Soil conditioner prepared by combining low-molecular-weight organic acid with shiny-leaved yellowhorn shells and preparation method thereof

Abstract

The invention designs a soil conditioner combining low-molecular-weight organic acid with shiny-leaved yellowhorn shells and a preparation method of the soil conditioner. The specific method comprises the following steps: step S1, preparing low-molecular-weight organic acid fermentation liquor; s2, shiny-leaved yellowhorn shells are crushed to be 5-200 meshes; s3, mixing the shiny-leaved yellowhorn shell powder and the low-molecular-weight organic acid fermentation liquor according to the proportion of (5-20): 1 to form a primary mixture; step S4, mixing the preliminary mixture, peat and humic acid according to a ratio of 1: (0.1-0.5): (0.05-0.2) to form a middle-step mixture; and step S5, adding water and a binder into the intermediate mixture, and carrying out extrusion granulation to prepare the soil conditioner. The soil conditioner prepared by the method is applied to a plowing layer of the saline-alkali soil in manners of broadcasting, plowing and the like, so that the content of various quick-acting, medium-acting, long-acting and other organic matter components in the saline-alkali soil is increased, and the problems of high pH value, lack of organic matters and the like of the saline-alkali soil are solved.

Description

Technical Field

[0001] The invention belongs to the field of soil improvement, and particularly relates to a soil improver of low molecular weight organic acid combined with Xanthoceras sorbifolia husk and a preparation method thereof. Background Art

[0002] Salinized soil is widely distributed throughout the world, and the problem of soil salinization is a global problem. The area of ​​saline-alkali land in the world is about 950 million hectares, accounting for about 10% of the total land area. Saline-alkali land resources are important land resources in my country.

[0003] Soil salinization will lead to a decrease in soil fertility, difficulty in plant roots absorbing water, difficulty in crop growth or a significant reduction in yield or even abandonment of cultivation, which seriously affects the sustainable development of my country's agriculture and forestry. Therefore, in the current situation of shrinking cultivated land and severe shortage of land resources in my country, improving saline-alkali soil and comprehensively utilizing saline-alkali land has become an important national strategic task and urgent need.

[0004] Generally speaking, the main factors in improving saline-alkali soil include soil pH, salt content and groundwater level. There are several key issues that deserve attention in improving saline-alkali soil and planting crops on saline-alkali soil: ① soil organic matter deficiency, especially water-soluble organic matter; ② high degree of soil salinization, deterioration of soil physical and chemical properties, and serious abiotic stress on plants; ③ changes in the structure of soil microbial communities, which tend to be unbalanced and easily lead to soil-borne diseases.

[0005] In order to solve the problem of high pH value of saline-alkali soil, an organic-inorganic acidic soil conditioner disclosed in Chinese patent CN114907859A is composed of 85-95% water-soluble natural polymer complexing agent and 5-15% inorganic nutrient salt. The inorganic nutrient salt and the organic complexing agent can greatly improve the soil deacidification efficiency through cation exchange and complexation. 3+ It is converted into an organic complex form with lower toxicity, thereby alleviating the stress of aluminum toxicity on crops, and at the same time preventing aluminum ions from hydrolyzing more hydrogen ions, thereby significantly reducing soil exchangeable acid and increasing soil pH; due to the introduction of weak acid functional groups and basic cations, the soil organic carbon and cation exchange capacity are significantly increased, thereby increasing the soil acid-base buffer capacity and enhancing the soil's resistance to acidification. In the prior art, acidic soil conditioners with inorganic acids as the main raw materials are the main means. However, when using inorganic acids to improve alkaline soil, inorganic acids cannot increase soil organic matter, and the soil organic matter content is still at a low level.

[0006] Effective ways to increase soil organic matter include returning straw to the field and applying organic fertilizer. Regarding returning straw to the field, it is generally difficult to obtain a large amount of available straw for saline-alkali land that has not yet been reclaimed. And for large fields, it is often difficult to obtain sufficient organic fertilizer. Therefore, finding an organic matter that is easy to apply on saline-alkali land and can reduce the soil pH value has become an urgent need for saline-alkali land improvement. Summary of the invention

[0007] In order to solve the above problems, the present application designs a soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia shell and a preparation method thereof, so as to prepare a saline-alkali soil conditioner by mixing Xanthoceras sorbifolia shell powder, low molecular weight organic acid fermentation liquid, peat and humic acid to solve the problems of high pH value and lack of organic matter in saline-alkali soil.

