Saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions and preparation method of saline-alkali soil fertilizer

Abstract

The invention discloses a saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions and a preparation method of the saline-alkali soil fertilizer, and belongs to the technical field of agricultural fertilizers. The fertilizer takes a nitrogen source, a phosphorus source, a potassium source, a silicon source, organic matters, a synergistic additive, a soil conditioning substance and a liquid microbial agent as raw materials, and through scientific formula design and a preparation process, the soil environment of the saline-alkali soil can be effectively improved, the growth of crop roots is promoted, and the yield and quality of crops are improved. The preparation method comprises the following steps: crushing, mixing, granulating, drying, cooling and screening raw materials such as a quick-acting nitrogen source, a phosphorus source, a potassium source and a silicon source to prepare quick-acting nutrient particles; spraying a liquid microbial agent on the outer surface of the granular organic matter, and adding a soil conditioning substance and a synergistic additive to prepare functional particles; and finally, mixing the quick-acting nutrient particles, the slow-release nitrogen source and the functional particles in proportion to obtain the fertilizer. The fertilizer has multiple effects of nutrient slow release, root growth promotion and soil improvement, and is especially suitable for agricultural production of saline-alkali soil.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a saline-alkali land fertilizer with nutrient slow-release and root-promoting functions and a preparation method thereof. Background Art

[0002] In modern agricultural production, soil issues have always been a key factor affecting crop growth and yield. Saline-alkali land, a special type of soil, is characterized by excessive amounts of soluble salts, typically including sodium chloride, sulfates, carbonates, and nitrates. Saline-alkali land is widely distributed globally, particularly in arid and semi-arid regions. Due to the poor soil structure, poor water and fertilizer retention capacity, and low microbial activity in saline-alkali land, crops grown in such soils often grow poorly and suffer low yields, severely limiting the sustainable development of local agriculture.

[0003] Traditional chemical fertilizers present numerous challenges when used in saline-alkali soils. First, the high salinity of saline-alkali soils increases the concentration of mineral ions in the soil, interfering with plant absorption and utilization of fertilizer nutrients. Second, excessive inorganic salts further damage the soil structure, causing soil compaction and weakening its ability to breathe and retain water. This not only affects the effective supply of nutrients but also restricts the development of plant roots. Furthermore, traditional fertilizers often have a high rate of rapid release and are prone to erosion, resulting in inefficient nutrient utilization and environmental pollution.

[0004] To overcome these challenges, developing fertilizers specifically for saline-alkali soils is urgent and crucial. An ideal solution should simultaneously address soil conditioning, improve fertilizer nutrient availability and utilization, promote crop root growth, and enhance overall crop quality and yield. The key to improving saline-alkali soil conditions is to reduce the negative impact of salt, enhance soil aggregate structure, improve aeration, and enhance water and nutrient retention, thereby creating more favorable conditions for crop growth. Regarding nutrient supply, developing fertilizer ingredients with slow-release properties can ensure a continuous and stable supply of nutrients to plants throughout their growth cycle.

[0005] In order to solve the above problems, the present invention provides a fertilizer specifically for use in saline-alkali land and having nutrient slow-release and root-promoting functions, and a preparation method thereof. The fertilizer adopts a scientific formula, contains elements such as nitrogen, phosphorus, potassium, and combines silicon sources, organic matter, soil conditioners, microbial agents and other synergistic additives to form a comprehensive nutrient supply system. Through this formula, not only the basic nutrients required for plant growth are provided, but also microbial agents are used to improve the soil microecological environment, enhance the soil's self-recovery and nutrient recycling capabilities. In addition, soil conditioners added to the fertilizer, such as peat, can optimize the soil structure, which is beneficial to soil water retention and nutrient retention, and further create a good soil environment for crop growth.

[0006] In terms of slow-release nutrients, the fertilizer of the present invention utilizes slow-release nitrogen fertilizers such as large-particle urea coated with degradable polymer materials to ensure the gradual release of nutrients, and the slow-release period can reach 28 to 120 days. Compared with traditional quick-acting fertilizers, this type of slow-release fertilizer can significantly improve fertilizer utilization and reduce nutrient loss. In addition, the addition of organic matter is also conducive to increasing the organic matter content in the soil, which not only improves soil fertility but also enhances the diversity and activity of soil organisms. Organic raw materials can use animal-derived proteins or plant-derived proteins, etc., and their decomposition process in the soil can release more nitrogen, phosphorus, potassium and other elements that are beneficial to crop growth.

