Acetic ester coated controlled-release urea fertilizer and preparation technique

Abstract

The invention relates to a coated urea fertilizer, substantially an acetate starch-coated controlled-release urea fertilizer which is prepared by utilizing high-substitute degree acetate starch and a preparation process. The urea is implemented on coating by the coating material which is made by utilizing high-substitute degree acetate starch and other ingredients, so that the acetate starch-coated controlled-release urea fertilizer is generated; the coated urea can be ordinary bulky grain urea or the bulky grain urea with biochemical inhibitor on the surface; the biochemical inhibitor is urease inhibitor or / and nitrification inhibitor, thereby the acetate starch-coated controlled-release urea fertilizer is made. The most notable characteristic of the acetate starch-coated controlled-release urea fertilizer is that: the coating is implemented by utilizing the coating material high-substitute degree acetate starch which can be biodegraded fully, the soil environmental will not be polluted after being fertilized on by the coated urea fertilizer, thereby the coated urea fertilizer is a real green environment-friendly coated fertilizer. And the source of coated material is board and is easy to be obtained, and the price is lower, so the production cost of the coated urea fertilizer can be reduced greatly.

Description

technical field [0001] The invention relates to a coated urea fertilizer and its preparation, in particular to preparing the acetate starch coated controlled-release urea fertilizer and its preparation process by using acetate starch with a high degree of substitution. Background technique [0002] Urea is a cheap high-nitrogen chemical fertilizer. my country's current annual production capacity of urea is 40 to 45 million tons, while the annual agricultural production and consumption is 40 million tons. However, the overall utilization rate of urea nitrogen is only 35 to 40%, far from developed countries. There is a large gap between 50% and 60% of the national utilization rate, more nitrogen loss, and lower economic benefits of nitrogen application, which not only causes a huge waste of resources but also increases the cost of agricultural production. Long-term application of nitrogen fertilizers produces non-point source pollution, causing greenhouse effect and eutrophicat...

AI Technical Summary

Problems solved by technology

After urea is applied to the soil, it is quickly converted into ammonium nitrogen under the action of urease in the soil. A large amount of ammonium nitrogen makes the soil pH value rise rapidly and ammonia volatilization increases; Under the action of nitrification, ammonium nitrogen is converted into nitrite nitrogen and nitrate nitrogen in a short period of time. Nitrate nitrogen is easily leached in the soil, and nitrite nitrogen will also be converted into nitrogen oxides. The form is gaseous loss, resulting in a large loss of fertilizer nitrogen, thereby reducing the utilization rate of fertilizer nitrogen

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