Fertilizer of chelated zinc, and preparation method

Abstract

This invention relates to a chelated zinc fertilizer, which is prepared from: catalyst 1-2 wt. %, inorganic zinc raw material 58-69 wt. %, and chelating agent 30-40 wt. %. The chelating agent is composed of: oxalic acid 5-10 wt.%, malic acid 8-20 wt.%, citric acid 15-25 wt.%, maleic acid 10-25 wt.%, sorbitol 3-8 wt.%, gallic acid 8-10 wt.%, and lactic acid 2-8 wt.%. The catalyst is composed of: gadolinium chloride 0.1-0.35 wt.%, selenium dioxide 0.1-0.2 wt.%, chalcanthite 0.05-0.1 wt.%, KOH 0.05-0.1 wt.%, potash 0.1-0.2 wt.%, and palladium carbonate 0.05-0.2 wt.%. The chelating agent has appropriate stability and low cost, and can chelate with zinc in solid state. This invention also relates to a method for preparing the chelated zinc fertilizer, which specifies the process parameters, and appropriate catalyst and reaction conditions.

Description

technical field [0001] The invention relates to the field of chemical fertilizers in agricultural science and technology, in particular to a chelated zinc fertilizer and a preparation method thereof. Background technique [0002] Whether it is the calcareous soil in the north or the acidic soil in the south, there is a large area of ​​zinc deficiency, and the crops sensitive to zinc are more extensive. In addition to fruit trees and vegetables, gramineous crops are also very sensitive to zinc. Among them, rice and Corn is the most sensitive, and gramineous crops are the most important crops in agricultural production, so it is particularly important to solve the problem of zinc deficiency. [0003] The way to solve zinc deficiency in crops is to apply zinc fertilizer to soil or foliage. The most commonly used traditional zinc fertilizer is zinc sulfate. The application of zinc sulfate is different from iron and calcium, and generally has a better effect, but it still cannot...

AI Technical Summary

Problems solved by technology

[0004] Traditionally used chelated zinc includes EDTA-Zn, zinc citrate and amino acid zinc. In addition to being expensive, EDTA-Zn and zinc citrate also have adverse effects on plants caused by EDTA

Although the amino acid zinc will not have adverse effects on plants, the stability constant of the amino acid zinc is too low to prevent the hydrolysis and inactivation of zinc in plants by reacting with some anions