[0007] The role of synergists in fertilizers cannot be underestimated. For example, amino acids, humic acid, and betaine can increase crop nutrient absorption efficiency, improve plant physiological functions, and promote root development. Biostimulants like algal oligosaccharides and chitosan can stimulate plant resistance and enhance crop tolerance to saline-alkali stress.

[0008] In summary, the fertilizer of the present invention achieves dual optimization of soil improvement and crop nutrient supply in saline-alkali land through its triple effects of nutrient supply, soil improvement, and biostimulation, significantly improving the efficiency of agricultural product production in saline-alkali land and possessing a very broad application prospect. Furthermore, the fertilizer's simple preparation method facilitates its application in actual production, further highlighting its practical value and socioeconomic benefits. This invention also provides important guidance and reference value for future soil remediation and agricultural development. Summary of the Invention

[0009] 1. Problems to be solved

[0010] In response to the problems existing in the above-mentioned prior art, the present invention provides a saline-alkali land fertilizer with nutrient slow-release and root-promoting functions and a preparation method thereof. The prepared fertilizer can effectively improve the soil environment of saline-alkali land, promote the growth of crop roots, and increase crop yield and quality.

[0011] 2. Technical solution

[0012] To solve the above problems, the present invention adopts the following technical solutions.

[0013] A saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions, comprising the following raw materials in parts by weight:

[0014]

[0015] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0016]

[0017]

[0018] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0019] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0020] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0021]

[0022]

[0023] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0024]

[0025] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions, wherein the nitrogen source is one or more of a quick-acting nitrogen source and a slow-release nitrogen source; wherein the quick-acting nitrogen source is one or more of urea, ammonium sulfate, ammonium carbonate, ammonium molybdate, agricultural ammonium nitrate, calcium cyanamide, and urea ammonium nitrate solution; wherein the slow-release nitrogen source is at least one of granular oxamide, coated urea, and stabilized urea;

[0026] The coated urea is polyurethane coated urea or sulfur coated urea, wherein the nitrogen content of polyurethane coated urea is ≥44% and the sustained release period is 28d-120d; the nitrogen content of sulfur coated urea is 31%-45% and the sulfur content is 8.0%-25%.

[0027] The stable urea is urea containing urease inhibitor, and the urea residual difference rate is ≥25%;

[0028] The phosphorus source is one or more of monoammonium phosphate, diammonium phosphate, ammonium polyphosphate, superphosphate, calcium magnesium phosphate, nitroammonium phosphate, urea phosphate, and pyrophosphate;

[0029] The potassium source is selected from one or more of potassium dihydrogen phosphate, potassium sulfate, potassium nitrate, potassium formate, potassium chloride, potassium hydroxide, and potassium carbonate;

[0030] The silicon source is selected from silicon powder, calcium silicate or sodium metasilicate;

[0031] The organic matter is organic waste, fermented and decomposed carbon-containing organic materials; the organic waste is a rich protein component of animal and / or plant origin, and is one or more of chicken and duck intestines, chicken and duck skin, blood, animal residues or impurities, straw, mushroom residue, and agricultural product processing scraps;

[0032] The synergistic adjuvant is at least one of amino acids, fulvic acid, sodium salicylate, betaine, alginic oligosaccharide, alginic acid, chitin, chitosan, chitosan oligosaccharide, and astaxanthin; the amino acid is at least one of glutamic acid, γ-aminobutyric acid, polyglutamic acid, and polyaspartic acid;

[0033] The soil conditioning material is at least one of woody peat, zeolite powder, bentonite, and attapulgite;

[0034] The liquid microbial agent includes at least one of a bacterial agent and a fungal agent, wherein the bacterial agent is at least one of Pseudomonas, Bacillus, and Micromonospora; and the fungus is at least one of Aspergillus, Penicillium, and Trichoderma.

