| 摘要 |
A liquid fertilizer composition comprises an aqueous solution of one or more substantially water soluble triazone compounds, one or more urea compounds, the triazone compound:urea compound weight ratio being 0.48:1 or more, and contains not more than the indicated amounts (dry weight basis) of the following: methylene diurea compounds 3% monomethylol urea compounds 7% hexamethylenetetramine compounds 2%, the triazone compound:methylene diurea compound weight ratio being 6:1 or more. The composition is prepared by (a) reacting in aqueous solution a urea, an aldehyde and ammonia or a primary amine; (b) thereafter further reacting in a first heating stage at a temperature between 80 DEG C-95 DEG C whilst adding aldehyde, urea or amine (or ammonia) to maintain the ratios of ingredients, and in a second stage at 80-95 DEG C to give a final reaction product having a triazone compound:unreacted urea compound weight ratio of at least 0.48. |
