Production method of multi-element liquid organic fertilizer for perennial root crops and liquid organic fertilizer

Abstract

The present invention relates to the technical field of soil improvement, and discloses a production method of a multi-element liquid organic fertilizer applied to perennial root crops and a liquid organic fertilizer. The method comprises: (1) mixing biomass waste and an industrial waste acid aqueous solution to make the biomass waste in an infiltrated state; (2) reacting at 100-300°C for 3-15 h in a high-pressure reactor under stirring; (3) adding a solid alkaline substance until the pH value is 7-14, and reacting again at 100-300°C for 3-15 h under stirring; (4) cooling the reaction product of step (3) to room temperature to obtain a liquid organic fertilizer; (5) mixing and diluting the liquid organic fertilizer with water to obtain a liquid organic fertilizer that can be applied to soil for planting perennial root crops. The method of the present invention is simple and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of soil improvement, and in particular to a production method of a multi-element liquid organic fertilizer applied to perennial root crops and the liquid organic fertilizer. Background Art

[0002] Perennial crops (sugarcane, fruit trees, leeks, flowers, etc.) refer to crops whose roots can overwinter underground and send out new young shoots in the second year after the above-ground parts of the plants wither in autumn and winter. They are usually removed or transplanted 3-5 years or even many years after planting. Perennial crops have a long life cycle and their root systems are generally deep (ranging from tens of centimeters to several meters). Perennial crops need to maintain soil fertility for a long time and deep in the soil during their growth period to maintain the continued growth and yield of the crops. However, due to the limitation that such crops cannot be fully plowed (for example, to prevent root damage) and conventional fertilization can only be applied to the soil surface, fertilizers cannot effectively enter the deep soil to act on perennial crops; in addition, for a long time, perennial crops have only adopted one-time nutrient input to support their multi-year growth. Even if furrow application or hole application is used for topdressing, it cannot fully act on the crop root system.

[0003] Most of the existing soil organic conditioners are solid organic fertilizers. When solid organic fertilizers are applied to perennial root crops, they will be intercepted by soil particles to varying degrees. In the case of non-tillage, they can only act on the surface soil, with limited actual effect. In addition, the nutrients are released slowly and cannot meet the rapid needs of crops in certain growth stages in a timely manner. In addition, the nutrients are single and cannot meet the balanced nutrient needs of crops. In addition, the application amount is large, and the cost and labor intensity are high. Long-term application of organic fertilizers has the risk of causing soil acidification.

[0004] Regarding the above-mentioned problems in soil improvement of perennial crops, people have found that liquid organic fertilizer can accurately solve these problems.

[0005] Existing methods for producing liquid organic fertilizers generally include: crushing different types of organic raw materials (such as livestock and poultry manure, crop straw, kitchen waste, humic acid, etc.) into small particles, deodorizing them separately, and then mixing them until the required nutrient ratio is reached, and then fermenting them to obtain metabolites; then obtaining a solid part and a liquid part by solid-liquid separation (such as screening or precipitation, etc.), wherein the solid part can be used as an organic fertilizer, and the liquid part is further processed (such as concentration and / or blending (adding appropriate amounts of inorganic nutrients such as nitrogen, phosphorus, potassium and / or pH adjusters)) and used as an improved liquid organic fertilizer.

[0006] However, the above-mentioned prior art methods have the problems of low humic acid yield and high solid product yield, which cannot maximize the utilization of biomass resources, waste resources, and even pollute the environment; and the production process of liquid organic fertilizer is cumbersome, labor-intensive, and time-consuming; at the same time, the consumption of water resources and other raw materials is relatively large, and the energy consumption is relatively large; and the nutrients are single and lack the supplement of nutrient elements. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a production method and liquid organic fertilizer of multi-element liquid organic fertilizer applied to perennial root crops. The method of the present invention has simple steps, short time consumption, reduced raw material cost, and significantly reduced the amount of unconverted solid residues. The soil-improving nutrients contained in the liquid organic fertilizer produced by the method of the present invention are more comprehensive and more balanced, and can almost completely enter the soil when applied to perennial root crop soil, and the entry depth is also deeper.