[0035] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0036] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0037] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0038] c. Mix the quick-acting nutrient granules, slow-release nitrogen source and functional granules in proportion to obtain fertilizer

[0039] 3. Beneficial effects

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The fertilizer of the present invention adopts a carefully designed formula, which includes the three major nutrients of nitrogen, phosphorus and potassium that are crucial to plant growth. Nitrogen helps to promote chlorophyll formation and protein synthesis in crops, phosphorus is crucial to root development and energy conversion in plants, and potassium is involved in water regulation and disease resistance enhancement in crops. The silicon source in this fertilizer can effectively alleviate the effects of saline-alkali stress, enhance the mechanical strength and disease resistance of plants, and the organic matter component is more conducive to improving soil fertility and improving soil structure. Synergistic adjuvants such as natural substances such as amino acids and humic acid can significantly increase the absorption rate of nutrients by crops. Soil conditioning substances can improve the physical properties of the soil and improve its water retention capacity. Liquid microbial agents can not only promote the growth of crop roots, but also enhance the release of nutrients in the soil, and improve the diversity and stress resistance of crops.

[0042] When the fertilizer of the present invention is used under saline-alkali soil conditions, the root system of crops can penetrate the soil more deeply and absorb more water and nutrients extensively. The silicon source and soil conditioning substances in the fertilizer work synergistically to significantly reduce the salt ion concentration in the soil, enhance the soil aggregate structure, improve soil permeability, and improve the root zone microenvironment, thereby effectively improving the agricultural production capacity of saline-alkali land. By improving the fertilizer composition, the present invention can significantly improve the water and fertilizer retention capacity of the soil. Organic matter and soil conditioning substances such as peat and zeolite powder can effectively increase the porosity of the soil, promote the retention of water and nutrients in the soil, reduce nutrient loss, and ensure that crops obtain a smooth and continuous supply of nutrients during growth. After using the fertilizer of the present invention, the root system of crops can develop more quickly and robustly, absorb more water and nutrients, promote more lush green leaves of crops, and photosynthesis is more efficient, thereby driving the rapid growth of the entire plant and further improving crop yield and quality. The improvement in the nutrient absorption rate of crops is directly reflected in the significant enhancement of the taste, color, nutritional value, etc. of the fruit. The production process of the fertilizer of the present invention is simple, using common raw materials and ordinary processing equipment, and does not require expensive equipment investment and complex production technology. This greatly reduces production costs and makes this fertilizer highly competitive in the market.

[0043] In view of the widespread existence of saline-alkali land and its significant impact on agricultural production, the development of fertilizers suitable for such soil conditions is extremely urgent. The fertilizer provided by the present invention not only solves the above-mentioned problems, but also provides the possibility of increasing production and efficiency, and therefore has a wide range of market demand in many countries and regions around the world. Moreover, with the increasing attention paid to ecological agriculture and sustainable development, eco-friendly and comprehensive fertilizers such as the one provided by the present invention will become more and more popular. In short, the present invention not only provides an effective means to solve the agricultural problems of saline-alkali land, but also helps to improve global food security and ecological balance through sustainable agricultural practices. Through such product innovation and technological progress, modern agriculture can be promoted to develop in a more green, environmentally friendly and efficient direction. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to specific examples. It should be noted that the strains involved in this patent were all purchased from preservation centers or public merchants, and are not new strains for preservation.

[0045] Example 1

[0046] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0047]

[0048] The nitrogen source includes fast-acting and slow-release nitrogen sources (the weight ratio between the fast-acting and slow-release nitrogen sources is 11:4), wherein the fast-acting nitrogen source is urea; the slow-release nitrogen source is selected from coated urea, and the coated urea is sulfur-coated urea with a urea nitrogen content of 40% and a sulfur content of 8.0%.

[0049] The phosphorus source is monoammonium phosphate;

[0050] The potassium source is selected from potassium dihydrogen phosphate;

[0051] The silicon source is selected from silicon powder;

[0052] The organic matter is organic waste, which is fermented and decomposed carbon-containing organic material; the organic waste is the intestines of chickens and ducks;

[0053] The synergistic adjuvant is an amino acid; the amino acid is glutamic acid;

[0054] The soil conditioning material is woody peat;

[0055] The liquid microbial agent is a mixture of Pseudomonas fluorescens and Bacillus amyloliquefaciens in a mass ratio of 1:1.

[0056] The following two strains can be obtained from the corresponding preservation center or Guangdong Institute of Microbiology.

