Long-acting modified sustained-release fertilizer coated by urea-formaldehyde resin

Abstract

The invention relates to the field of composite fertilizers, and concretely relates to a long-acting modified sustained-release fertilizer coated by urea-formaldehyde resin. The fertilizer is prepared from the following raw materials in parts by weight: 10-15 parts of 1250-2000 mesh diatomite, 10-12 parts of ammonium phosphate, 12-15 parts of ammonium bicarbonate, 8-10 parts of calcium superphosphate, 6-8 parts of flaxseed meal powder, 4-6 parts of cobs, 8-10 parts of rapeseed meal, 4-5 parts of traditional Chinese medicine residue, 2-4 parts of bamboo shreds, 3-5 parts of agarose, 1-3 parts of tris(hydroxymethyl)aminomethane, 2-4 parts of disodium ethylene diamine tetraacetate, 12-15 parts of urea-formaldehyde resin emulsion, 1-2 parts of disproportionated potassium rosinate, 0.2-0.3 part of sodium dodecanesulphonate, 2-3 parts of polyamide, 1-2 parts of potassium iodate, 3-4 parts of tricalcium phosphate, 2-3 parts of zinc gluconate and 4-5 parts of an auxiliary agent. The composite fertilizer is abundant in raw material kinds and comprehensive and rich in nutrients, contains abundant organics, and is capable of improving soil environment. Dual cladding on nutrients is formed by utilizing diatomite and a sustained-release agent in the production technology, the fertility is durable and stable in release, and the quality and the output of crops are effectively improved.

Description

technical field [0001] The invention relates to the field of compound fertilizers, in particular to a long-acting modified urea-formaldehyde resin-coated slow-release compound fertilizer. Background technique [0002] In modern agricultural production, compound fertilizer can be seen everywhere. It has the advantages of high nutrient content, less auxiliary components, high fertilizer utilization rate, and convenient storage and application. It plays an important role in promoting high and stable crop yields. Slow-release compound fertilizer is an important category of compound fertilizers, and it is also the focus of research on the development of my country's chemical fertilizer industry. Its slow-release principle is to coat a thin layer of hydrophobic substances on the surface of fertilizer particles, so that the internal nutrients are slowly released to the In the soil, nutrients are continuously supplied to crops, which effectively improves the utilization rate of ferti...

AI Technical Summary

Problems solved by technology

However, the existing slow-release compound fertilizers still have certain shortcomings, mainly in that the nutrient ratio is relatively fixed, and it is difficult to meet the different needs of various soils and various crops; the slow-release effect is not satisfactory, and does not match the growth needs of crops , thereby reducing fertilizer efficiency, affecting crop growth, resulting in reduced production and income