Multifunctional saline alkali soil conditioner and application thereof

Abstract

The invention relates to the technical field of land improvement, in particular to a multifunctional saline alkali soil conditioner and application thereof. The multifunctional saline-alkali soil conditioner comprises an inorganic nitrogen-phosphorus fertilizer, mixed acid, potassium humate, an organic material, organic silicon, a microbial inoculum, mineral powder and a synergist. The multifunctional saline-alkali soil conditioner prepared from the components can condition the physical structure of soil, reduce salt and remove alkali, promote formation of granular structures, promote robust growth of crops, enhance stress resistance and improve yield and quality. A basis is provided for harmless improvement of the saline-alkali soil.

Description

Technical Field

[0001] The invention relates to the technical field of land improvement, and in particular to a multifunctional saline-alkali soil conditioner and application thereof. Background Art

[0002] Soil salinization is a major obstacle to the functioning of agricultural soil ecosystems in arid and desert regions around the world. It not only seriously affects the physical and chemical properties of the soil, but also seriously restricts the stability of food production and the improvement of land use efficiency. At present, the existence of large areas of saline-alkali land and the aggravation of soil salinization have become important factors restricting the development of agricultural production. It is urgent to improve saline-alkali soil to ensure the sustainable development of agriculture.

[0003] The salt in saline-alkali farmland soil seriously harms the root system of crops. After the root system of crops is poisoned by salt, the root system is poorly developed and prematurely aged. There is a lot of salt in saline-alkali soil, and the salt rises to form salt frost on the soil surface. The ventilation and water permeability are poor, and the root system of crops is often poisoned, rotten, and dead. Even if a large amount of fertilizer is invested, it is difficult for crops to absorb and utilize it, resulting in the negative effect of high input and low output. Currently, commonly used chemical conditioning materials are divided into four categories: calcium-based (desulfurized gypsum, phosphogypsum, etc.), acidic salts (potassium dihydrogen phosphate, sodium dihydrogen phosphate, etc.), strong acid and weak base salts (ferrous sulfate, aluminum sulfate, etc.) and organic acids (humic acid, furfural residue, etc.). Calcium-based materials increase soil Ca 2+ content, replacing the Na adsorbed on soil colloids + and Mg 2+ , which changes the sodium hydrophilic colloid into calcium hydrophobic colloid, thereby improving soil permeability and playing a role in desalination and inhibiting salt return. At the same time, the sodium bicarbonate content is significantly reduced, improving the calcium nutritional conditions of saline-alkali soil. In addition, gypsum is a calcium fertilizer that can improve the drought resistance of plants, but the cost of using gypsum to manage saline-alkali land is too high, making it difficult to promote, and it cannot change the fertilizer effect of saline-alkali land; some saline-alkali lands contain a large amount of sodium bicarbonate, the pH is high, the solubility of calcium carbonate decreases, and it is easy to produce sedimentation, causing soil compaction, affecting the effect of replacement and soil improvement. Inorganic acid release, organic acid dissociation and Fe 2+ 、Al 3+ The H formed by hydrolysis + CO3 in soil solution 2- , HCO 3- Neutralization to remove OH from soil solution -, by reducing soil alkalinity (ESP) and pH to eliminate the alkalization hazard. However, some organic acids may form complexes with heavy metal ions in the soil, increase the migration capacity of heavy metals, and increase the risk of heavy metal pollution in soil and crops; acidic conditioning materials may affect the activity of microorganisms, change the structure of soil microbial communities, and thus affect the health and function of soil ecosystems; in addition, the cost of using organic acid conditioners is still high, especially when applied on large areas of land.

