Preparation method of biological compound slow-release fertilizer

Abstract

The invention discloses a preparation method of a biological compound slow-release fertilizer. The preparation method comprises the following steps: a) mixing bone glue, soybean phospholipids, soybean oil, soybean meal and iso-octyl palmitate, and then carrying out ultrasonic dispersion; b) uniformly coating a mixed solution on the surface of a fertilizer master batch A by using a way of vacuum spraying, then drying and cooling to room temperature to obtain fertilizer granules; c) taking a fertilizer master batch B and gelatinized starch to be mixed with the fertilizer granules, thus preparing compound fertilizer granules; d) taking starch sodium octenyl succinate and a potassium carbonate solution, mixing and stirring into paste, then adding to the compound fertilizer granules, stirring, drying and cooling to the room temperature to obtain the biological compound slow-release fertilizer. The preparation method disclosed by the invention is suitable for preparing the water-soluble slow-release fertilizer, and the material of a coating layer is a degradable material, so as to have no pollution to soil, furthermore, the preparation method is simple in process, convenient to operate and short in technical process cycle, and does not produce waste, so as to be in line with the concept of greenness and environmental protection of the atomic economy, and conducive to industrialized popularization and application.

Description

technical field [0001] The invention relates to the technical field of fertilizer production, in particular to a preparation method of biological compound slow-release chemical fertilizer. Background technique [0002] Chemical fertilizers play a pivotal role in agricultural production. As a large agricultural country, my country has a high demand for chemical fertilizers in agricultural production. According to statistics, chemical fertilizers have become the largest material investment in agricultural production, accounting for about 50% of all productive expenditures. The production and usage of chemical fertilizers in my country ranks first in the world, and the output accounts for about 20% of the world's chemical fertilizer production, and the usage has accounted for 28% of the world's chemical fertilizer consumption; however, due to the nature of chemical fertilizers and the requirements for the soil environment, resulting The physical properties of soil continue to d...

AI Technical Summary

Problems solved by technology

[0003] Slow-release chemical fertilizers have the following advantages: 1) reduce nutrient loss and improve fertilizer utilization, 2) reduce chemical and biological fixation in the soil that causes plants to be unusable, 3) reduce denitrification and nitrogen nitrification Nitrogen loss; however, the existing slow-release fertilizers have the following problems: 1) The film-forming materials of the coating layer are mostly synthetic polymers, which are not easy to biodegrade; 2) Direct use of pure starch or various plant straw powders plus chemical bonding The sustained release period is short or the sustained release rate is difficult to control; 3) The coating materials used are expensive, such as coupling agents such as silane, titanate or aluminate, and the high cost is not conducive to large-scale application