Effects of
high efficiency urea on the loss of ammonia volatilization and nitrogen fate were studied by
the methods of ammonia volatilization model system and 15 N tracer technique.Compared with common urea,
high efficiency urea applied to three kinds of soil could put off the initial time and the high time of ammonia volatilization and cut down the rate of ammonia volatilization It reduced the amount of ammonia volatilization by 18 9%～44 1% The nitrogen content in the rice plant from fertilizer and soil was increased apparently.Current
nitrogen utilization rate of the treatment with high efficiency urea was increased by 28 3%～31 8% and the increase of residual N in soil ranged from 5 3% to 12 0% which resulted in the decrease of the loss of fertilizer N by 17 0%～19 3% Yield of rice applied with high efficiency urea was increased by 27 0%～29 3% compared with that of rice applied with common urea of equal N content.