[0004] Due to the common characteristics of saline-alkali land, the soil has low organic matter content, poor physical and chemical properties, many anions and cations that are harmful to crop growth, low soil fertility, and is not easy to promote seedling growth. In recent years, the use of organic-inorganic composite conditioners to improve soil has become a hot topic in soil improvement research. However, existing organic-inorganic composite conditioners generally have the following problems: some components are physically incompatible, and stratification and precipitation occur during storage and transportation, affecting the effect and convenience of the conditioner; chemical reactions may occur between some components, affecting the stability and fertilizer efficiency of the conditioner; causing potential harm to the soil ecosystem and groundwater; and the effects on different soils may vary greatly.

[0005] Based on this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a multifunctional saline-alkali soil conditioner with stable ingredients, environmental friendliness, strong universality, and the ability to adjust soil physical structure, reduce salt and remove alkali, promote the formation of aggregate structure, promote the robust growth of crops, enhance stress resistance, and improve yield and quality; in particular, it relates to a multifunctional saline-alkali soil conditioner and its application.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a multifunctional saline-alkali soil conditioner, comprising the following components in parts by weight:

[0009] 10-20 parts of inorganic nitrogen and phosphorus fertilizers, 5-10 parts of mixed acid, 5-15 parts of potassium humate, 20-30 parts of organic materials, 5-10 parts of organosilicon, 5-10 parts of bacterial agent, 15-30 parts of mineral powder, and 5-15 parts of synergist.

[0010] Preferably, the inorganic nitrogen and phosphorus fertilizer has a nitrogen content of ≥18wt% and a phosphorus content of ≥10wt%.

[0011] Preferably, the mixed acid comprises the following components in mass ratio:

[0012] The ratio of alginate: hypophosphorous acid: phosphorous acid is 9-12:5-7:4-6.

[0013] Preferably, the organic material is one or more of decomposed straw, decomposed livestock and poultry manure and decomposed humus.

[0014] Preferably, the organosilicon is prepared from components comprising the following molar ratios:

[0015] The ratio of methyltriethoxysilane: dimethyldiethoxysilane: vinyl MQ silicone resin is 6 to 8: 3 to 4: 1.

[0016] Preferably, the bacterial agent is Bacillus megaterium and Bacillus licheniformis;

[0017] The mass ratio of the Bacillus megaterium agent to the Bacillus licheniformis agent is 1-2:1-2;

[0018] The initial live bacterial concentration of the Bacillus megaterium inoculant is ≥3.0×10 10 cfu / g;

[0019] The initial live bacterial concentration of the Bacillus licheniformis agent is ≥3.0×10 10 cfu / g.

[0020] Preferably, the mineral powder comprises the following components in mass ratio:

[0021] The ratio of pumice powder: medical stone powder: vermiculite powder is 5-7:6-10:4-8.

[0022] Preferably, the synergist is prepared from components comprising the following mass ratios:

[0023] Catalase: urease: diluent is 3-8:5-10:90-98;

[0024] The initial enzyme activity of the catalase is ≥20 U / mg;

[0025] The initial enzyme activity of the urease is ≥10U / mg;

[0026] The diluent is humic acid.

[0027] The present invention also provides the use of the multifunctional saline-alkali soil conditioner in improving soil salinity and alkali properties and increasing crop yield and stress resistance.

[0028] The present invention also provides a method for improving saline-alkali soil, comprising the following steps: applying a multifunctional saline-alkali soil conditioner to the soil;

[0029] The multifunctional saline-alkali soil conditioner is the multifunctional saline-alkali soil conditioner;

[0030] The application amount is 30 to 180 kg / mu.

[0031] The invention provides a multifunctional saline-alkali soil conditioner and its application. The multifunctional saline-alkali soil conditioner comprises inorganic nitrogen and phosphorus fertilizers, mixed acid, potassium humate, organic materials, organosilicon, bacterial agent, mineral powder and synergist.

