Nano controlled-release fertilizer and preparation method therefor

Abstract

The invention belongs to the technical field of production of controlled-release fertilizers and more specifically relates to a nano controlled-release fertilizer and a preparation method therefor. The nano controlled-release fertilizer is prepared from fertilizer core particles and external coatings, wherein the fertilizer core particles are mercapto functionalized nano-carriers for loading a fertilizer, and a mass ratio of the mercapto functionalized nano-carriers to the fertilizer is 1: (1 to 10). The nano controlled-release fertilizer provided by the invention is a nano-scale fertilizer and can be used for effectively increasing the absorption utilization ratio of crops to the fertilizer; after the nano-carriers for loading the fertilizer are subjected to functionalization treatment, the nano controlled-release fertilizer can have environment stimulated responsiveness, releases the fertilizer in the nano-carriers in case of stimulation and does not release the fertilizer in case ofno stimulation; and in the presence of glutathione or thioredoxin in crops, the glutathione or thioredoxin acts with disulfide bonds on surfaces of the nano-carriers, thus, the disulfide bonds are broken, and mesopores in surfaces of nanotubes and tube cavity ports are opened to release the fertilizer in tube cavities.

Description

technical field [0001] The invention belongs to the technical field of controlled release fertilizer production, and more particularly, the invention relates to a nanometer controlled release fertilizer and a preparation method thereof. Background technique [0002] Modern agricultural production largely relies on chemical fertilizers and pesticides to provide sufficient nutrients for crop growth, control various pests and diseases, and remove weeds to ensure healthy crop growth. However, the long-term large-scale application of agrochemical products has changed the soil structure, resulting in a significant reduction in the content of organic matter in the soil, resulting in the loss of farmland nutrients and a decline in soil fertility. Excessive application of chemical fertilizers brings many problems, mainly due to the low absorption and utilization rate of traditional agrochemical products by crops themselves. [0003] In recent years, the rapid development of nanotech...

AI Technical Summary

Problems solved by technology

The use of nanocarriers to adsorb, wrap and load traditional fertilizers is an effective way to manufacture new slow-release nanofertilizers, which can effectively protect fertilizers from degradation caused by light, high temperature and microbial infection. The loaded fertilizer can be released slowly, so as to achieve the effect of prolonging the fertilizer effect, but it is difficult to guarantee the fertilizer loading rate by simple adsorption, especially in the pretreatment process, it is easy to be washed away by water

In addition, the processing technology of nano-fertilizers, especially nano-slow and controlled-release fertilizers, is immature and stable, and the mode and mechanism of the controlled release of nano-slow and controlled-release fertilizers in crops are still unclear, which seriously restricts the further development of nano-slow and controlled-release fertilizers. development and widespread use

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