Applying the 3 long-lasting nitrogen,i e paint coat urea,long-lasting urea,long-lasting ammonium
bicarbonate and the commom
urea,pot experiments had been carried out The result showed that:(1)The volatile loss of ammonia of common urea on the quaternary earth-origirated latosolic red earths was 4 7-26 5% more than that of paint coat urea,long-lasting urea and long-lasting ammonium
bicarbonate;In the latosolic red earths of shallow sea deposit sediment parent-matevial,the volatile loss of ammonia of common urea was equivalent to that of the long-lasting ammonium bicarbonate but was 14 2-16 0% more than that of the other two kinds of long-lasting
nitrogen;(2)The nitrogen supplying process and level of paint coat urea,long-lasting urea,long-lasting ammoniun bicarbonate and common urea on limestone brown soil and quaternary earth-originated latosolic red earths were quite different;(3) In quaternary red earth-originated latosolic red earths, the output of dried organism of corn after applying long-lasting nitrogen fertilizer increased by 7 5-16 7% comparing that of applying common urea;the utilization rate of nitrogen of long-lasting nitrogen pertilizer was 2 3-8 7% higher than that of common urea;The residue of the rapid available nitrogen in the soil to which long-lasting nitrogen fertilizer was applied was 3-4mg/kg higher than that of the common urea