A kind of ph-sensitive coated slow-release phosphate fertilizer and preparation method thereof

Abstract

The present invention provides a pH -sensitive capsule phosphate fertilizer and its preparation method. This slowdown -release phosphate fertilizer is to spray the phosphorus fertilizer and phosphorus alfonic agent particles evenly sprayed evenly on the phosphate fertilizer particles surface leather capsules with a PH sensitive properties.The present invention can secrete organic acids in large quantities when the crop is deficient in phosphorus, causing a lower pH around the root system. The slow -release phosphate fertilizer can be swelled in large quantities according to the reduction of the pH value, thereby releasing the phosphorus in large quantities.The present invention can release phosphorus in a targeted control of phosphorus according to different stages of plant growth. It can supplement the phosphorus to the plant in a timely and appropriate amount, which can solve the problem that the current mitter -release fertilizer cannot synchronize with the growth of crops.

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 concentrati...

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 effective utilization rate of phosphorus cannot be significantly improved.

After the film layer of ordinary coated phosphate fertilizer dissolves or degrades over time, a large amount of phosphate fertilizer is released, and the absorption of crops is slow, which easily causes phosphate fertilizer to be fixed by the soil and reduces the utilization rate of phosphate fertilizer; chemically synthesized phosphate fertilizer is still slowly dissolved over time , slow release of phosphate fertilizer, cannot supply according to the demand of crops for phosphate fertilizer

At present, although fertilizers suitable for saline-alkali land have been developed, the main purpose is to add acid-base substances to adjust the pH of the soil. However, the change of soil pH has certain fluctuations, and the absorption of phosphate fertilizer by crops is closely related to the pH.