[0008] Xanthoceras sorbifolia Bunge is a woody oil plant unique to my country. Due to its wide ecological adaptability, it is distributed or planted in 14 provinces (municipalities, autonomous regions) in northern my country. In the 21st century, after Xanthoceras sorbifolia Bunge was listed as a key bioenergy tree species for development in my country, the planned planting area in various provinces and regions has increased rapidly, and incomplete statistics have reached more than one million hectares.

[0009] What is harvested from Xanthoceras sorbifolia is the fruit, which consists of pericarp and seeds. The seeds include seed coat and kernel. By unit weight, the pericarp (also known as Xanthoceras sorbifolia shell) accounts for about 48% of the fruit, the seed coat about 25%, and the kernel about 27%. The oil content in the kernel is 55% to 65%, so it can be seen that oil only accounts for about 15% of the fruit harvest. According to this ratio, for every portion of Xanthoceras sorbifolia oil produced, more than 5 times the shell and seed coat and other residues will be produced. Xanthoceras sorbifolia shell and seed coat are porous structures with strong adsorption capacity. At the same time, Xanthoceras sorbifolia shell is also a potential resource of excellent organic matter. If the resource utilization problem of Xanthoceras sorbifolia processing residues cannot be solved as scheduled, it will not only cause a huge waste of raw material resources, but also bring huge pressure to the environment.

[0010] Low molecular weight organic acids are a class of organic compounds composed of three elements: carbon, hydrogen, and oxygen. They have a low molecular weight, usually less than 300 Daltons. Common low molecular weight organic acids include acetic acid, propionic acid, malonic acid, oxalic acid, acetic acid, tartaric acid, benzoic acid, citric acid, lactic acid, etc. These low molecular weight organic acids can release hydrogen ions through certain chemical reactions in the soil, reduce the soil pH, increase the soil organic matter and nutrient content, promote the growth and reproduction of soil microorganisms, and alleviate problems such as soil salinization and hardening. Low molecular weight organic acids can improve soil structure and increase soil porosity, thereby improving soil permeability and aeration, thereby promoting the release of nutrients such as inorganic phosphorus, iron, and zinc locked in the soil, and increasing the chances of plants absorbing these elements. In addition, low molecular weight organic acids can also improve soil texture, structure, and aeration through processes such as dissolving minerals and decomposing organic matter, thereby improving soil fertility and water use efficiency, thereby promoting crop growth. Low molecular weight organic acids can be used as a plant growth regulator to promote plant germination, growth, and disease resistance by providing the nutrients and water required by plants. At the same time, they can also promote photosynthesis and respiration, thereby improving the plant's light energy utilization and growth rate. In addition, low molecular weight organic acids can increase the sugar content, vitamin content and color brightness of fruits, increase crop yield and quality, and make crops more nutritious and marketable.

[0011] The decomposition of plant and animal residues produces organic acids, and plant roots also secrete organic acids. Another important way is the synthesis of organic acids by microorganisms. Most bacteria and fungi can secrete a variety of organic acids, and the strain type affects the number and type of secreted organic acids. Fungi mainly secrete organic acids such as oxalic acid, lactic acid, and malonic acid, while bacteria can secrete acetic acid and tartaric acid under certain conditions in addition to the above three organic acids. In addition, some mold microorganisms also produce sugar acids such as gluconic acid, glucuronic acid, and 2-ketogluconic acid. Furthermore, a few microorganisms can also produce some aromatic acids, such as ferulic acid, vanillic acid, syringic acid, and p-hydroxystyrene acid.

[0012] It can be seen that low molecular weight organic acids have many advantages in improving saline-alkali soils, but in the implementation process, they are difficult to fully play their role due to the lack of adsorption carriers and slow-release measures.

[0013] Therefore, the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia shell designed in the present application comprises Xanthoceras sorbifolia shell powder, low molecular weight organic acid fermentation liquid, peat, and humic acid;

[0014] The mass ratio of the Xanthoceras sorbifolia shell powder to the low molecular weight organic acid fermentation liquid is 5 to 20:1;

[0015] The mass ratio of the Xanthoceras sorbifolia shell powder to peat is 1:0.1-0.5;

[0016] The mass ratio of the Xanthoceras sorbifolia shell powder to humic acid is 1:0.05-0.2.

