A modified humic acid chelated water soluble fertilizer and a preparing method thereof

Abstract

The invention relates to a modified humic acid chelated water soluble fertilizer. Humic acid can be polymerized and modified by utilizing a polymerizable monomer compound to allow the humic acid to be dispersed in water in a microsphere manner, thus overcoming the water solubility problem of the humic acid on the one hand and improving chelating performance on the other hand. After the humic acid is chelated with ions in conventional nitrogen phosphorus potassium fertilizers and trace element fertilizers, the chelation products can be well dispersed in water, thus promoting absorption and utilization of elements by crops. Through chelation with trace mineral element cations, formation of noneffective precipitates from the ions and PO<4><3-> and SO<4><2-> can be avoided. A preparing method of the chelated water soluble fertilizer is also provided. The method includes steps of subjecting the humic acid to polymerization modification with the polymerizable monomer compound to obtain a humic acid microsphere suspension, and then subjecting the suspension, nitrogen phosphorus potassium fertilizers and trace elements such as calcium, zinc, boron and magnesium to mechanical grinding and dispersing under waterless conditions to obtain the modified humic acid chelated water soluble fertilizer.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, in particular to a water-soluble fertilizer containing humic acid and a preparation method thereof, in particular to a water-soluble fertilizer containing polymer-modified humic acid and a preparation method thereof. Background technique [0002] Humic acid, also known as humic acid (HA for short), is the remains of animals and plants, mainly the remains of plants, a type of organic substance caused and accumulated by a series of processes of microbial decomposition and transformation, as well as geochemistry. Humic acid is a mixture of a group of amorphous acidic substances with aromatic structures and similar properties, including black humic acid, fulvic acid and brown humic acid. Humic acid can improve the soil, 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 min...

AI Technical Summary

Problems solved by technology

The implementation of this technical solution requires high-priced potassium hydroxide, which has a certain destructive effect on the environment; at the same time, its components lack various trace elements necessary for plants, which is unfavorable to the growth of crops

[0005] Chinese invention patent application number 201310357167.9 discloses a water-soluble fertilizer containing high concentration of humic acid. , hydroxymethyl cellulose, and water are the formula, which also has the defect of insufficient nutritional elements, especially the lack of trace elements necessary for various plants, so it is not conducive to the growth of crops

[0006] China Invention Patent Application No. 201510003070.7 discloses a high-concentration humic acid water-soluble fertilizer. In order to solve the technical problem that the anti-flocculation performance and activity of humic acid in most humic acid water-soluble fertilizers are not ideal at present, it adopts high activity Potassium humate and potassium tripolyphosphate are the main raw materials, and the anti-flocculation performance and activity of humic acid are improved

However, the high-activity potassium humate described in this technical proposal needs to be extracted from high-activity young lignite as a raw material, so its promotion will be restricted by the narrow supply of raw materials

[0007] According to the above, because humic acid is easy to flocculate with trace elements, and then forms ineffective precipitation, which affects the absorption and utilization of trace elements by crops, resulting in a great waste of resources. Therefore, currently humic acid water-soluble fertilizers are used to add nitrogen and phosphorus , potassium and other main nutritional elements; through the selection of raw materials, high-activity humic acid can be obtained, which can improve the activity and anti-flocculation performance of humic acid to a certain extent, and promote the absorption of trace elements by crops. It is suitable for specific production raw materials, so it is difficult to carry out large-scale promotion and application