land according to claim 1, characterized in that, The microbial agent is a salt-tolerant microbial agent with an effective viable count ≥1 billion / g.

4. The application of the saline-alkali soil conditioner according to any one of claims 1 to 3 in soil improvement or cotton growth promotion in cotton fields.

5. The application according to claim 4, characterized in that, The soil conditioner for saline-alkali land is suitable for the "dry sowing and wet emergence" cotton planting method.

6. The application according to claim 5, characterized in that, The soil conditioner for saline-alkali land is applied to the soil along with the water droplets used for seedling emergence.

7. The application according to claim 6, characterized in that, The application rate of the saline-alkali soil conditioner is 300-400 kg / hm². 2 .

8. The application according to claim 6, characterized in that, The irrigation volume for seedling emergence is 400-800 m³. 3 / hm 2 .

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