[0017] Preferably, the low molecular weight organic acid fermentation broth comprises acetic acid, propionic acid, malonic acid, oxalic acid, acetic acid and valeric acid.

[0018] Preferably, the pH value of the low molecular weight organic acid fermentation broth ranges from 0.1 to 3.0.

[0019] Preferably, the size of the Xanthoceras sorbifolia husk powder is 5 mesh to 200 mesh.

[0020] The preparation method of a soil conditioner of low molecular weight organic acid and Xanthoceras sorbifolia husk comprises the following steps:

[0021] Step S1, preparing low molecular weight organic acid fermentation broth;

[0022] Step S2, crushing the Xanthoceras sorbifolia shells into 5-200 meshes;

[0023] Step S3, mixing the Xanthoceras sorbifolia shell powder and the low molecular weight organic acid fermentation liquid in a ratio of 5 to 20:1 to form a preliminary mixture;

[0024] Step S4, mixing the preliminary mixture, peat and humic acid in a ratio of 1:0.1-0.5:0.05-0.2 to form a mid-step mixture;

[0025] Step S5: adding water and a binder to the mixture of the middle step, and making a soil conditioner by extrusion granulation.

[0026] Preferably, the method for preparing the low molecular weight organic acid fermentation broth comprises:

[0027] Step S11, placing the sugar substance in a mixed bacterial fermentation system of multiple strains for conversion to form a low molecular weight organic acid fermentation liquid;

[0028] In step S11, the method for preparing a mixed bacterial fermentation system of multiple strains includes:

[0029] Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens and lactic acid bacteria are used as fermentation strains, molasses, corn syrup, urea and trace elements are used as culture medium, the fermentation ventilation volume, that is, the ratio of the volume of compressed air introduced per minute to the volume of fermentation liquid is 1:0.2-0.6, the fermentation temperature is 28-32°C, and the fermentation time is 24-72 hours.

[0030] Step S12, ultrafiltration and reduced pressure distillation are performed on the low molecular weight organic acid fermentation broth to obtain a low molecular weight organic acid concentrate.

[0031] Preferably, the binder comprises diatomaceous earth.

[0032] Preferably, the pH value of the low molecular weight organic acid fermentation broth is less than 1, and the content of organic acid is greater than 30%.

[0033] Preferably, the application amount of the soil conditioner is 10 to 500 kg per mu each time, and the total number of applications of the soil conditioner during the crop growing season is 1 to 3 times.

[0034] The advantages and effects of this application are as follows:

[0035] 1. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia shell designed by the present application is formed by mixing Xanthoceras sorbifolia shell powder, low molecular weight organic acid fermentation liquid, peat, and humic acid, and applied to the saline-alkali land arable layer by broadcasting combined with tillage, etc. The application amount per mu each time is 10 to 500 kg, and the total number of applications of the soil conditioner during the crop growing season is 1 to 3 times. Through the above design, the present application can reduce the pH value of saline-alkali soil and increase the content of diversified organic matter in the soil, especially low molecular weight organic matter.

[0036] 2. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk designed in the present application uses Xanthoceras sorbifolia husk, which is the processing residue of Xanthoceras sorbifolia oil, and utilizes the Xanthoceras sorbifolia husk as a resource. On the one hand, it is used as an important source of supplementing soil organic matter, which can significantly increase soil organic matter. On the other hand, Xanthoceras sorbifolia husk, as an adsorptive carrier with strong adsorption capacity, can adsorb low molecular weight organic acids such as formic acid, acetic acid, valeric acid, and oxalic acid.

[0037] 3. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk designed in the present application uses low molecular weight organic acid, which can reduce the pH value of saline-alkali soil on the one hand, and provide a large amount of water-soluble organic carbon for saline-alkali soil on the other hand, thereby achieving efficient improvement of the pH value of alkaline soil and increasing the yield and quality of crops.