[0032] The inorganic nitrogen and phosphorus fertilizer and potassium humate of the present invention are the three essential nutrients for plant growth and development. Nitrogen (N) is a component of amino acids, proteins, chlorophyll and other important molecules in plants. Nitrogen is crucial to plant photosynthesis, helps the green development of plant leaves and the conversion of light energy. Nitrogen can also promote plant branching and leaf growth, and increase plant biomass. Phosphorus (P) is a key element for energy conversion in plants. It plays an important role in plant photosynthesis, respiration and storage of light energy; phosphorus can also promote the development of plant roots and improve the absorption capacity of plants for water and nutrients; in addition, phosphorus also has a positive effect on plant flower bud differentiation and fruit ripening. Potassium (K) is called "the nerve of plants". It participates in the activity regulation of multiple enzymes in plants and affects the metabolic process of plants; potassium helps plants regulate water and maintain cell osmotic pressure, and improves the drought and cold resistance of plants; potassium can also enhance the disease resistance of plants and promote the synthesis of starch and sugar in plants; the rational application of nitrogen, phosphorus and potassium can improve the yield and quality of crops and promote the healthy growth of plants.

[0033] The mixed acid in the multifunctional saline-alkali soil conditioner of the present invention comprises alginic acid, hypophosphorous acid and phosphorous acid. The mixed acid composed of these acids can react with the alkaline substances in the soil to adjust the soil pH value, improve the survival rate and growth of plants, and also create a more suitable living environment for soil microorganisms. Alginic acid, hypophosphorous acid and phosphorous acid can all act as electron acceptors or donors to participate in the metabolic process of soil microorganisms, and provide carbon sources and energy sources for microorganisms at the same time, promoting the growth and metabolism of microorganisms. In addition, there are often insoluble nutrients in saline-alkali soil, such as compounds of calcium, magnesium, phosphorus, etc. The mixed acid can react with these insoluble substances and convert them into soluble salts, thereby improving the effectiveness of nutrients in the soil and providing more nutrition for plants. The mixed acid can also dissolve some cementing substances in the soil, such as calcium carbonate, etc., so that soil particles are dispersed, soil porosity is increased, the structure and permeability of the soil are improved, the growth and development of plant roots is helped, and the water and fertilizer retention capacity of the soil is improved. At the same time, mixed acids combined with organic matter can form stable complexes, increase the cation exchange capacity of the soil, and also improve the soil's ability to retain fertilizer.

[0034] As organic materials decompose, nutrients are gradually released for plants to absorb and utilize; they help to form the structure of soil particles, increase soil porosity, make the soil looser, and improve soil aeration and drainage; they can absorb and retain water, increase soil water retention capacity, reduce water evaporation, and help plants survive under drought conditions; they can promote the growth and reproduction of microorganisms, and the activities of microorganisms help the decomposition of organic materials and the circulation of nutrients; they can enhance the soil's resistance to erosion, reduce soil erosion, and protect the soil surface; organic materials contain a variety of biologically active substances, such as hormones, enzymes, etc., which can promote plant growth and the health of soil ecosystems; they have a certain buffering capacity, can regulate the pH of the soil, maintain an appropriate pH range, and are beneficial to plant growth; they can combine with heavy metals and harmful substances in the soil to reduce their toxicity to plants and pollution to the environment.

[0035] Silicon can enhance the mechanical strength of plant cell walls, making plants stronger and more resistant to wind damage and lodging; it can enhance plant resistance to diseases and reduce the invasion of pathogens; it helps regulate the water balance in plants and enhance the drought resistance of plants; it improves the structure and function of leaves, indirectly promotes photosynthesis and increases the growth rate of plants; the organic silicon added in the present invention is composed of methyltriethoxysilane, dimethyldiethoxysilane and vinyl MQ organic silicon resin; methyltriethoxysilane can increase the free energy of the material surface through surface adsorption without changing the chemical properties of the material, thereby improving the wettability and adhesion of the material; dimethyldiethoxysilane is used as a structure control agent; and the vinyl MQ organic silicon resin is used as a tackifier. The organosilicon prepared by the present invention using methyltriethoxysilane, dimethyldiethoxysilane and vinyl MQ organosilicon resin can promote the aggregation of soil particles and form a good soil aggregate structure; at the same time, it has a certain hydrophilicity, can absorb and retain moisture in the soil, reduce the evaporation and loss of moisture (especially important for soil improvement in arid areas), can improve the water utilization efficiency of the soil, reduce the number of irrigation times and water consumption; moreover, some organosilicon can react with acidic or alkaline substances in the soil, adjust the pH of the soil, help to improve the effectiveness of nutrients in the soil, and promote the absorption and utilization of nutrients by plants. In addition, these organosilicon can combine with nutrient ions in the soil to form complexes that are easily absorbed by plants, improve the effectiveness and utilization of nutrients; and can also promote the growth and development of plant roots, increase the absorption area of ​​the roots, and improve the absorption capacity of plants for nutrients.