[0008] On the one hand, the present invention provides a method for producing a multi-element liquid organic fertilizer for perennial root crops, comprising the following steps: (1) placing biomass waste and an industrial waste acid aqueous solution in a high-pressure reactor and stirring them evenly to obtain a raw material mixture; wherein the weight ratio of the biomass waste to the industrial waste acid aqueous solution is such that the biomass waste is in an infiltrated state; (2) reacting the raw material mixture obtained in step (1) in a sealed high-pressure reactor at a temperature of 100-300° C. and under autogenous pressure for 3-15 h to obtain a product subjected to acid steam hydrothermal treatment; (3) cooling and depressurizing the product subjected to acid steam hydrothermal treatment obtained in step (2), then adding a solid alkaline substance thereto until the pH of the product subjected to acid steam hydrothermal treatment is 7-14, and then reacting again in the sealed high-pressure reactor at a temperature of 100-300° C. and under autogenous pressure for 3-15 h. h, obtaining a product subjected to alkaline steam hydrothermal treatment; (4) cooling the product subjected to alkaline steam hydrothermal treatment obtained in step (3) to room temperature to obtain liquid organic fertilizer; (5) mixing the liquid organic fertilizer obtained in step (4) with water to obtain a diluted alkaline liquid organic fertilizer that can be applied to soil for planting perennial root crops.

[0009] In the prior art methods, when the biomass is initially mixed with the acidic liquid, a large amount of liquid is usually added to keep the biomass in a suspended state, that is, the biomass is suspended on the surface of the acidic liquid.

[0010] In the production method of the present invention, in step (1), when adding biomass waste and industrial waste acid aqueous solution into the autoclave, too much water (industrial waste acid aqueous solution) should not be introduced, and the biomass waste should be in an infiltrated state in the industrial waste acid aqueous solution. The "infiltrated state" means that the industrial waste acid aqueous solution is attached to the surface of the biomass waste, so that the raw material mixture is in a steaming state when heated.

[0011] In the production method of the present invention, compared with the feed amount of the raw material biomass waste, the amount of the industrial waste acid aqueous solution added in step (1) is relatively small, and is only used to make the biomass waste in an infiltrated state, so that the acid "steam" hydrothermal treatment is carried out in step (1); and the alkaline substance added in step (3) is in solid state, so that the alkaline hydrothermal treatment carried out in step (3) is alkaline "steam" hydrothermal treatment.

[0012] In the production method of the present invention, the biomass waste is selected from one or more of crop straw, distiller's grains, sludge, rice husks, or kitchen waste, but is not limited thereto.

[0013] In the production method of the present invention, the "industrial waste acid aqueous solution" refers to a mixed solution of industrial waste acid and water. The industrial waste acid is selected from one or more of waste sulfuric acid, wood vinegar, or waste acetic acid, but is not limited thereto; the pH range of the industrial waste acid aqueous solution is relatively wide, with a pH value range of 0.1-4, such as a pH value range of 1-3, such as a pH value of 2.

[0014] In one embodiment of the production method of the present invention, in step (3), the alkaline substance is an alkaline mineral; the alkaline mineral is selected from one or more of carbide slag, magnesium oxide, red mud, quicklime, calcined shell powder, alkaline slag, or steel slag, but is not limited thereto.

[0015] In one embodiment of the production method of the present invention, in step (1), the weight ratio of the biomass waste to the industrial waste acid aqueous solution is less than 1:10. In step (1), the weight ratio of the biomass waste to the industrial waste acid aqueous solution can be 1:1 to 1:8, preferably 1:1 to 1:5, more preferably 1:1 to 1:3, for example 1:2, provided that the biomass waste is in an infiltrated state in the industrial waste acid aqueous solution.

[0016] In one embodiment of the production method of the present invention, in step (3), the weight ratio of biomass waste: alkaline substance is 1:0.1 to 1:30, preferably 1:0.1 to 1:20, more preferably 1:0.1 to 1:10, most preferably 1:0.1 to 1:1, for example 1:0.1 or 1:0.2 or 1:0.3 or 1:0.4 or 1:0.5 or 1:0.6 or 1:0.7 or 1:0.8 or 1:0.9 or 1:1.

[0017] In the production method of the present invention, the biomass waste, as a carbon-containing organic matter, provides an organic compound basis for the synthesis of humic acid; the acidic solution is used to adjust the reaction system to be acidic; the alkaline substance, on the one hand, acts as an alkaline stimulator to create alkaline conditions and adjust the reaction system to be alkaline, and on the other hand, when it is selected from alkaline minerals, it also provides a variety of mineral elements, such as calcium, magnesium, silicon, etc.

