Slow-release water-soluble fertilizer containing humic acid and preparation method thereof

Abstract

The invention relates to a controlled-release water-soluble fertilizer containing humic acid. The fertilizer comprises the raw materials by weight percent: 5-10% of humic acid, 15-20% of zinc sulfate, 20-25% of borax, 45-60% of magnesium sulfate, 0.2-2% of poly-aspartic acid, 0.5-2% of ethylenediamine tetraacetic acid disodium and 0.1-0.5% of caproic acid diethylamino alcohol ester. In the fertilizer, potassium humate is taken as a raw material, a little amount of poly-aspartic acid and ethylenediamine tetraacetic acid disodium are added into the raw material, so that three elements including Zn, B and Mg are complexed after being dissolved or in the dissolving process, and slowly released to the soil, and then absorbed by crops, thus the fertilizer nutrient is prevented from running off, and the absorption utilization rate of the nutrient substance can be improved; the product is convenient to use, and can be used as seed fertilizer or base fertilizer; the product can be instantly and completely dissolved, and is applied by flushing or spraying and drop irrigation; the controlled-release water-soluble fertilizer containing humic acid is the first choice for realizing efficient water-saving agriculture and integrating water and fertilizer. The controlled-release water-soluble fertilizer containing humic acid is especially suitable for supplementing trace elements such as Zn, B and Mg for commercial crops such as vegetables, seed production corns, oil crops, fruit trees and grapes which have high requirement for the fertilizer application level.

Description

technical field [0001] The invention relates to the field of fertilizer production, in particular to a slow-release water-soluble fertilizer containing humic acid, and also includes a preparation method of the water-soluble fertilizer. Background technique [0002] Scientific research shows that soil fertility depends largely on the content of humic acid in the soil, increasing soil humic acid can improve the soil. It can improve the physical structure of the soil, neutralize the acidity and alkalinity of the soil, and adjust the pH value; it can adsorb, exchange, and activate many mineral elements in the soil, such as nitrogen, phosphorus, potassium, calcium, zinc, boron, magnesium, etc., and chelate Insoluble metal cations are beneficial to the absorption and utilization of roots or leaves; keep water in the roots of crops, dissolve inorganic fertilizers and reduce their loss; reduce the reaction of phosphorus with calcium, iron, magnesium, aluminum, or convert them from i...

AI Technical Summary

Problems solved by technology

Commonly used zinc fertilizers, boron fertilizers or magnesium fertilizers have the following disadvantages: first, the nutrient elements are single; second, trace elements are easily fixed or lost in the soil, so that they cannot be well absorbed by crops, and the fertilizer utilization rate is poor; First, the efficacy and function are limited to supplementing nutrients or improving the soil. Fourth, the solubility is not guaranteed or the dissolution is incomplete, which is not conducive to spraying, drip irrigation, etc.