pH-sensitive coated slow-release phosphate fertilizer and preparation method thereof

Abstract

The invention provides pH-sensitive coated slow-release phosphate fertilizer and a preparation method thereof. The pH-sensitive coated slow-release phosphate fertilizer is prepared by uniformly spraying a coating layer having pH sensibility on surfaces of phosphate fertilizer-phosphate solubilizing microbial inoculum mixture particles. Crops lack of phosphor secretes a large amount of organic acid so that a pH value around the roots is reduced, and aiming at solving the above mechanism, the pH-sensitive coated slow-release phosphate fertilizer can greatly swell according to pH value decreasing so that a large amount of phosphor is released. The pH-sensitive coated slow-release phosphate fertilizer can control release of phosphor according to different phosphor requirement amounts of crops in different growth stages, can timely supply an appropriate amount of phosphor for plants and solves the problem of mismatching of a fertilizer release amount of the existing slow-release fertilizer and crop growth requirements in different stages.

Description

technical field [0001] The invention relates to the field of phosphate fertilizers, in particular to a pH-sensitive coated slow-release phosphate fertilizer and a preparation method thereof. Background technique [0002] Phosphorus is one of the essential nutrients for the growth of crops. The crops have a certain demand for phosphorus throughout the growth cycle. However, after the phosphorus fertilizer is applied to the soil, only a small amount can be absorbed by the crops, while the rest has not been absorbed by the crops. Utilization is lost in vain due to leaching or being fixed by metal ions, resulting in loss of phosphate fertilizer. Develop and apply slow-release phosphate fertilizers to prolong the release time of phosphate fertilizers, so that phosphate fertilizers can gradually provide phosphorus to crops during the slow dissolution process, and prevent adverse consequences such as damage to crop seeds, seedlings or burnt leaves due to excessive local concentrat...

AI Technical Summary

Problems solved by technology

The coated phosphate fertilizer obtained by the invention has a slow release in the early stage, but the release of the phosphate fertilizer is difficult to control after the film layer is broken in the later stage, which is easy to cause waste and loss of phosphate fertilizer

[0006] Chinese Patent Publication No. CN103819278A discloses a high-strength urea-formaldehyde slow-release fertilizer and its preparation method. The slow-release fertilizer is synthesized by combining urea-formaldehyde and phosphate fertilizer, and releases phosphorus through the slow decomposition of chemically synthesized substances. Dissolution, in the process of releasing phosphorus from phosphate fertilizer, the release cycle cannot be guaranteed to be synchronized with the plant growth cycle. Although the purpose of slow release of phosphate fertilizer can be achieved, the effe