Characteristic of ammonia volatilization of percarbamide in different acidity and alkalinity soils

Percarbamide is an important chemical product and a new fertilizer,widely using in foreign,but just beginning in china.Characteristic of ammonia volatilization of urea peroxide and urea in 3 acidic soils and 3 alkali soils were studied.The results indicated that ammonia volatilization intensity have the same tendency between urea peroxide and urea,and they followed the changes of soil pH: rose to maximum,and then fell in 6 soils with different maximum and different time.The maximum of ammonia volatilization intensity in 3 acidic soils and 3 alkali soils was the seventh day and the third day respectively;the initial ammonia volatilization intensity from urea peroxide was higher than that from urea in 6 soils,while the total ammonia volatilization quantity of urea peroxide were little smaller than urea in 3 acidic soils,and were little higher than urea in 3 alkali soils.