[0038] 4. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia shell designed in the present application is a mixture of low molecular weight organic acid, humic acid, peat and Xanthoceras sorbifolia shell, forming a diversified combination of small molecules, medium molecules, large molecules to super large molecules, forming a reasonable distribution of organic matter, and increasing the content of various organic matter components such as fast-acting, medium-acting and long-acting in saline-alkali soil.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0040] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0042] Figure 1 The present invention is a flow chart of a method for preparing a soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk. DETAILED DESCRIPTION

[0043] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0044] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0045] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0046] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0047] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0048] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0049] Example 1

[0050] The present application designs a soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk, including Xanthoceras sorbifolia husk powder, low molecular weight organic acid fermentation liquid, peat, and humic acid;

[0051] The mass ratio of the Xanthoceras sorbifolia shell powder to the low molecular weight organic acid fermentation liquid is 5 to 20:1;

[0052] The mass ratio of the Xanthoceras sorbifolia shell powder to peat is 1:0.1-0.5;

[0053] The mass ratio of the Xanthoceras sorbifolia shell powder to humic acid is 1:0.05-0.2.

[0054] These low molecular weight organic acids can release hydrogen ions through certain chemical reactions in the soil, reduce the soil pH, increase the soil organic matter and nutrient content, promote the growth and reproduction of soil microorganisms, and alleviate soil salinization, hardening and other problems. Low molecular weight organic acids can improve soil structure and increase soil porosity, thereby improving soil permeability and aeration, thereby promoting the release of inorganic phosphorus, iron, zinc and other nutrients locked in the soil, and increasing the opportunity for plants to absorb these elements. In addition, low molecular weight organic acids can also improve soil texture, structure and aeration through processes such as dissolving minerals and decomposing organic matter, improve soil fertility and water use efficiency, and thus promote crop growth. Low molecular weight organic acids can be used as a plant growth regulator to promote plant germination, growth and disease resistance by providing the nutrients and water required by plants. At the same time, they can also promote photosynthesis and respiration, thereby improving the utilization rate of light energy and growth rate of plants. In addition, low molecular weight organic acids can increase the sugar content, vitamin content and color brightness of fruits, increase crop yield and quality, and make crops more nutritious and marketable.

[0055] Peat is a natural swamp product formed over thousands of years, containing high organic matter, humic acid and nutrients, good ventilation performance, light weight, water retention, fertilizer retention, and conducive to microbial activity.

[0056] Humic acid is a macromolecular organic matter, a type of organic matter formed and accumulated by the decomposition and transformation of animal and plant remains, mainly plant remains, by microorganisms, as well as a series of geochemical processes. The molecular weight of humic acid ranges from 102 to 106 Daltons. Due to its widespread existence, it has a great impact on the earth, involving carbon cycle, mineral migration and accumulation, soil fertility, ecological balance and other aspects. The total amount of humic acid contained in the soil is the largest, but the average content in it is less than one percent. The basic structure of humic acid macromolecules is aromatic rings and alicyclic rings, with functional groups such as carboxyl, hydroxyl, carbonyl, quinone, and methoxy groups attached to the rings.

[0057] Furthermore, the low molecular weight organic acid fermentation broth includes acetic acid, propionic acid, malonic acid, oxalic acid, acetic acid and valeric acid.

[0058] Furthermore, the pH value of the low molecular weight organic acid fermentation broth ranges from 0.1 to 3.0.

[0059] Furthermore, the size of the Xanthoceras sorbifolia shell powder is 5 mesh to 200 mesh.

[0060] The main components of the Xanthoceras sorbifolia shell are ultra-large molecular cellulose and lignin, which are difficult to decompose in the short term. The advantage of this arrangement is that it provides long-lasting organic matter to loosen the saline-alkali soil and increase air permeability and water retention. Peat and humic acid are auxiliary ingredients that also play a role in improving the soil and promoting plant growth.

[0061] The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia shell designed by the present application is formed by mixing Xanthoceras sorbifolia shell powder, low molecular weight organic acid fermentation liquid, peat, and humic acid, and applied to the saline-alkali land arable layer by broadcasting, with an application amount of 10 to 500 kg per mu each time, and the total number of applications of the soil conditioner during the crop growing season is 1 to 3 times. Through the above design, the present application can reduce the pH value of saline-alkali soil and increase the content of diversified organic matter in the soil, especially low molecular weight organic matter.