[0036] The microbial agent in the multifunctional saline-alkali soil conditioner of the present invention comprises bacillus megaterium microbial agent and bacillus licheniformis microbial agent, and both microbial agents can produce multiple enzymes and plant growth promoting substances, such as protease, amino acid, cytokinin, etc., which can enhance the cell viability of crops, accelerate the metabolism of crops, thereby increase the yield of crops and improve the quality of agricultural products. The invalid phosphorus in the soil can also be converted into quick-acting phosphorus, improve the utilization rate of phosphate fertilizer, and improve the soil environment. At the same time, it can be quickly planted around the plant root system and grow advantageously, and the chitinase secreted by it can quickly remove pathogenic bacteria and enhance the disease resistance of crops. At the same time, it can also promote the growth and development of rhizobia and root system, and improve the stress resistance of crops, such as cold resistance, drought resistance, lodging resistance, etc.

[0037] The mineral powder in the multifunctional saline-alkali soil conditioner of the present invention includes pumice powder, medical stone powder and vermiculite powder. Pumice powder is light in weight, high in strength, acid-alkali resistant, corrosion-resistant, pollution-free, with a porosity of 71.8-81% and a water absorption rate of 50-60%, which can reduce soil bulk density and increase soil porosity; medical stone powder is porous, has a very large surface, and has a strong adsorption and exchange effect; vermiculite powder is light in weight, has good water and fertilizer adsorption performance, has good cation exchange and adsorption, stores water and retains moisture, improves soil permeability and water content, and can also provide K, Mg, Ca, Fe and trace elements such as Mn, Cu, Zn, etc. contained in the crop itself. The water absorption, cation exchange and chemical composition characteristics of vermiculite make it play multiple roles such as fertilizer retention, water retention, water storage, air permeability and mineral fertilizer.

[0038] The multifunctional saline-alkali soil conditioner of the present invention further comprises a synergist prepared by combining catalase, urease and a diluent. Catalase can decompose hydrogen peroxide in the soil to reduce the toxicity of hydrogen peroxide. Urease exists in soil, bacteria, fungi and higher plants, and the urease-catalyzed product ammonia is one of the nitrogen sources of plants. Urease activity is positively correlated with the number of soil microorganisms, organic matter content, total nitrogen and available phosphorus content.

[0039] The multifunctional saline-alkali soil conditioner prepared by combining the above components can adjust the soil physical structure, reduce salt and alkali, promote the formation of aggregate structure, promote the healthy growth of crops, enhance stress resistance, and improve yield and quality, providing a basis for the harmless improvement of saline-alkali land. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the effect of multifunctional saline-alkali soil conditioner on the morphological characteristics of sunflower (the left picture shows the soil before improvement, and the right picture shows the growth of sunflower after improvement). DETAILED DESCRIPTION

[0041] The present invention provides a multifunctional saline-alkali soil conditioner, comprising the following components in parts by weight:

[0042] 10 to 20 parts of inorganic nitrogen and phosphorus fertilizers, preferably 12 to 18 parts, more preferably 15 parts;

[0043] 5 to 10 parts of mixed acid, preferably 6 to 9 parts, more preferably 8 parts;

