Saline-alkali soil granular structure fast-forming colloidal granule and preparation method and application thereof

Abstract

The invention provides a saline-alkali soil granular structure rapid colloidal granule as well as a preparation method and application thereof. The preparation method comprises the following steps: proportioning raw materials: adding 5kg of sodium hydroxide (caustic soda), 1kg of sodium tetraborate and 1.5 kg of potassium carbonate into 1kg of water; the preparation method of the modified sesbania gum (guar gum, locust bean gum and other vegetable gum) comprises the following steps: uniformly stirring the raw materials according to the ratio to form an instantizer, and then adding 10% of the instantizer into the high-viscosity sesbania gum raw material for modification. After modification, a proper amount of beta-mannase is added for enzymatic treatment, so that the viscosity of the sesbania gum is reduced; and forming granules: mixing the sesbania gum solution subjected to enzyme digestion with a proper amount of adhesive (such as polyacrylamide) and filler (such as sesbania bean powder), granulating at low temperature, and screening to obtain the granules. A sodium carboxymethyl cellulose solution is sprayed on the surfaces of the granules, so that the stability and the slow-release effect of the granules are improved.

Description

Technical Field

[0001] The invention relates to the technical field of soil improvement, and in particular to a quick-forming colloidal granular agent with a granular structure for saline-alkali land, and a preparation method and application thereof. Background Art

[0002] Saline-alkali land is a typical low-yield soil with poor soil structure, poor aeration, strong water evaporation and high soil solution concentration, which is extremely unfavorable for crop growth. At present, there are various methods for improving saline-alkali land, but there are problems such as high cost, slow effect and easy recurrence. Therefore, it is of great significance to develop an efficient, fast and long-lasting saline-alkali land improvement technology. Summary of the invention

[0003] The purpose of the present invention is to provide a colloidal granule with a quick-forming granular structure in saline-alkali land and a preparation method and application thereof. The granule can quickly improve the soil structure of saline-alkali land, increase soil fertility and promote the growth of crops.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions: 1. The method for preparing the quick-forming colloidal granules with a granular structure for saline-alkali land comprises the following steps: (1) Raw material ratio: add 5 kg of sodium hydroxide (caustic soda), 1 kg of sodium tetraborate, and 1.5 kg of potassium carbonate to 1 kg of water; (2) Preparation of modified sesbania gum (guar gum, locust bean gum and other plant gums): The raw materials in the above ratio are stirred evenly to become a quick dissolving agent, and then added to the high-viscosity sesbania gum raw material at a dosage of 10% for modification. After modification, an appropriate amount of β-mannanase is added for enzymatic treatment to reduce the viscosity of the sesbania gum; (3) Formation of granules: The enzymatic sesbania gum solution is mixed with an appropriate amount of a binder (such as polyacrylamide) and a filler (such as sesbania bean powder), and granulated and sieved at low temperature to obtain granules. Sodium carboxymethyl cellulose solution is sprayed on the surface of the granules to improve the stability and sustained release effect of the granules.

[0005] 2. Application of quick-forming colloidal granules with aggregate structure in saline-alkali land (1) Ploughing the soil: Ploughing the saline-alkali land to a depth of 15-20 cm to ensure that the soil is loose; (2) Applying granules: Apply the prepared granules evenly to the tilled soil. The application amount per mu is determined according to the soil salinity and improvement requirements, generally 0.2-0.6 tons; (3) Irrigation water treatment: Add an appropriate amount of glacial acetic acid to the irrigation water to make the sesbania gum in the granules quickly form a paste in the soil, promoting the agglomeration of soil particles into a granular structure.

[0006] Due to the adoption of the above technical solution, the advantages and positive effects of the present invention are: 1. Principle of chemical modification The addition of sodium hydroxide, sodium tetraborate and potassium carbonate can change the molecular structure of sesbania gum and improve its solubility and reactivity. The enzymatic treatment of β-mannanase further reduces the viscosity of sesbania gum, making it easier to mix and react with other substances.

[0007] 2. Soil improvement principle The paste-like substance in the quick-forming colloidal granules of saline-alkali land aggregate structure has good cohesiveness and stability, and can quickly condense soil particles into aggregate structures. The formation of this aggregate structure improves the air permeability and water permeability of the soil, increases the porosity and air permeability of the soil, is conducive to the activity of microorganisms in the soil and the transformation of nutrients, thereby improving soil fertility.

[0008] 3. Innovation in raw material combination The present invention combines sodium hydroxide, sodium tetraborate, potassium carbonate and sesbania gum for the first time, and prepares granules with quick solubility and adhesion through chemical modification and enzymatic treatment. This unique raw material combination and treatment method provides a new idea for the improvement of saline-alkali land.

[0009] 4. Innovative application method: Apply the granules into the soil, then add glacial acetic acid through irrigation water, step by step, easy to operate, and effective. The slow-release effect of the granules can prolong the improvement effect and reduce the frequency and cost of repeated application. DETAILED DESCRIPTION Example

[0011] 1. Raw material preparation: weigh 50 kg water, 5 kg sodium hydroxide, 1 kg sodium tetraborate, 1.5 kg potassium carbonate and 5 kg high viscosity sesbania gum.

[0012] 2. Preparation of quick dissolving agent: Add sodium hydroxide, sodium tetraborate and potassium carbonate into water and stir well to form a quick dissolving agent.

