EFFECT OF LIME NITROGEN ON THE EFFICIENCY OF UREA AND OTHER AMMONIUM NITROGEN FERTILIZERS

摘要

Five pot experiments were conducted with wheat and rice in a net house to study the effect of lime nitrogen (LN, contains about 55% calcium cyanamide) amendment rates on the efficiency of urea, the recovery urea-N-15, the efficiency of the three nitrogen fertilizers (NF), on the efficiency of urea in the three soils, and on NO3- -N leaching from a flooded soil. A rate of LN-N of 5-8% of applied fertilizer N increased the recovery of labeled urea-N by 9.42%. The effect of LN on the efficiency of NF was urea > ammonium sulfate > ammonium chloride. Under flooded conditions, LN decreased NO, formation and leaching.