[0044] Potassium humate 5-15 parts, preferably 7-13 parts, more preferably 10 parts;

[0045] 20-30 parts of organic material, preferably 22-28 parts, more preferably 25 parts;

[0046] 5 to 10 parts of organosilicon, preferably 6 to 9 parts, more preferably 7.5 parts;

[0047] 5 to 10 parts of bacterial agent, preferably 6 to 9 parts, more preferably 7.5 parts;

[0048] 15 to 30 parts of mineral powder, preferably 20 to 25 parts, more preferably 23 parts;

[0049] The amount of the synergist is 5 to 15 parts, preferably 7 to 13 parts, and more preferably 10 parts.

[0050] In the present invention, the inorganic nitrogen and phosphorus fertilizer has a nitrogen content of ≥18wt% and a phosphorus content of ≥10wt%.

[0051] In the present invention, the mixed acid comprises the following components in a mass ratio: alginic acid: hypophosphorous acid: phosphorous acid is 9-12:5-7:4-6, preferably 10:6:5. The mixed acid is prepared by weighing alginic acid, hypophosphorous acid and phosphorous acid according to a mass ratio and mixing them.

[0052] In the present invention, the organic material is one or more of decomposed straw, decomposed livestock and poultry excrement and decomposed humus. When the organic material is two or more of them, the ratio between the different organic materials is not limited.

[0053] In the present invention, the organosilicon is prepared from components including the following molar ratios:

[0054] The ratio of methyltriethoxysilane: dimethyldiethoxysilane: vinyl MQ silicone resin is 6-8:3-4:1, preferably 6:4:1. The preparation method of the silicone is: methyltriethoxysilane, dimethyldiethoxysilane and vinyl MQ silicone resin are mixed in molar ratio to obtain a silicon compound, the silicon compound is mixed with an acid catalyst, a polycondensation reaction is carried out to obtain a reaction product, and the reaction product is separated to obtain silicone. The acid catalyst is hydrochloric acid with a mass concentration of 5-20%, preferably 8% hydrochloric acid. The molar volume ratio of the silicon compound and the acid catalyst is 8-16 mol:1L, preferably 10-12 mol:1L, and more preferably 11 mol:1L; the temperature of the polycondensation reaction is 70-80°C, preferably 75°C; the time of the polycondensation reaction is 7-14h, preferably 8-11h, and more preferably 10h; the method of separating the reaction product is filtration or centrifugation.

[0055] In the present invention, the bacterial agent is a Bacillus megaterium agent and a Bacillus licheniformis agent;

[0056] The mass ratio of the Bacillus megaterium agent to the Bacillus licheniformis agent is 1-2:1-2, preferably 1:1;

[0057] The initial live bacterial concentration of the Bacillus megaterium inoculant is ≥3.0×10 10 cfu / g;

[0058] The initial live bacterial concentration of the Bacillus licheniformis agent is ≥3.0×10 10 cfu / g.

[0059] In the present invention, the mineral powder comprises the following components in a mass ratio: pumice powder: medical stone powder: vermiculite powder is 5-7:6-10:4-8, preferably 6:8:6.

[0060] In the present invention, the synergist is prepared from components including the following mass ratios:

[0061] Catalase: urease: diluent is 3-8:5-10:90-98, preferably 6:8:94;

[0062] The initial enzyme activity of the catalase is ≥20 U / mg;

[0063] The initial enzyme activity of the urease is ≥10U / mg;

[0064] The diluent is humic acid.

[0065] In the present invention, the preparation method of the multifunctional saline-alkali soil conditioner is: inorganic nitrogen and phosphorus fertilizers, mixed acid, potassium humate, organic materials, organosilicon, bacterial agent, mineral powder and synergist are uniformly mixed to obtain the multifunctional saline-alkali soil conditioner.