[0018] In one embodiment of the production method of the present invention, in step (5), the liquid organic fertilizer obtained in step (4) is mixed with water at a weight ratio of 1:(200-250) to obtain a diluted liquid organic fertilizer with a pH of 7.5-9.5, which is then applied to the soil where perennial root crops are planted. The liquid organic fertilizer product obtained directly has a high concentration, and applying it directly to the soil without dilution will "burn the seedlings". Therefore, the organic fertilizer can be diluted 200-250 times to facilitate its application to farmland soil.

[0019] In another aspect, the present invention provides a liquid organic fertilizer produced according to the method of the present invention, wherein the liquid organic fertilizer comprises organic matter and mineral elements.

[0020] In one embodiment of the liquid organic fertilizer of the present invention, the organic matter comprises humic acid; the mineral elements comprise soil-available calcium, soil-available magnesium, soil-available silicon and other elements necessary for plant growth.

[0021] In the liquid organic fertilizer of the present invention, "organic matter" is a broader concept, including all organic substances, including humic acid.

[0022] In one embodiment of the liquid organic fertilizer produced by the inventive method, the pH value of the liquid organic fertilizer after dilution 200 to 250 times is 7.5-9.5. The liquid organic fertilizer produced by the inventive method is alkaline and can be used for regulating soil acidity and alkalinity. In addition, the liquid organic fertilizer produced by the inventive method has a high nutrient concentration and is not suitable for being directly applied to the soil, and needs to be diluted and then applied to the soil.

[0023] In the method of the present invention, the "acid steam hydrothermal treatment" means steam hydrothermal treatment under acidic conditions. In the method of the present invention, the "alkaline steam hydrothermal treatment" means steam hydrothermal treatment under alkaline conditions.

[0024] The present invention can achieve the following beneficial effects:

[0025] 1. Compared with the traditional hydrothermal process, the method of the present invention adopts a steam hydrothermal method similar to "cooking porridge", which not only saves acid and alkali resources, saves water resources, but also improves the permeability of fertilizer nutrients into deep soil.

[0026] Different from the prior art method of first obtaining organic matter and then adding inorganic element nutrients to the organic matter, the method of the present invention can obtain a liquid organic fertilizer product containing both organic matter and mineral elements at one time. The combination of organic matter and mineral elements obtained by the method, the organic fertilizer component is supplemented with effective soil mineral elements, which synergize with the organic matter components (such as humic acid, etc.) to increase the permeability of fertilizer nutrients, which can not only improve the surface soil, but also improve the deep soil, and is more suitable for improving the soil of perennial root crops.

[0027] 2. When the method of the present invention is used to produce liquid organic fertilizer, the steam hydrothermal treatment has a fast reaction speed, the activity of organic matter is improved, and the dissolution rate of humic acid and the like is high.

[0028] Compared with the alkaline hydrothermal method alone, the production of liquid organic fertilizer using the method of the present invention can make the solubility of biomass waste reach 95.1%, the residual amount of solid product (hydrothermal charcoal) is reduced to 4.9%, and the residual amount of solid product (hydrothermal charcoal) is reduced by about 43%;

[0029] Compared with the prior art, the humic acid content in the liquid organic fertilizer product produced by the method of the present invention is also increased to varying degrees.

[0030] 3. The production method of the present invention does not require acid treatment after alkaline water heat treatment, and avoids the cumbersome acid recovery process after the acid treatment, thereby saving raw materials and simplifying the production process.

[0031] 4. The raw materials of the production method of the present invention are agricultural waste, industrial waste, etc., which not only has low cost but also realizes waste resource utilization, reduces environmental pollution, and meets the requirements of sustainable agricultural development.

[0032] 5. The production method of the present invention is suitable for large-scale implementation, the raw materials are easily available, the process is simple, no "three wastes" are generated, it is environmentally friendly, and the feasibility is very high.

[0033] 6. The organic fertilizer obtained by the method of the present invention is in liquid form and has balanced nutrients, significantly higher soil permeability of nutrients, and high utilization rate.

[0034] 7. The liquid organic fertilizer produced by the method of the present invention can be applied together with other liquid fertilizers to promote crop growth and improve the yield and quality of perennial root crops.

