Double-coated slow-release water-retention urea fertilizer and preparation method thereof

Abstract

The invention provides a double-coated slow-release water-retention urea fertilizer, which is composed of a fertilizer inner core, an inner-layer coating film, a binder and an outer-layer coating film, wherein the fertilizer inner core is composed of talcum powder, urea, citrus peel, tea leaves and a slow-release additive, the inner-layer coating film is composed of sodium alginate and chitosan, the binder is composed of treated bletilla striata gum and polyethylene glycol, and the outer-layer coating film is composed of a water-retaining agent. Compared with the prior art, (1) the slow release performance of the fertilizer core urea is ensured, and the 90-day release rate is not higher than 70%, preferably not higher than 65%, and the 180-day release rate is 80-90%; (2) the slow release property of the fertilizer can be further adjusted, the soil moisture can be maintained, and the soil moisture capacity in 30 days is not lower than 30%, preferably not lower than 40%, and more preferably not lower than 50%; and (3) the quality is stable, and the slow release performance and the water retention performance are kept unchanged after the fertilizer is placed at normal temperature for 12 months.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a double-coated slow-release water-retaining urea fertilizer and a preparation method thereof. Background technique [0002] Agriculture is the foundation of the national economy. Under the pressure of this current situation, it is necessary to accelerate the development of modern agriculture characterized by low input, high output, high efficiency and sustainable development. Among them, fertilizer industry and water resource utilization are the quality basis of traditional Chinese medicine for modern agricultural production and development. [0003] my country's water resources are relatively poor and unevenly distributed. At the same time, water waste is very large. Taking agriculture as an example, the utilization rate of irrigation water is only about 40%. my country is also a large agricultural country, and agricultural water consumption account...

AI Technical Summary

Problems solved by technology

[0007] However, existing water-retaining slow-release and controlled-release fertilizers have shortcomings such as unstable water-holding performance, poor slow-release effect, and poor quality stability, which are not conducive to popularization.

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