[0066] The present invention also provides the use of the multifunctional saline-alkali soil conditioner in improving soil salinity and alkali properties and increasing crop yield and stress resistance.

[0067] The present invention also provides a method for improving saline-alkali soil, comprising the following steps: applying a multifunctional saline-alkali soil conditioner to the soil;

[0068] The multifunctional saline-alkali soil conditioner is the multifunctional saline-alkali soil conditioner;

[0069] The application amount is 30-180 kg / mu, preferably 60-150 kg / mu, and more preferably 100 kg / mu.

[0070] The solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0071] The inorganic nitrogen and phosphorus fertilizer described in the embodiment of the present invention has a nitrogen content of 20 wt % and a phosphorus content of 13 wt %.

[0072] In the embodiment of the present invention, the initial live bacteria concentration of the Bacillus megaterium agent is ≥4.0×10 10 cfu / g, the initial live bacterial concentration of Bacillus licheniformis inoculant was 6.0×10 10 cfu / g.

[0073] In the embodiment of the present invention, the initial enzyme activity of catalase is 25 U / mg, and the initial enzyme activity of urease is 16 U / mg.

[0074] In the embodiment of the present invention, the average content of organic matter in the decomposed straw is 12%; the average content of organic matter in the decomposed livestock and poultry manure is 15%; and the average content of organic matter in the decomposed humus is 24%.

[0075] The present invention has no particular limitation on the sources of the products described in the embodiments, and any of the products may be commercially available products known in the art or obtained using known methods.

[0076] Example 1

[0077] Take 4.8 kg of alginic acid, 2.0 kg of hypophosphorous acid and 2.2 kg of phosphorous acid and mix them evenly to obtain a mixed acid.

[0078] Take 8 kg of decomposed straw, 10 kg of decomposed livestock and poultry manure and 4 kg of decomposed humus, mix them evenly, and obtain organic material for later use.

[0079] Take 3 kg of Bacillus megaterium inoculant and 3 kg of Bacillus licheniformis inoculant and mix them evenly to obtain an inoculant for later use.

[0080] Methyltriethoxysilane, dimethyldiethoxysilane and vinyl MQ silicone resin were mixed in a molar ratio of 6:4:1 to obtain a silicon compound. 8wt% hydrochloric acid solution was added to the silicon compound, and the molar volume ratio of the silicon compound to the hydrochloric acid solution was 11mol:1L. After that, polycondensation reaction was carried out at 75°C for 11h, and centrifugation was performed to obtain silicone. Analysis and testing determined that the composition, content and performance of silicone met the requirements of NY-T 797-2004 silicon fertilizer and DB1304 / T 352-2020 general technical conditions for silicone soil conditioners. After testing, the silicon content (in terms of SiO2) of the silicone was ≥10.0%.

[0081] Take 6kg of pumice powder, 8kg of medical stone powder and 6kg of vermiculite powder and mix them evenly to obtain mineral powder.

[0082] 0.3 kg of catalase, 1.0 kg of urease and 9.0 kg of humic acid were mixed evenly to obtain a synergist.

[0083] The mixed acid, organic material, bacterial agent, mineral powder, synergist, 10 kg of the organosilicon prepared above, 15 kg of potassium humate, and 10 kg of inorganic nitrogen and phosphorus fertilizers obtained above are uniformly mixed to obtain a multifunctional saline-alkali soil conditioner.

[0084] Example 2

[0085] Take 2.7 kg of alginic acid, 1.8 kg of hypophosphorous acid and 1.8 kg of phosphorous acid and mix them evenly to obtain a mixed acid.

[0086] Take 15 kg of decomposed straw and 15 kg of decomposed livestock and poultry manure and mix them evenly to obtain organic material for later use.

[0087] Take 4 kg of Bacillus megaterium inoculant and 6 kg of Bacillus licheniformis inoculant and mix them evenly to obtain an inoculant for later use.

[0088] Prepare organosilicon according to the method of Example 1 and set aside.