[0035] 8. The liquid organic fertilizer produced by the method of the present invention has a pH range of 7.5-9.5 after being diluted 200-250 times, which can improve acidic soil and balance soil acidity and alkalinity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a process flow chart of the method of the present invention.

[0037] Figure 2 This is a comparison chart showing the change of soil organic matter content with soil profile depth after applying the liquid organic fertilizers of Examples 1-2 of the present invention and Comparative Examples 1-2 to the soil where sugarcane is planted.

[0038] Figure 3 This is a comparison chart showing the change of effective calcium content in the soil with the depth of the soil profile after the liquid organic fertilizers of Examples 1-2 of the present invention and Comparative Examples 1-2 are applied to the soil where sugarcane is planted.

[0039] Figure 4 This is a comparison chart showing the change of effective magnesium content in the soil with soil profile depth after applying the liquid organic fertilizers of Examples 1-2 of the present invention and Comparative Examples 1-2 to the soil where sugarcane is planted.

[0040] Figure 5 This is a comparison chart showing the change of effective silicon content in the soil with the depth of the soil profile after the liquid organic fertilizers of Examples 1-2 of the present invention and Comparative Examples 1-2 are applied to the soil where sugarcane is planted.

[0041] Figure 6 It is a liquid organic fertilizer diagram of the present invention. DETAILED DESCRIPTION

[0042] The following will use Figure 1 The production method of the present invention is described in more detail with Examples 1-2.

[0043] Example 1

[0044] (1) Prepare raw materials. Dry and crush the brewer's grains. Then weigh the dried and crushed brewer's grains and a waste sulfuric acid aqueous solution with a pH value of 2 in a weight ratio of 1:3 and place them in a high-pressure reactor. In the high-pressure reactor, stir them evenly at room temperature, and the brewer's grains are in an infiltrated state to obtain a raw material mixture.

[0045] (2) Acid steam hydrothermal treatment. Turn on the stirring device, and allow the raw material mixture obtained in step (1) to undergo steam hydrothermal reaction at 190° C. under autogenous pressure at a stirring speed of 30 rpm for 5 hours to obtain a product (liquid mixture) subjected to acid steam hydrothermal treatment.

[0046] (3) Alkaline steam hydrothermal treatment. The product (liquid mixture) obtained in step (2) after the acid steam hydrothermal treatment is cooled and depressurized, and then solid alkaline mineral calcium carbide slag is added according to the weight ratio of brewer's grains to calcium carbide slag of 1:0.2 until the pH reaches 13. Then, in the sealed high-pressure reactor, the temperature is raised to 190° C. under stirring, and steam hydrothermal reaction is carried out under autogenous pressure conditions for 5 hours to obtain the product (liquid mixture) after the alkaline steam hydrothermal treatment.

[0047] (4) Cooling: The liquid mixture obtained in step (3) after the alkaline steam hydrothermal treatment is cooled to room temperature to obtain liquid organic fertilizer.

[0048] (5) Preparing an applicable fertilizer. The liquid organic fertilizer obtained in step (4) is uniformly mixed with water at a weight ratio of 1:200 to obtain a diluted liquid organic fertilizer that can be applied to the soil for growing sugarcane.

[0049] The production method of the present invention does not include the step of extracting humic acid precipitation separately. In the method of the present invention, on the one hand, humic acid is dissolved in liquid, which not only retains the original chemical properties and biological activity, but also because the liquid also contains mineral elements, organic matter (such as humic acid) and mineral elements are applied to the soil at the same time, which will cause complex reactions with each other, increase the permeability of mineral elements and organic matter in the soil (that is, nutrients and organic matter can be detected from deeper soil), and can penetrate deeper into the soil, which is conducive to the growth of perennial roots; on the other hand, the step of extracting humic acid again is omitted, and the method is simpler and more conducive to actual production.

[0050] Example 2

[0051] (1) Prepare raw materials. Dry and crush the brewer's grains. Then weigh the dried and crushed brewer's grains and a waste sulfuric acid aqueous solution with a pH value of 2 in a weight ratio of 1:3 and place them in a high-pressure reactor. In the high-pressure reactor, stir them evenly at room temperature, and the brewer's grains are in an infiltrated state to obtain a raw material mixture.

