Matrix carrier type slow-release urea based on straw and preparing method thereof

Abstract

The invention discloses matrix carrier type slow-release urea based on straw and a preparing method thereof. The matrix carrier type slow-release urea is prepared from 74-97.48 parts of urea, 2.5-20 parts of straw, 0.01-4 parts of polyacrylamide and 0.01-2 parts of ferric salt. The preparing method includes the steps that straw is smashed, and the smashed powder, polyacrylamide and ferric salt are sequentially added into urea melt or mixed and added into the urea melt; the mixture is stirred fully, and mixed slurry is prepared into slow-release urea in different particle sizes. The developed matrix carrier type slow-release urea based on the straw is applied to farmlands, nitrogen volatilization and leaching loss are reduced, the use ratio of nitrogen is increased, a carbon source can be provided for soil microorganisms, microbial activity is stimulated, effectiveness of nitrogen is improved, soil organic matter is increased, and the soil structure is improved. The problems that chemical fertilizer is low in use ratio, crop straw burning causes defaults and the straw is difficult to use are solved. The straw-based matrix carrier type slow-release urea is simple in production process and low in cost and has broad application prospects.

Description

technical field [0001] The invention relates to a slow-release urea, in particular to a straw-based substrate carrier type slow-release urea and a preparation method thereof. Background technique [0002] Chemical fertilizers are important means of agricultural production and the "grain" of food. Since the reform and opening up, my country's agriculture has developed rapidly. my country has fed 22% of the world's population with less than 10% of the world's arable land. However, due to the small land and large population, food security is still the core issue of my country's agriculture. From 1978 to 2014, my country's grain output more than doubled from 305 million tons to 602 million tons, while the amount (pure amount) of inorganic fertilizers increased from less than 10 million tons to nearly 60 million tons. However, the cultivated area of ​​grain crops has decreased from 121 million hectares to 112 million hectares, indicating that the increase in my country's grain pr...

AI Technical Summary

Problems solved by technology

At present, there are many laboratory studies on matrix fertilizers, and there are few large-scale products. The main problems are: (1) The nutrient load of the selected matrix carrier is low, such as hydrogel, etc. The application weight of rubber carrier fertilizer is relatively large, the cost of transportation and application is high, and its long-term application may damage the physical structure of the soil, which is not conducive to large-scale application; (2) The selected matrix carrier is a non-renewable resource, such as vermiculite and zeolite , bentonite and montmorillonite, etc., long-term large-scale application of inorganic minerals may cause damage to the original physical structure of the soil, and as non-renewable resources, they are not suitable for the sustainable development of modern agriculture; (3) the selected matrix carrier The sources are relatively narrow, such as ceramic industrial waste residue, alginate industrial waste residue, cellulose, lignin and starch, which limit its large-scale application in bulk food crops

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