[0057] Pseudomonas fluorescens, strain number: CGMCC No. 3227. This strain is deposited with the General Microbiology Center of the China National Center for the Collection of Microorganisms and is classified as Pseudomonas fluorescens CKD18. Experiments have shown that it has high phosphate solubilization capabilities and can promote plant absorption of phosphorus, nitrogen, and potassium. Bacillus amyloliquefaciens, strain number: AS1.1099, is listed as a standard Bacillus amyloliquefaciens strain on Baidu Encyclopedia and has been shown to inhibit a variety of plant pathogens (such as Fusarium oxysporum and Escherichia coli).

[0058] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0059] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0060] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0061] c. Mix the fast-acting nutrient granules, coated urea and functional granules in proportion to obtain fertilizer.

[0062] Example 2

[0063] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions,

[0064] In parts by weight, it includes the following raw materials:

[0065]

[0066] The nitrogen source includes a fast-acting nitrogen source and a slow-release nitrogen source (the weight ratio between the fast-acting nitrogen source and the slow-release nitrogen source is 11:6), wherein the fast-acting nitrogen source is ammonium carbonate; the slow-release nitrogen source is selected from granular oxamide;

[0067] The phosphorus source is ammonium polyphosphate;

[0068] The potassium source is selected from potassium sulfate;

[0069] The silicon source is selected from calcium silicate;

[0070] The organic matter is organic waste, which is a fermented and decomposed carbon-containing organic material; the organic waste is straw;

[0071] The synergistic aid is fulvic acid;

[0072] The soil conditioning substance is zeolite powder;

[0073] The liquid microbial agent is prepared by mixing Bacillus megaterium and Bacillus subtilis in a mass ratio of 1:1.

[0074] The following two strains can be obtained from the corresponding preservation center or Guangdong Institute of Microbiology.

[0075] Bacillus megaterium strain, strain number: CGMCC No. 10803, source: isolated from soil on the farm of South China Agricultural University, deposited at the China General Microbiology Center (CGM CC). Bacillus subtilis strain, strain number: CGMCC 1.3358, source: a standard strain deposited at the China General Microbiology Center.

[0076] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0077] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0078] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0079] c. Mix the quick-acting nutrient granules, slow-release nitrogen source and functional granules in proportion to obtain fertilizer.

[0080] Example 3

[0081] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0082]

[0083] The nitrogen source includes fast-acting and slow-release nitrogen sources (the weight ratio between the fast-acting and slow-release nitrogen sources is 11:8), wherein the fast-acting nitrogen source is ammonium sulfate; the slow-release nitrogen source is selected from coated urea; the coated urea is polyurethane coated urea, wherein the nitrogen content of the polyurethane coated urea is ≥44% and the slow-release period is 28d-120.

[0084] The phosphorus source is superphosphate;

[0085] The potassium source is selected from potassium chloride;

[0086] The silicon source is selected from sodium metasilicate;

[0087] The organic matter is organic waste, fermented and decomposed carbon-containing organic materials; the organic waste is mushroom residue;

[0088] The synergistic adjuvant is brown algae oligosaccharide;

[0089] The soil conditioning substance is bentonite;

[0090] The liquid microbial agent is prepared by mixing Micromonospora and Aspergillus tubingensis in a mass ratio of 1:1.

[0091] The following two strains can be obtained from the corresponding preservation center or Guangdong Institute of Microbiology.

[0092] Micromonospora, strain number CPCC 205211 (deposited in China Pharmaceutical Microbiological Culture Collection Center). Trichoderma harzianum, strain number CGMCC No. 13163.

[0093] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0094] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0095] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0096] c. Mix the quick-acting nutrient granules, slow-release nitrogen source and functional granules in proportion to obtain fertilizer.

[0097] Example 4

[0098] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0099]

[0100] The nitrogen source includes fast-acting and slow-release nitrogen sources (the weight ratio between the fast-acting and slow-release nitrogen sources is 3:2), wherein the fast-acting nitrogen source is urea; the slow-release nitrogen source is stable urea, and the stable urea is urea containing urease inhibitors, and the urea residual difference rate is ≥25%;

[0101] The phosphorus source is ammonium nitrophosphate;

[0102] The potassium source is selected from potassium hydroxide;

[0103] The silicon source is selected from silicon powder;

[0104] The organic matter is organic waste, which is a fermented and decomposed carbon-containing organic material; the organic waste is straw;

[0105] The synergistic aid is alginic acid;

[0106] The soil conditioning substance is zeolite powder;

[0107] The liquid microbial agent is prepared by mixing Aspergillus tubingensis and Bacillus in a mass ratio of 1:1.