[0052] (2) Acid steam hydrothermal treatment. Turn on the stirring device, and allow the raw material mixture obtained in step (1) to undergo steam hydrothermal reaction at 190° C. under autogenous pressure at a stirring speed of 30 rpm for 5 hours to obtain a product (liquid mixture) subjected to acid steam hydrothermal treatment.

[0053] (3) Alkaline steam hydrothermal treatment. The product (liquid mixture) obtained in step (2) after the acid steam hydrothermal treatment is cooled and depressurized, and then solid alkaline substance sodium hydroxide powder is added according to the weight ratio of brewer's grains to sodium hydroxide of 1:0.2, and the pH is adjusted to 13. Then, in the sealed high-pressure reactor, the temperature is raised to 190° C. under stirring, and the steam hydrothermal reaction is carried out under autogenous pressure conditions for 5 hours to obtain the product (liquid mixture) after the alkaline steam hydrothermal treatment.

[0054] (4) Cooling: The liquid mixture obtained in step (3) after the alkaline steam hydrothermal treatment is cooled to room temperature to obtain liquid organic fertilizer.

[0055] (5) Preparing an applicable fertilizer. The liquid organic fertilizer obtained in step (4) is uniformly mixed with water at a weight ratio of 1:200 to obtain a diluted liquid organic fertilizer that can be applied to the soil for growing sugarcane.

[0056] Comparative Example 1

[0057] (1) Prepare raw materials. Dry and crush the brewer's grains. Then weigh the dried and crushed brewer's grains and waste sulfuric acid aqueous solution in a weight ratio of 1:10 and place them in a high-pressure reactor. Stir them evenly at room temperature in the high-pressure reactor to obtain a raw material mixture.

[0058] (2) Acid hydrothermal treatment. The aqueous solution of waste sulfuric acid is continued to be added to the raw material mixture obtained in step (1), and the pH value is adjusted to 2, and the brewer's grains are in a floating state. Then, the stirring device is turned on, and the hydrothermal reaction is carried out at a temperature of 190° C. under autogenous pressure conditions at a stirring speed of 30 rpm for 5 hours to obtain a liquid mixture that has been treated with acid hydrothermal treatment.

[0059] (3) Alkaline hydrothermal treatment. The acid hydrothermal treated liquid mixture obtained in step (2) is cooled and depressurized, and then sodium hydroxide powder is added according to a weight ratio of brewer's grains to sodium hydroxide of 1:0.2, and the pH is adjusted to 13. The temperature is then raised to 190° C. and a hydrothermal reaction is carried out under autogenous pressure for 5 hours to obtain an alkaline hydrothermal treated liquid mixture.

[0060] (4) Acidification treatment. Add 6 mol / L hydrochloric acid to the liquid reaction product mixture obtained in step (3) to adjust its pH to 1 to obtain a humic acid precipitate. Extract the humic acid precipitate by membrane filtration; the acidic filtrate after filtration is reused for the next acidification treatment.

[0061] (5) Preparation of an applicable fertilizer. The humic acid precipitate obtained in step (4) is uniformly mixed with water at a weight ratio of 1:200 (also liquid), to obtain a diluted liquid fertilizer that can be applied to the soil for growing sugarcane.

[0062] Comparative Example 2

[0063] (1) Prepare raw materials. Dry and crush the brewer's grains. Then weigh the dried and crushed brewer's grains and a sodium hydroxide solution with a pH value of 13 in a weight ratio of 1:10 and place them in a high-pressure reactor. Stir them evenly at room temperature in the high-pressure reactor to obtain a raw material mixture.

[0064] (2) Alkaline hydrothermal treatment: The raw material mixture obtained in step (1) is heated to 190° C. and subjected to hydrothermal reaction under autogenous pressure for 5 hours to obtain a liquid mixture subjected to alkaline hydrothermal treatment.

[0065] (3) Cooling: The liquid mixture obtained in step (2) after the alkaline hydrothermal treatment is cooled to room temperature to obtain liquid organic fertilizer.

[0066] (4) Preparing an applicable fertilizer. The liquid organic fertilizer obtained in step (3) is uniformly mixed with water at a weight ratio of 1:200 to obtain a diluted liquid organic fertilizer that can be applied to the soil for growing sugarcane.