[0089] Take 5kg of pumice powder, 6kg of medical stone powder and 5kg of vermiculite powder and mix them evenly to obtain mineral powder.

[0090] 0.4 kg of catalase, 0.25 kg of urease and 4.5 kg of humic acid were mixed evenly to obtain a synergist.

[0091] The mixed acid, organic material, bacterial agent, mineral powder, synergist, 8 kg of organosilicon, 5 kg of potassium humate, and 15 kg of inorganic nitrogen and phosphorus fertilizers obtained above are uniformly mixed to obtain a multifunctional saline-alkali soil conditioner.

[0092] Example 3

[0093] Take 5.5 kg of alginic acid, 2.5 kg of hypophosphorous acid and 2.0 kg of phosphorous acid and mix them evenly to obtain a mixed acid.

[0094] 10 kg of decomposed livestock and poultry manure and 10 kg of decomposed humus are mixed evenly to obtain organic materials for later use.

[0095] Take 2.5 kg of Bacillus megaterium inoculant and 2.5 kg of Bacillus licheniformis inoculant and mix them evenly to obtain an inoculant for later use.

[0096] Prepare organosilicon according to the method of Example 1 and set aside.

[0097] Take 9 kg of pumice powder, 9 kg of medical stone powder and 12 kg of vermiculite powder and mix them evenly to obtain mineral powder.

[0098] 0.4 kg of catalase, 1.2 kg of urease and 13 kg of humic acid were mixed evenly to obtain a synergist.

[0099] The mixed acid, organic material, bacterial agent, mineral powder, synergist, 5 kg of organosilicon, 10 kg of potassium humate, and 20 kg of inorganic nitrogen and phosphorus fertilizers obtained above are uniformly mixed to obtain a multifunctional saline-alkali soil conditioner.

[0100] Experimental Example 1

[0101] The test site is located at the base of Bayannur Agricultural and Animal Husbandry Science Research Institute. The original soil pH value is 8.9 and the salt content is 6.2g / kg. The test plant is sunflower. The multifunctional saline-alkali soil conditioner of Example 1 is set with three concentration gradients, each with 3 replicates, and 9 plots of test fields are set, each with 5×5=25m 2 The three concentration gradients were CK (0kg / plot), T1 (2.5kg / plot), and T2 (5.0kg / plot). The soil salt content and pH value were measured to characterize the changes in soil salinity and acidity. After 60 days of treatment, 5 soil samples and plant samples were randomly collected from each plot, and then the calculated average value was used to determine the improvement effect of the multifunctional saline-alkali soil conditioner on saline-alkali soil.

[0102] (1) Effects of multifunctional saline-alkali soil conditioner on the salt content and pH of experimental soil

[0103] The cations in saline-alkali soil in the experimental area are mainly Na + , K + , Ca 2+and Mg 2+ Mainly, the multifunctional saline-alkali soil conditioner of Example 1 was applied to the test plot according to the above method, and the change of soil salt content was used to characterize the change of soil cations. The measurement results are shown in Table 1.

[0104] Table 1 Effects of multifunctional saline-alkali soil conditioner on salt content and pH of test soil

[0105] deal with Salt content (g / kg) pH CK 5.9 8.7 T1 3.7 8.3 T2 1.9 7.8

[0106] As shown in Table 1, within the concentration range of the experimental design, as the concentration of the multifunctional saline-alkali soil conditioner increases, the soil salt content decreases significantly, and the soil pH also decreases significantly, indicating that the multifunctional saline-alkali soil conditioner has a good effect on reducing salt and removing alkali from the soil. The multifunctional saline-alkali soil conditioner of the present invention has a very obvious improvement effect on saline-alkali soil, but it is still necessary to determine the application amount according to the soil fertility of the saline-alkali soil and the crops to achieve a better improvement effect, thereby solving the saline-alkali soil problem.