[0108] The following two strains can be obtained from the corresponding preservation center or Guangdong Institute of Microbiology.

[0109] Aspergillus tubingensis, strain number: ATCC 66876, source: American Type Culture Collection (ATCC). Bacillus subtilis, strain number: NCTC 3610, source: National Type Culture Collection (NCTC), UK.

[0110] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0111] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0112] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0113] c. Mix the quick-acting nutrient granules, slow-release nitrogen source and functional granules in proportion to obtain fertilizer.

[0114] Example 5

[0115] The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following raw materials in parts by weight:

[0116]

[0117] The nitrogen source includes fast-acting and slow-release nitrogen sources (the weight ratio between the fast-acting and slow-release nitrogen sources is 3:2), wherein the fast-acting nitrogen source is urea; the slow-release nitrogen source is selected from coated urea, and the coated urea is sulfur-coated urea with a urea nitrogen content of 40% and a sulfur content of 8.0%.

[0118] The phosphorus source is pyrophosphate;

[0119] The potassium source is selected from potassium carbonate;

[0120] The silicon source is selected from calcium silicate;

[0121] The organic matter is organic waste, fermented and decomposed carbon-containing organic materials; the organic waste is mushroom residue;

[0122] The synergistic adjuvant is astaxanthin;

[0123] The soil conditioning substance is bentonite;

[0124] The liquid microbial agent is prepared by mixing Pseudomonas, Bacillus and Trichoderma in a mass ratio of 1:1.

[0125] The following two strains can be obtained from the corresponding preservation center or Guangdong Institute of Microbiology.

[0126] Pseudomonas, strain number CICC 24858, source: China Industrial Culture Collection Administration Center (CICC); Bacillus subtilis CGMCC No. 7850, source: China General Culture Collection Administration Center (CGMCC); Trichoderma aspergillus CGMCC No. 19030, source: China General Culture Collection Administration Center (CGMCC).

[0127] The method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions comprises the following steps:

[0128] a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules;

[0129] b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying;

[0130] c. Mix the quick-acting nutrient granules and the functional granules in proportion to obtain fertilizer.

[0131] During preparation, special attention was paid to the grinding fineness and mixing uniformity of the raw materials to improve the overall performance of the fertilizer. The fertilizer of this embodiment has good comprehensive performance in terms of nutrient release and root promotion effect.

[0132] The above five embodiments are merely examples of specific implementations of the present invention. In actual production, appropriate adjustments may be made based on factors such as soil conditions and crop requirements. The scope of protection of the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

[0133] Comparative Example 1

[0134] Conventional fertilizers, specifically in parts by weight, include the following raw materials:

[0135] Nitrogen source (urea): 20 parts,

[0136] Phosphorus source (monoammonium phosphate): 15 parts,

[0137] Potassium source (potassium nitrate): 8 parts,

[0138] Organic matter (chicken intestines): 10 parts.

[0139] The preparation method is similar to that of Example 1, but no microbial agent and synergistic aid are added.

[0140] Comparative Example 2

[0141] Commercially available fertilizers, specifically in parts by weight, include the following raw materials:

[0142] Nitrogen source (ammonium carbonate): 15 parts,

[0143] Phosphorus source (superphosphate): 20 parts,

[0144] Potassium source (potassium formate): 7 parts,

[0145] Organic matter (mushroom residue): 80 parts,

[0146] Liquid microbial inoculant (Aspergillus): 8 parts.

[0147] The preparation method is simplified, and effective mixing of the microbial agent and the organic raw material is not required.

[0148] Comparative Example 3

[0149] Conventional compound fertilizer, specifically in parts by weight, includes the following raw materials:

[0150] Nitrogen source (ammonium sulfate): 25 parts,

[0151] Phosphorus source (ammonium polyphosphate): 10 parts,

[0152] Potassium source (potassium sulfate): 9 parts,

[0153] Silicon source (silicon powder): 0.2 parts,

[0154] Organic matter (agricultural product processing scraps): 12 parts.

