Title: Urea fertilizer based on coal with long effect and process for manufacturing same
Application Number: 90105133 Application Date: 1990.05.31
Publication Number: 1056862 Publication Date: 1991.12.11
Approval Pub. Date: Granted Pub. Date: 1996.09.18
International Classifi-cation: C05C9/00
Applicant(s) Name: Shenyang Inst. of Applied Ecology, Chinese Academy Address: 110000
Inventor(s) Name: Li Ronghua, Zhang Desheng
Attorney & Agent: WANG HUIMIN
Abstract:
     This coal-base long-active urea is a mixture of 1-15% coal base (brown coal, weathered coal or peat) as urease inhibitor and urea, and is made up by addition of two technological steps 1.e., adding coal-base powder and mixing them besides using process of synthesizing urea. This urea fertilizer has an increasement of 20% in its utilization and is suitable for various crops. If it is used as base manure, only applying it once the yield of crops can be increased by over 10%. It can also improve the structure and fertility of soil.
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