Coated slow-release organic fertilizer and preparation method thereof

Abstract

The invention provides a coated slow-release organic fertilizer and a preparation method thereof, and relates to the field of fertilizers. The organic fertilizer is composed of a urea core body with the particle size of 1-5 mm and a coating film. The coating film is composed of a slow-release layer on the inner side and an isolation layer on the outer side. The slow release layer comprises 60-90%of carbon-based loaded layered double hydroxides according to the total mass; the isolation layer is made of a styrene-acrylic emulsion-paraffin-phosphogypsum material; tests show that the slow-release performance of a fertilizer without the isolation layer is greatly reduced after stirring and mixing and the fertilizer efficiency is completely released after 16 days, while the slow-release performance of the fertilizer containing the isolation layer is not influenced by stirring and mixing, so that the isolation layer can well protect the fertilizer, and the influence of collision and abrasion on the slow-release performance of the fertilizer is avoided.

Description

technical field

[0001] The invention relates to the field of fertilizers, in particular to a coated slow-release organic fertilizer and a preparation method thereof. Background technique

[0002] N, P, and K in fertilizers are the three main nutrient elements necessary for crop growth and development. However, due to the soluble characteristics of today's commercial fertilizers, the release rate of N, P, and K nutrients per unit time is much greater than the absorption rate of crops. It has caused problems such as low crop nutrient utilization rate, crop quality and yield decline, waste of resources, and environmental pollution. For example, proper supply of N nutrients can promote plant growth and increase yield, but excessive and inappropriate N supply can cause nitrate accumulation in crops, which is harmful to human health. Generally, cereals and vegetable crops can only absorb about 33% of the total amount of N in fertilizers. Even the more common urea N fertilizers ha...

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