[0155] During preparation, no special attention is paid to maintaining the activity of microbial agents, and this raw material does not contain any microbial agents.

[0156] Comparative Example 4

[0157] General fertilizer, specifically in parts by weight, includes the following raw materials:

[0158] Nitrogen source (urea and coated urea weight ratio 1:1): 30 parts,

[0159] Phosphorus source (calcium magnesium phosphate fertilizer): 5 parts,

[0160] Potassium source (potassium dihydrogen phosphate): 10 parts,

[0161] Silicon source (calcium silicate): 0.5 parts,

[0162] Organic matter (duck skin): 15 parts,

[0163] Synergist (γ-aminobutyric acid): 0.001 parts.

[0164] The blending ratio of the fast-acting nutrient granules and the functional granules is not optimized during preparation.

[0165] Comparative Example 5

[0166] Conventional compound fertilizers, specifically in parts by weight, include the following raw materials:

[0167] Nitrogen source (urea): 22 parts,

[0168] Phosphorus source (monoammonium phosphate): 18 parts,

[0169] Potassium source (potassium dihydrogen phosphate): 7.5 parts,

[0170] Silicon source (silicon powder): 0.5 parts,

[0171] Organic matter (chicken blood): 10 parts,

[0172] Synergist (betaine): 0.1 part.

[0173] During preparation, no attention is paid to the grinding fineness and mixing uniformity of the raw materials.

[0174] Test Case

[0175] Application effect and principle analysis:

[0176] Corn variety: Zhengdan 958;

[0177] Saline-alkali land parameters:

[0178] Soil type: saline-alkali soil;

[0179] Soil pH: 8.5

[0180] Soil salt content: 0.3%;

[0181] Organic matter content: 1.2%;

[0182] Soil texture: clay.

[0183] Example 1: Contains multiple nutrient sources and organic matter, as well as synergistic adjuvants and liquid microbial inoculants. Compared with other examples, the raw material selection and proportions are relatively conventional.

[0184] Example 2: Particularly suitable for growing phosphorus-intensive crops on saline-alkali soils. It utilizes a high ratio of phosphorus source and organic matter, along with a specific microbial agent. However, its overall performance in nutrient release and root growth promotion may be slightly inferior to the other examples.

[0185] Example 3: This product has a high nitrogen source content (25 parts), making it suitable for use on crops that require high nitrogen. Furthermore, it incorporates a combination of multiple microbial agents, potentially improving its effectiveness on saline-alkali soils. It is particularly suitable for growing crops on saline-alkali soils that require high silicon. It contains a specific silicon source and synergistic adjuvants, as well as a certain proportion of nitrogen, phosphorus, potassium, and organic matter. However, compared to the other examples, its microbial agent variety and activity retention may be slightly insufficient.

[0186] Example 4: The raw material selection is more diversified to meet the nutrient requirements of different crops. It contains a variety of nitrogen sources, phosphorus sources and potassium sources, as well as silicon sources, organic matter and synergistic adjuvants. The nitrogen source content is the highest (30 parts), but the phosphorus source content is lower (5 parts), which may be more suitable for crops with extremely high nitrogen requirements and low phosphorus requirements. In addition, the blending ratio of fast-acting nutrient granules and functional granules is optimized, which is expected to ensure the uniformity and effect of the fertilizer during application. The liquid microbial agent is a combination of Trichoderma and Bacillus, which contributes to the proliferation of beneficial microorganisms in the soil and plant health. The sources of organic matter include duck skin and straw, which provide a variety of nutrients.

[0187] Example 5: It has good comprehensive performance in nutrient release and root growth promotion. It combines multiple nitrogen sources, phosphorus sources, potassium sources, silicon sources, soil conditioning substances, organic matter and synergistic adjuvants.

[0188] Comparative Example 1: This fertilizer, which does not contain a silicon source, a synergist, or a liquid microbial inoculant, may have poorer nutrient release and root-promoting effects than Example 1. Silicon sources play an important role in improving plant stress resistance and promoting root growth, while synergists enhance the effectiveness and utilization of fertilizer nutrients. Liquid microbial inoculants help improve the soil microecological environment and promote plant growth. Therefore, the fertilizer in Comparative Example 1 may not be as effective as that in Example 1.

