Method of preparing water-retain slow-release humic acid biological fertilizer through activation of brown coal humic acid

Abstract

The invention discloses a method of preparing a water-retain slow-release humic acid biological fertilizer through activation of brown coal humic acid. Dissolution of the humic acid is conducted through brown coal put in an alkaline condition, so that the specific surface area and the pore structure of the brown coal are increased; copolymerization of the humic acid and macromolecule organic under a certain condition is conducted to form a water-retain film with a rough surface, and a good water-absorbing quality, a water-retain quality after water-absorbing swelling and mechanical strength are provided; a center coating layer is formed through paraffin and polyisocyanate and used for providing water and nutrient diffusion with a physical barrier, and the speeds of the water diffusion into the fertilizer and nutrient diffusing out are reduced, so that according to the obtained coated fertilizer, slow and controlled releasing of the fertilizer are provided, and the use ratio of the fertilizer is improved. The coated fertilizer has the advantages that production technology is simple, the cost is low, large-scale production can be conducted, soil can be effectively improved, land is maintained while being used, crop nutrition is improved, all stress resistances are enhanced, and the yield and quality of crops are improved.

Description

technical field [0001] The invention relates to the technical field of organic fertilizers, in particular to a method for preparing humic acid biological fertilizer with water retention and slow release by activating lignite humic acid. Background technique [0002] Fertilizer and water are two major factors restricting the development of agricultural production. How to improve the utilization rate of water resources and fertilizer is crucial. One of the ways to improve fertilizer use efficiency is to use slow-release fertilizers. Commonly used slow-release fertilizers are coated fertilizers, that is, water-soluble fertilizers are coated with hydrophilic materials, and the fertilizers are released through the membrane. One of the ways to improve the utilization rate of water resources is to add super absorbents to the soil. Super absorbents are cross-linked hydrophilic polymers with a three-dimensional network structure, which can absorb a large amount of water in a short p...

AI Technical Summary

Problems solved by technology

Combining the water-absorbing and water-retaining properties of superabsorbents with the slow-release properties of slow-release fertilizers to prepare water-absorbing, water-retaining and slow-release fertilizers is a commonly used method at present. However, some problems have been encountered in the application of superabsorbents in agriculture. Pure Polyacrylate is expensive and not suitable for saline water and soil. Humic acid is a polymer compound that contains a large number of hydrophilic groups such as hydroxyl, carboxyl and sulfonic acid groups. In addition, humic acid can also improve Crop growth, promote the development of crop roots, increase the aggregate structure of the soil and improve the absorption of nutrients