A kind of long-acting fertilizer for paddy field and preparation method thereof

Abstract

The invention discloses a long-acting fertilizer for paddy fields, comprising the following raw materials: nitrogen fertilizer, potassium fertilizer, superphosphate, ammoniated lignite, corn starch, solidifying agent, calcium powder and polyacrylamide; the preparation method of the above raw materials is: (1) Weigh each raw material according to the parts by weight of the long-acting fertilizer for paddy fields, for subsequent use; (2) pulverize nitrogen fertilizer, potash fertilizer, superphosphate and ammoniated lignite, and mix to obtain mixture I; (3) add calcium in mixture I powder and curing agent, stir evenly to obtain mixture II; (4) dissolve polyacrylamide in water to prepare polyacrylamide solution; (5) granulate mixture II, and during the granulation process, the polyacrylamide solution is It is sprayed on the mixture II, dried and cooled to obtain long-acting fertilizer for paddy fields. In the present invention, the fertilizer prepared by using the above-mentioned raw materials and preparation method has water immersion stability.

Description

technical field [0001] The invention relates to the technical field of compound fertilizers, in particular to a long-acting fertilizer for paddy fields and a preparation method thereof. Background technique [0002] Paddy fields are mostly used to grow aquatic plants such as rice, water jasmine, and lotus root. my country is the largest rice producing and consuming country in the world. More than 60% of the population eat rice all year round. Therefore, rice is also one of the most important food crops in my country. At this stage, my country's rice planting area accounts for more than 20% of the world's total rice planting area, and the annual grain output reaches 185 million tons, accounting for one-third of the world's total grain production. Rice is a fertilizer-loving plant. The growth and development of rice can be divided into different periods such as seedling, tiller, booting, heading, flowering, and maturity. Therefore, it needs to be fertilized in different perio...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it can be seen that there are the following problems in rice fertilization: first, the nutrient distribution ratio is unreasonable, which cannot meet the nutrient demand of rice throughout the growth period; Crop absorption, serious waste of fertilizers; third, the application of chemical fertilizers is likely to cause eutrophication of water bodies, and there is a risk of non-point source pollution, polluting the environment

Therefore, this technology mainly uses organic-inorganic composite carbon materials and livestock and poultry manure carbides to maintain the long-term effectiveness of fertilizers, and its manufacturing costs are relatively high.

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