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Studies of Granulation of Compound Fertilizers Containing Urea

其他書名	A Literature Review
出版	National Fertilizer Development Center, 1976
URL	http://books.google.com.hk/books?id=SSaatgAACAAJ&hl=&source=gbs_api

註釋Urea has been used commercially in production of compound fertilizers based on superphosphate or ammonium phosphate. Granulation of compound fertilizers containing both urea and superphosphates (single or triple) is more difficult than it is when ammonium phosphate replaces all the superphosphate. Urea will react with compounds in the superphosphate to form excessive liquid phase unless the pH is increased by addition of ammonia or other basic materials such as chalk (CaCO3).