[0189] Comparative Example 2: Using a single microbial agent without a silicon source, its overall effectiveness may be weaker than that of Example 2. The multiple bacterial genera in the liquid microbial agent can work synergistically to enhance fertilizer effectiveness and soil improvement, while silicon sources also play a crucial role in improving plant stress resistance and promoting root growth. Therefore, the fertilizer in Comparative Example 2 may not be as effective as that in Example 2.

[0190] Comparative Example 3: This fertilizer contains no synergist or liquid microbial inoculant, and the silicon source ratio is reduced. This may result in a lower effectiveness compared to Example 3. Synergists can improve the effectiveness and utilization of fertilizer nutrients, while liquid microbial inoculants help improve the soil microecological environment and promote plant growth. An appropriate amount of silicon source also plays a significant role in enhancing plant stress resistance and promoting root growth. Therefore, the fertilizer in Comparative Example 3 may not be as effective as that in Example 3.

[0191] Comparative Example 4: The liquid microbial inoculant was omitted and the dosage of the synergist was reduced. This may have reduced the effectiveness of the fertilizer compared to Example 4. Liquid microbial inoculants can improve the soil microecological environment and promote plant growth, while synergists can increase the effectiveness and utilization of fertilizer nutrients. Therefore, the fertilizer in Comparative Example 4 may not be as effective as that in Example 4.

[0192] Comparative Example 5: The liquid microbial inoculant does not include the combination of multiple bacterial genera, and the types and amounts of silicon sources and synergists are reduced. Its overall effectiveness may be weaker than that of Example 5. The multiple bacterial genera in the liquid microbial inoculant can work synergistically to enhance fertilizer efficacy and soil improvement. Appropriate amounts of silicon sources and synergists also help improve fertilizer effectiveness and utilization. Therefore, the fertilizer of Comparative Example 5 may not be as effective as that of Example 5.

[0193] Compared with conventional fertilizers, the fertilizer of the present invention has the following advantages:

[0194] The addition of silicon source helps to meet the crops' demand for silicon and improve the crops' resistance to stress.

[0195] The introduction of synergistic adjuvants can enhance the nutrient slow-release effect of fertilizers and improve nutrient utilization.

[0196] The addition of liquid microbial agents helps improve the soil microbial environment and promote the growth and development of crop roots.

[0197] In addition, the preparation process of the present invention focuses on aspects such as the crushing fineness of the raw materials, mixing uniformity and maintaining the activity of the microbial agent, so as to improve the overall performance and application effect of the fertilizer.

[0198] The conventional fertilizers, commercially available fertilizers, conventional compound fertilizers, general-purpose fertilizers, and conventional compound fertilizers in the comparative examples are relatively simplified in terms of raw material selection, proportioning, and preparation processes. These fertilizers do not take into account the addition of a silicon source, the introduction of synergistic adjuvants, and the use of liquid microbial inoculants. Therefore, compared with the fertilizers of the present invention, these fertilizers in the comparative examples may be deficient in terms of nutrient supply, slow-release effect, and root-promoting function.

[0199] In summary, the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions of the present invention has been optimized and innovated in raw material selection, proportioning and preparation process, can provide better nutrient supply and root-promoting effect, and adapt to different soil conditions and crop requirements.

[0200] Table 1

[0201]

[0202]

[0203] The following table shows the ranking of indicators such as soil organic matter content and corn yield after application to corn fields:

[0204] Table 2

[0205]