[0107] (2) Effects of multifunctional saline-alkali soil conditioners on the morphological characteristics of sunflower

[0108] Sunflowers were planted in the saline-alkali soil that had been improved for 15 days, and the morphological characteristics of the sunflowers were measured to determine the improvement effect. The data obtained are shown in Table 2. The pictures of sunflowers planted for 25 days after being improved with 2.5 kg / plot are shown in Table 2. Figure 1 shown.

[0109] Table 2 Effects of multifunctional saline-alkali soil conditioners on morphological characteristics of sunflower

[0110]

[0111] Table 2 and Figure 1 It shows that after applying the multifunctional saline-alkali soil conditioner, the morphological characteristics of sunflowers increased significantly, which indicates that the soil improved by the multifunctional saline-alkali soil conditioner alleviates the saline-alkali stress on sunflowers and increases the biomass of sunflowers.

[0112] As can be seen from the above embodiments, the present invention provides a multifunctional saline-alkali soil conditioner and its application. The multifunctional saline-alkali soil conditioner of the present invention comprises inorganic nitrogen and phosphorus fertilizers, mixed acid, potassium humate, organic materials, organosilicon, bacterial agent, mineral powder and synergist. The multifunctional saline-alkali soil conditioner prepared according to the above components can regulate the physical structure of the soil, reduce salt and alkali, promote the formation of aggregate structure, promote the healthy growth of crops, enhance stress resistance, and improve yield and quality. It provides a basis for the harmless improvement of saline-alkali land.

[0113] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional saline-alkali soil conditioner, characterized in that: The composition includes the following components in parts by weight: 10-20 parts of inorganic nitrogen and phosphorus fertilizers, 5-10 parts of mixed acid, 5-15 parts of potassium humate, 20-30 parts of organic materials, 5-10 parts of organosilicon, 5-10 parts of bacterial agent, 15-30 parts of mineral powder, and 5-15 parts of synergist.

2. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The inorganic nitrogen and phosphorus fertilizer has a nitrogen content of ≥18wt% and a phosphorus content of ≥10wt%.

3. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The mixed acid comprises the following components in mass ratio: The ratio of alginate: hypophosphorous acid: phosphorous acid is 9-12:5-7:4-6.

4. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The organic material is one or more of decomposed straw, decomposed livestock and poultry excrement and decomposed humus.

5. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The organosilicon is prepared from components including the following molar ratios: The ratio of methyltriethoxysilane: dimethyldiethoxysilane: vinyl MQ silicone resin is 6 to 8: 3 to 4:

1.

6. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The bacterial agent is a Bacillus megaterium agent and a Bacillus licheniformis agent; The mass ratio of the Bacillus megaterium agent to the Bacillus licheniformis agent is 1-2:1-2; The initial live bacterial concentration of the Bacillus megaterium inoculant is ≥3.0×10 10 cfu / g; The initial live bacterial concentration of the Bacillus licheniformis agent is ≥3.0×10 10 cfu / g.

7. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The mineral powder comprises the following components in mass ratio: The ratio of pumice powder: medical stone powder: vermiculite powder is 5-7:6-10:4-8.

8. The multifunctional saline-alkali soil conditioner according to claim 1, characterized in that: The synergist is prepared from components including the following mass ratios: Catalase: urease: diluent is 3-8:5-10:90-98; The initial enzyme activity of the catalase is ≥20 U / mg; The initial enzyme activity of the urease is ≥10U / mg; The diluent is humic acid.

9. Use of the multifunctional saline-alkali soil conditioner according to any one of claims 1 to 8 in improving soil salinity and alkalinity, and increasing crop yield and stress resistance.

10. A method for improving saline-alkali soil, characterized in that: The method comprises the following steps: applying a multifunctional saline-alkali soil conditioner to the soil; The multifunctional saline-alkali soil conditioner is the multifunctional saline-alkali soil conditioner according to any one of claims 1 to 8; The application amount is 30 to 180 kg / mu.

Images