[0062] Example 2

[0063] Please refer to Figure 1 Based on Example 1, the present application designs a method for preparing a soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk, comprising the following steps:

[0064] Step S1, preparing low molecular weight organic acid fermentation broth;

[0065] Step S2, crushing the Xanthoceras sorbifolia shells into 5-200 meshes;

[0066] Step S3, mixing the Xanthoceras sorbifolia shell powder and the low molecular weight organic acid fermentation liquid in a ratio of 5 to 20:1 to form a preliminary mixture;

[0067] Step S4, mixing the preliminary mixture, peat and humic acid in a ratio of 1:0.1-0.5:0.05-0.2 to form a mid-step mixture;

[0068] Step S5: adding water and a binder to the mixture of the middle step, and making a soil conditioner by extrusion granulation.

[0069] Furthermore, the method for preparing the low molecular weight organic acid fermentation broth comprises:

[0070] Step S11, placing the sugar substance in a mixed bacterial fermentation system of multiple strains for conversion to form a low molecular weight organic acid fermentation liquid;

[0071] In step S11, the method for preparing a mixed bacterial fermentation system of multiple strains includes:

[0072] Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens and lactic acid bacteria are used as fermentation strains, molasses, corn syrup, urea and trace elements are used as culture medium, the fermentation ventilation volume, that is, the ratio of the volume of compressed air introduced per minute to the volume of fermentation liquid is 1:0.2-0.6, the fermentation temperature is 28-32°C, and the fermentation time is 24-72 hours.

[0073] Step S12, ultrafiltration and reduced pressure distillation are performed on the low molecular weight organic acid fermentation broth to obtain a low molecular weight organic acid concentrate.

[0074] Furthermore, the dried Xanthoceras sorbifolia husk is processed by a shredder and a grinder to become a powder of 5 mesh to 100 mesh.

[0075] Furthermore, the binder includes diatomaceous earth.

[0076] Furthermore, the pH value of the low molecular weight organic acid fermentation broth is less than 1, and the content of organic acid is greater than 30%.

[0077] In this embodiment, the pH value of the low molecular weight organic acid concentrate is less than 1, and the content of organic acid is greater than 50%. The advantage of such a setting is that the acid-base neutralization effect is improved (the pH value of saline-alkali soil is reduced by 0.1-0.3), and the fast-acting component of alkaline soil - low molecular weight organic acid is greatly increased (the content of low molecular weight organic acid is increased from 540 μg / g in the control group to 1230 μg / g in the treatment group), thereby making the barren alkaline soil relatively fertile and rapidly improving the survival rate and biomass of the plants.

[0078] The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk designed in the present application uses Xanthoceras sorbifolia husk, which is the processing residue of Xanthoceras sorbifolia oil, and utilizes the Xanthoceras sorbifolia husk as a resource. On the one hand, it is used as an important source of supplementing soil organic matter, which can significantly increase soil organic matter; on the other hand, the Xanthoceras sorbifolia husk crop has an adsorption carrier with strong adsorption capacity, which can adsorb low molecular weight organic acids such as formic acid, acetic acid, valeric acid, and oxalic acid.

[0079] The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk designed in the present application uses low molecular weight organic acid, which can reduce the pH value of saline-alkali soil on the one hand, and provide a large amount of water-soluble organic carbon for saline-alkali soil on the other hand, thereby achieving efficient improvement of the pH value of alkaline soil and increasing the yield and quality of crops.

[0080] The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk designed in the present application is a mixture of low molecular weight organic acid, humic acid, peat and Xanthoceras sorbifolia husk, forming a diversified combination of small molecules, medium molecules, large molecules to super large molecules, forming a reasonable distribution of organic matter, and increasing the content of various organic matter components such as fast-acting, medium-acting and long-acting in saline-alkali soil.

[0081] Example 3

[0082] Based on Example 1 and Example 2, this example mainly introduces the first optimized design of a soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk.

[0083] After mixing the low molecular weight organic acid fermentation liquid with Xanthoceras sorbifolia shell powder in a ratio of 1:6, the "fermentation liquid + Xanthoceras sorbifolia shell powder mixture", peat and humic acid are mixed in a ratio of 1:0.2:0.1. According to the water content of the above materials, appropriate amount of water and binder (such as diatomaceous earth) are added, and a cylindrical or spherical granular saline-alkali soil conditioner is prepared by extrusion granulation.

[0084] In the test experiment, the pH value of saline-alkali soil was 7.7, and the application rate of soil conditioner was 100 kg per mu, which reduced the soil pH value by 0.1 (the pH value of the plant rhizosphere microenvironment decreased by 0.2-0.3), increased the soil organic matter from 6.8 g / Kg to 7.5 g / Kg, and increased the soil water-soluble organic matter from 442 μg / g to 701 μg / g.