[0067] The property data of the liquid organic fertilizer produced by Examples 1-2 and Comparative Examples 1-2 are shown in Table 1 below.

[0068]

[0069] In Table 1, dilution 250 times is the conventional method requirement for measuring pH value in the technical field of the present invention.

[0070] The method of the present invention is used to produce liquid organic fertilizer, which can improve the utilization efficiency of raw materials and increase the content of organic matter and effective mineral elements in the liquid phase of the liquid organic fertilizer.

[0071] From the data in Table 1 and Figure 2-6 It can be seen that the organic fertilizer produced by the method of the present invention is in liquid form, and its components also include organic matter (such as humic acid), mineral elements and other nutrients, and the content of each nutrient is significantly higher than that of Comparative Examples 1-2.

[0072] Also, see Figure 2-5 Medium R 2 The change trend line of the mark shows the change rate of each nutrient element infiltrating into the soil 0-50cm depth compared with the organic fertilizer of the prior art. From the change trend line, it can be seen that as the soil depth increases, the content of nutrient components such as organic matter and mineral elements of the organic fertilizer produced using the inventive method decreases more slowly.

[0073] In addition, in Example 1 of the present invention, there are three reasons for the increase of calcium, magnesium and silicon in the soil (calcium, magnesium, silicon and other elements exist in the soil, but the content is low): first, alkaline minerals, such as carbide slag, contain calcium, magnesium, silicon and other elements; second, biomass waste, such as brewer's grains, also contain calcium, magnesium, silicon, phosphorus and other elements, which are dissolved into biologically effective elements after hydrothermal treatment; third, after liquid organic fertilizer is applied to the soil, the presence of humic acid promotes the conversion of calcium, magnesium and silicon in the soil into an effective state.

[0074]

[0075] As can be seen from Table 2, the liquid organic fertilizer produced by the method of the present invention is particularly suitable for perennial root crops (such as sugarcane, etc.), can improve soil fertility, promote the growth of perennial root crops, increase the yield and quality of perennial root crops, and enhance economic benefits.

Claims

1. A method for producing a multi-element liquid organic fertilizer for perennial root crops, characterized in that: The following steps are involved: (1) placing biomass waste and an aqueous solution of industrial waste acid in a high-pressure reactor and stirring them uniformly to obtain a raw material mixture; wherein the weight ratio of the biomass waste to the aqueous solution of industrial waste acid is such that the biomass waste is in an infiltrated state; (2) reacting the raw material mixture obtained in step (1) in the sealed high-pressure reactor at 100-300° C. and autogenous pressure for 3-15 h under stirring to obtain a product subjected to acid steam hydrothermal treatment; (3) adding a solid alkaline substance to the acid steam hydrothermal treatment product obtained in step (2) until the pH of the acid steam hydrothermal treatment product is 7-14, and then reacting again for 3-15 hours in the sealed high-pressure reactor at a temperature of 100-300° C. and under autogenous pressure conditions under stirring to obtain a product subjected to alkali steam hydrothermal treatment; (4) cooling the product obtained in step (3) after the alkaline steam hydrothermal treatment to room temperature to obtain liquid organic fertilizer; (5) mixing the liquid organic fertilizer obtained in step (4) with water to obtain a diluted alkaline liquid organic fertilizer that can be applied to soil for planting perennial crops; Wherein, in step (1), the weight ratio of the biomass waste to the industrial waste acid aqueous solution is 1:1 to 1:8; Wherein, the biomass waste is selected from brewer's grains; Wherein, the solid alkaline substance is selected from one or more of carbide slag, quicklime and calcined shell powder.

2. The production method according to claim 1, characterized in that In step (3), the weight ratio of biomass waste to solid alkaline substance is 1:0.1 to 1:

30.

3. The production method according to claim 2, characterized in that: In step (3), the weight ratio of biomass waste: solid alkaline substance is 1:0.1 to 1:

20.

4. The liquid organic fertilizer produced according to any one of claims 1 to 3, characterized in that The liquid organic fertilizer comprises organic matter and mineral elements; Wherein, the organic matter comprises humic acid; and the mineral elements comprise soil-available calcium, soil-available magnesium and soil-available silicon.

5. Liquid organic fertilizer according to claim 4, characterized in that, The pH value of the liquid organic fertilizer after being diluted 200 to 250 times is 7.5-9.5.

Images