Special slow-release fertilizer for oranges and production process of special slow-release fertilizer

Abstract

The invention provides a special slow-release fertilizer for oranges. The special slow-release fertilizer comprises raw materials including urea, potassium nitrate, monoammonium phosphate, potassium sulfate, a slow release adhesive, an organic fertilizer, chitosan resin, borax, ammonium molybdate, humic acid and formaldehyde as well as an active calcium silicon magnesium fertilizer. The specific preparation method is implemented as follows: urea, water and sodium hydroxide are added to a urea formaldehyde reaction tank and heated to 90 DEG C-100 DEG C, formaldehyde is added to the reaction tank, and the mixture is mixed and stirred; after the urea and the formaldehyde solution react and most of the urea and the formaldehyde solution produce a hydroxymethyl urea solution, an industrial sulfuric acid or phosphoric acid is added, and a urea formaldehyde solution is produced; the urea formaldehyde solution enters a buffer tank through a valve; the preparation procedure is implemented as follows: the raw materials of the urea slow-release fertilizer are mixed and conveyed to a rotor drum granulator, the raw materials are rolled and mixed with the sprayed urea formaldehyde solution, and agglomeration, adhesion, granulation, drying, cooling and screening are performed; the special slow-release fertilizer for the oranges can be obtained. The special slow-release fertilizer researched according to specific demands of the oranges guarantees sufficient supply of nitrogen elements.

Description

technical field [0001] The invention provides a multivariate high-efficiency slow-release compound fertilizer and a production process thereof, in particular to a special slow-release compound fertilizer for citrus. Background technique [0002] Urea-formaldehyde slow-release fertilizer is a new type of fertilizer, which has the function of slow and controlled release. The fertilizer utilization rate is about 20% higher than that of ordinary compound fertilizers, and at the same time, it reduces the non-point source pollution of fertilizers to soil and water systems. Our country has started research and trial production of it since the 1970s, but only a few small-scale pilot plants have been built. In 2005, a company in Qingdao began to initially produce urea-formaldehyde compound fertilizer. [0003] On June 25, 2009, the China Urea-Formaldehyde Fertilizer Technology Forum was held in Beijing. The participating experts discussed the promotion and development of urea-formal...

AI Technical Summary

Problems solved by technology

However, while my country's citrus industry is developing, many problems have also been exposed, such as few good varieties, unreasonable variety structure, low per unit yield, poor product quality, and low product added value.

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