Preparation process for urea formaldehyde slow-release and controlled-release compound fertilizer

Abstract

The invention relates to the field of fertilizers for crops and particularly relates to a preparation process for a urea formaldehyde slow-release and controlled-release compound fertilizer. The preparation process is characterized by comprising the following steps of: (1) adding 430kg of urea into a reaction kettle, adding water with the weight equal to 1.5-4 times of mass of the urea and stirring to dissolve the urea, regulating the pH to be 8-9 by utilizing borax and potassium hydroxide, and carrying out stirring reaction for about 1 hour at 75-80 DEG C; (2) adding oxidized starch with the weight equal to 8-10% of that of the urea, stirring for 15-20 minutes, and regulating the pH to be neutral by utilizing calcium oxide, so as to prepare a urea formaldehyde slow-release agent; and (3) weighing solid materials which are crushed to be 80 meshes according to the weight ratio of nitrogen to phosphorus to potassium to middle-trace elements being 4:1:2:1, putting the solid materials into a stirring machine to be uniformly stirred, putting the uniformly stirred materials into a pelletizer, and spraying the urea formaldehyde slow-release agent to carry out pelleting. With the adoption of the technical scheme, the novel slow-release and controlled-release compound fertilizer has the advantages that not only can the utilization rate of the fertilizer be improved, the food security can be guaranteed, and the environmental pollution can be alleviated; lifetime requirements of crops can be met after the fertilizer is applied once, the labor intensity of famers can be greatly alleviated, and the production inputs can be decreased.

Description

technical field [0001] The invention relates to the field of crop fertilizers, in particular to a preparation process of urea-formaldehyde slow-controlled release compound fertilizer. Background technique [0002] In my country, with the continuous increase in the amount of chemical fertilizers, the modification of fertilizers is particularly important under the multiple objectives of pursuing both yield and quality of agricultural products and environmental friendliness. It is a simple and easy measure to develop slow and controlled release fertilizers, improve fertilizer utilization rate and reduce environmental pollution, especially suitable for China's national conditions. [0003] The education level of farmers in our country is low, the land area of ​​farmers is small and scattered, the planting system is complex, the degree of mechanization is low, the agrochemical service system is difficult to establish and in place, and it is difficult to provide convenient servic...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new production process for chemically synthesizing urea-formaldehyde slow-controlled release compound fertilizers, aiming at the low nutrient utilization rate of ordinary compound fertilizers, short fertilizer effect period, and environmental pollution caused by long-term application. Urea formaldehyde slow and controlled release compound fertilizer is a new type of environmentally friendly fertilizer. It can intelligently provide the soil with the required nutrients continuously and steadily for various crops, vegetables, and fruits. It has dual functions of slow release and controlled release.