Polymorphic controlled-release fertilizer and preparation method thereof

Abstract

The invention discloses a multi-form controlled-release fertilizer and relates to the technical field of agricultural fertilizers. It uses 10-70 parts of urea, 5-30 parts of ammonium nitrate, 1-15 parts of formaldehyde, 0-20 parts of ammonium sulfate, 10-50 parts of potassium sulfate, 5-50 parts of monoammonium phosphate, and 1-15 parts of medium and micro fertilizers. Parts are used as raw materials, and multi-form controlled-release fertilizers are obtained by mixing, granulating, and cooling. The multi-form controlled-release fertilizer of the present invention has the advantages of achieving controlled release and synergizing efficiency, complementing multiple nutrients, improving nitrogen fertilizer utilization rate, being completely degraded, and being green and pollution-free.

Description

technical field [0001] The invention relates to the technical field of agricultural fertilizers, in particular to a multi-morphic controlled-release fertilizer. Background technique [0002] The Food and Agriculture Organization of the United Nations (FAO) and authoritative agricultural experts believe that the contribution of chemical fertilizers accounts for about 40% to 50% of the factors that increase crop production. The application of chemical fertilizers has laid a material foundation for the production and development of modern agriculture and the protection of human food security. However, the low utilization rate of chemical fertilizers and the resulting high environmental risks have always been a major problem plaguing the world. Therefore, countries all over the world are actively exploring methods and approaches to improve fertilizer utilization and curb environmental pollution. Among them, slow / controlled release fertilizer is an environmentally friendly fertil...

AI Technical Summary

Problems solved by technology

Slow / controlled release fertilizers have beneficial effects such as reducing nutrient loss, increasing fertilizer use efficiency, improving soil structure, increasing yield, and improving crop quality. However, the current special slow-release fertilizers have only one nitrogen release peak, which is not suitable for different growth of crops. The growth demand in the vigorous period is likely to cause the problems of low fertilizer utilization rate and slow increase of crop yield

Some manufacturers use thermoplastic resin-coated urea, thermosetting resin-coated urea, sulfur-coated urea, potassium fertilizer, and phosphate fertilizer to form controlled-release fertilizers, which already have multiple fertilizer release peaks; , temperature, and soil quality are greatly affected, and it is difficult to control the peak release point of fertilizer, and the controlled release film cannot be completely degraded, which is easy to cause pollution to the soil

[0004] Therefore, the existing slow and controlled-release fertilizers generally have defects such as heavy non-point source pollution and incomplete degradation of the controlled-release film; crop controlled-release fertilizers are greatly affected by soil humidity, temperature, and soil quality, and the expected release target is poor.

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