[0085] Example 4

[0086] Based on Example 1 and Example 2, this example mainly introduces the second optimized design of the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk.

[0087] After mixing the low molecular weight organic acid fermentation liquid with Xanthoceras sorbifolia shell powder in a ratio of 1:10, the "fermentation liquid + Xanthoceras sorbifolia shell powder mixture", peat and humic acid are mixed in a ratio of 1:0.3:0.4. According to the water content of the above materials, appropriate amount of water and binder (such as diatomaceous earth) are added, and a cylindrical or spherical granular saline-alkali soil conditioner is prepared by extrusion granulation.

[0088] In Application Example 2, the pH value of the saline-alkali soil is 8.4, and the application rate of the soil conditioner per mu is 300 kg, which reduces the soil pH value by 0.3 (the pH value of the plant rhizosphere microenvironment decreases by 0.4-0.5), increases the soil organic matter from 5.2 g / Kg to 7.9 g / Kg, and increases the soil water-soluble organic matter from 365 μg / g to 927 μg / g.

[0089] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A soil conditioner comprising a low molecular weight organic acid and Xanthoceras sorbifolia husk, characterized in that: Including Xanthoceras sorbifolia shell powder, low molecular weight organic acid fermentation liquid, peat, humic acid; The mass ratio of the Xanthoceras sorbifolia shell powder to the low molecular weight organic acid fermentation liquid is 5 to 20:1; The mass ratio of the Xanthoceras sorbifolia shell powder to peat is 1:0.1-0.5; The mass ratio of the Xanthoceras sorbifolia shell powder to humic acid is 1:0.05-0.

2.

2. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 1, characterized in that: The low molecular weight organic acid fermentation broth comprises acetic acid, propionic acid, malonic acid, oxalic acid, acetic acid and valeric acid.

3. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to any one of claims 1 or 2, characterized in that: The pH value of the low molecular weight organic acid fermentation liquid ranges from 0.1 to 3.

0.

4. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to any one of claims 1 or 2, characterized in that: The size of the Xanthoceras sorbifolia shell powder is 5 mesh to 200 mesh.

5. The method for preparing the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step S1, preparing low molecular weight organic acid fermentation broth; Step S2, crushing the Xanthoceras sorbifolia shells into 5-200 meshes; Step S3, mixing the Xanthoceras sorbifolia shell powder and the low molecular weight organic acid fermentation liquid in a ratio of 5 to 20:1 to form a preliminary mixture; Step S4, mixing the preliminary mixture, peat and humic acid in a ratio of 1:0.1-0.5:0.05-0.2 to form a mid-step mixture; Step S5: adding water and a binder to the mixture in the middle step, and making a soil conditioner by extrusion granulation.

6. The method for preparing the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 5, characterized in that: The preparation method of the low molecular weight organic acid fermentation broth comprises: Step S11, placing the sugar substance in a mixed bacterial fermentation system of multiple strains for conversion to form a low molecular weight organic acid fermentation liquid; Step S12, ultrafiltration and reduced pressure distillation are performed on the low molecular weight organic acid fermentation broth to obtain a low molecular weight organic acid concentrated solution.

7. The method for preparing the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 5, characterized in that: The binder includes diatomaceous earth.

8. The method for preparing the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 5, characterized in that: The pH value of the low molecular weight organic acid fermentation broth is less than 1, and the content of the organic acid is greater than 30%.

9. The method for preparing the soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 6, characterized in that: In step S11, the preparation method of the multi-strain mixed bacterial fermentation system includes: Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens and lactic acid bacteria are used as fermentation strains, molasses, corn syrup, urea and trace elements are used as culture medium, the fermentation ventilation volume, that is, the ratio of the volume of compressed air introduced per minute to the volume of fermentation liquid is 1:0.2-0.6, the fermentation temperature is 28-32°C, and the fermentation time is 24-72 hours.

10. The soil conditioner of low molecular weight organic acid combined with Xanthoceras sorbifolia husk according to claim 1, characterized in that: The application amount of the soil conditioner is 10 to 500 kg per mu each time, and the total application times of the soil conditioner during the crop growing season is 1 to 3 times.

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