[0206] The basic pattern of the test results is as follows: the soil with added organic matter has higher organic matter content, and the soil with added soil conditioners has lower total salt content; the root surface area is larger when synergistic substances are applied, which better reflects the effect of this fertilizer on the root growth of crops and soil improvement in saline-alkali land. The fertilizer is mainly made of nitrogen source, phosphorus source, potassium source, silicon source, organic matter, synergistic adjuvant and liquid microbial inoculant, mixed in a certain proportion. Among them, the nitrogen source includes fast-acting nitrogen fertilizer and slow-release nitrogen fertilizer to ensure a continuous supply of nutrients; phosphorus source and potassium source provide essential nutrients for plant growth; silicon source enhances plant resistance to stress; organic matter improves soil structure, acts as food for microorganisms, increases microbial survival rate, and promotes microbial activity; synergistic adjuvant improves fertilizer utilization; liquid microbial inoculant helps improve the soil microecological environment and promotes plant growth. In addition, soil conditioners are added to the fertilizer to further improve the soil conditions in saline-alkali land. The preparation method includes the steps of crushing, mixing, granulating, drying, cooling, and screening raw materials to obtain fast-acting nutrient granules; preparing a microbial agent; synthesizing functional granules from the microbial agent with organic matter, synergistic additives, and other raw materials; and finally, blending the fast-acting nutrient granules with the functional granules and slow-release urea in appropriate proportions to obtain the fertilizer. This fertilizer has multiple benefits, including slow nutrient release, root growth promotion, and soil improvement, making it particularly suitable for saline-alkali land improvement and crop cultivation.

[0207] The above content is a further detailed description of the present invention in conjunction with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions, characterized by: In parts by weight, it includes the following raw materials:

2. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: In parts by weight, it includes the following raw materials:

3. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: In parts by weight, it includes the following raw materials:

4. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: In parts by weight, it includes the following raw materials:

5. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: In parts by weight, it includes the following raw materials:

6. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: In parts by weight, it includes the following raw materials:

7. The saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions according to claim 1, characterized in that: The nitrogen source is one or more of a fast-acting nitrogen source and a slow-release nitrogen source; wherein the fast-acting nitrogen source is selected from one or more of urea, ammonium sulfate, ammonium carbonate, ammonium molybdate, agricultural ammonium nitrate, calcium cyanamide, and urea ammonium nitrate solution; wherein the slow-release nitrogen source is selected from at least one of granular oxamide, coated urea, and stabilized urea; The coated urea is polyurethane coated urea or sulfur coated urea, wherein the nitrogen content of polyurethane coated urea is ≥44% and the sustained release period is 28d-120d; the nitrogen content of sulfur coated urea is 31%-45% and the sulfur content is 8.0%-25%. The stable urea is urea containing urease inhibitor, and the urea residual difference rate is ≥25%; The phosphorus source is one or more of monoammonium phosphate, diammonium phosphate, ammonium polyphosphate, superphosphate, calcium magnesium phosphate, nitroammonium phosphate, urea phosphate, and pyrophosphate; The potassium source is selected from one or more of potassium dihydrogen phosphate, potassium sulfate, potassium nitrate, potassium formate, potassium chloride, potassium hydroxide, and potassium carbonate; The silicon source is selected from silicon powder, calcium silicate or sodium metasilicate; The organic matter is organic waste, fermented and decomposed carbon-containing organic materials; the organic waste is a rich protein component of animal and / or plant origin, and is one or more of chicken and duck intestines, chicken and duck skin, blood, animal residues or impurities, straw, mushroom residue, and agricultural product processing scraps; The synergistic adjuvant is at least one of amino acids, fulvic acid, sodium salicylate, betaine, alginic oligosaccharide, alginic acid, chitin, chitosan, chitosan oligosaccharide, and astaxanthin; the amino acid is at least one of glutamic acid, γ-aminobutyric acid, polyglutamic acid, and polyaspartic acid; The soil conditioning material is at least one of woody peat, zeolite powder, bentonite, and attapulgite; The liquid microbial agent includes at least one of bacterial agents and fungal agents, wherein the bacterial agent is at least one of Pseudomonas, Bacillus, and Micromonospora; the fungus is at least one of Aspergillus, Penicillium, and Trichoderma.

8. A method for preparing the saline-alkali soil fertilizer with nutrient slow-release and root-promoting functions as claimed in claim 1, characterized in that: The steps include: a. The nitrogen source, phosphorus source, potassium source, and silicon source are crushed, stirred and mixed, drum granulated, dried, cooled, and sieved to obtain fast-acting nutrient granules; b. Spray the liquid microbial agent onto the outer surface of the granular organic matter, add soil conditioning material, and then spray the synergistic agent after 20min of drumming, and obtain functional particles after low-temperature drying; c. Mix the quick-acting nutrient granules, slow-release nitrogen source and functional granules in proportion to obtain fertilizer.

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