[0013] 3. Modification of sesbania gum: Add 10% of the quick dissolving agent to sesbania gum and stir evenly. Then add an appropriate amount of β-mannanase for enzymatic treatment to reduce the viscosity of sesbania gum.

[0014] 4. Granule formation: The enzymatic sesbania gum solution is mixed with an appropriate amount of polyacrylamide and sesbania bean powder, and granulated and sieved at low temperature to obtain granules. Sodium carboxymethyl cellulose solution is sprayed on the surface of the granules to improve the stability and sustained release effect of the granules.

[0015] 5. Application method: (1) Ploughing the soil: Plough the saline-alkali land to a depth of 15-20 cm.

[0016] (2) Applying granules: Apply the prepared granules evenly into the tilled soil at a rate of 0.4 tons per mu.

[0017] (3) Irrigation water treatment: Add an appropriate amount of glacial acetic acid to the irrigation water to make the sesbania gum in the granules quickly form a paste in the soil, promoting the agglomeration of soil particles into a granular structure.

[0018] 6. Effect evaluation: After a period of natural action, the soil structure has been significantly improved, the soil's air permeability and water permeability have been significantly improved, and the growth of crops has been significantly improved.

[0019] The saline-alkali land aggregate structure quick-forming colloidal granules of the present invention and the preparation method and application thereof are scientific, innovative and practical. Through a unique combination of raw materials and a processing method, the soil structure of saline-alkali land can be quickly and effectively improved, soil fertility can be increased, and crop growth can be promoted, thus providing a new technical approach for the development and utilization of saline-alkali land.

Claims

1. A method for preparing a quick-forming colloidal granule with a saline-alkali land aggregate structure, characterized in that: The following steps are involved: (1) Raw material ratio: add 5 kg of sodium hydroxide (caustic soda), 1 kg of sodium tetraborate, and 1.5 kg of potassium carbonate to 50 kg of water; (2) Preparation of modified sesbania gum: The raw materials in the above proportions are stirred evenly to form a quick dissolving agent, and then added to a high-viscosity sesbania gum raw material at a dosage of 10% for modification. After modification, an appropriate amount of β-mannanase is added for enzymatic treatment to reduce the viscosity of the sesbania gum; (3) Formation of granules: The enzymatic sesbania gum solution is mixed with an appropriate amount of a binder (such as polyacrylamide) and a filler (such as sesbania bean powder), and granules are obtained by low-temperature granulation and screening. The surface of the granules is sprayed with sodium carboxymethyl cellulose solution to improve the stability and sustained-release effect of the granules.

2. The preparation method according to claim 1, characterized in that: The adhesive is polyacrylamide, and the filler is sesbania bean powder.

3. A quick-forming colloidal granule with a granular structure for saline-alkali land, characterized in that: Prepared by the preparation method described in claim 1.

4. An application method of a quick-forming colloidal granule with a granular structure for saline-alkali land, characterized in that: The following steps are involved: (1) Ploughing the soil: Plough the saline-alkali land to a depth of 15-20 cm; (2) Applying granules: Apply the prepared granules evenly to the tilled soil at a rate of 0.2-0.6 tons per mu; (3) Irrigation water treatment: Add an appropriate amount of glacial acetic acid to the irrigation water to allow the sesbania gum in the granules to quickly form a paste in the soil, thereby promoting the agglomeration of soil particles into a granular structure.

5. The application method according to claim 4, characterized in that: The application amount per mu is 0.4 tons.

6. A quick-forming colloidal granule with a granular structure for saline-alkali land, characterized in that: The granules include the following components: (1) Sesbania gum: 5 kg; (2) Rapid dissolving agent: composed of 50 kg water, 5 kg sodium hydroxide, 1 kg sodium tetraborate, and 1.5 kg potassium carbonate; (3) Adhesive: polyacrylamide; (4) Filler: sesbania bean powder; (5) Stabilizer: sodium carboxymethyl cellulose.

7. The granules according to claim 6, characterized in that The quick dissolving agent is added to sesbania gum in an amount of 10% for modification, and after modification, an appropriate amount of β-mannanase is added for enzymatic treatment.

8. A method for preparing a quick-forming colloidal granule with a granular structure for saline-alkali land, characterized in that: The following steps are involved: (1) Add 50 kg of water, 5 kg of sodium hydroxide, 1 kg of sodium tetraborate, and 1.5 kg of potassium carbonate into a stirring device and stir well to form a quick dissolving agent; (2) adding 10% by weight of the quick dissolving agent prepared in step (1) to 50 kg of high-viscosity sesbania gum raw material, and continuing to stir evenly to allow the sesbania gum to fully absorb the quick dissolving agent; (3) adding an appropriate amount of β-mannanase to the sesbania gum solution mixed in step (2) for enzymatic treatment, stirring evenly and then standing for a period of time to reduce the viscosity of the sesbania gum; (4) mixing the sesbania gum solution after the enzymatic treatment in step (3) with an appropriate amount of polyacrylamide adhesive and sesbania bean powder filler, and granulating the mixture using a low-temperature granulation device to obtain preliminary granules; (5) screening the preliminary granules prepared in step (4) to select granules that meet the particle size requirements; (6) Spraying the surface of the granules screened out in step (5) with a sodium carboxymethyl cellulose solution to further improve the stability and sustained-release effect of the granules, thereby obtaining the final saline-alkali land aggregate structure rapid colloidal granules.