Study on~(15)N Labeled Rice Controlled Release Fertilizerin Increasing Nitrogen Utilization Efficiency

LIU De-lin 1,NIE Jun 2,XIAO Jian 2 (1.Institute for Application of Atomic Energy in Agriculture,Changsha 410125,Hunan,China; 2.Soil and Fertilizer Institute of Hunan, Changsha 410125,Hunan,China)  

This paper deals with effect of rice controlled release fertilizer and urea on nitrogen efficiency utilized by rice plant and fate of nitrogen by using 15 N trace technique.Results showed that NH 3 volatilization losses of urea and rice controlled release nitrogen fertilizer in 11 days of fertilizer application occurred 1.81% and 0.69% of applied N,respectively. The amount of NH 3 volatilization loss reached a maximum value in the five days of nitrogen application,after this,was decreased gradually. Leaching losses of nitrogen from urea and rice controlled release fertilizer occurred 1.02% and 0.95% of applied N,respectively. The leaching loss of N from rice controlled release fertilizer changed smoothly during the whole growth period of rice plant,and only increased a little until 40 days after fertilizer application,hereafter,was decreased slowly again. Nitrification-denitrification loss of rice controlled release fertilizer was 3.46%,but that of urea was as high as 37.75%. Residual fertilizer nitrogen in soil was remained in the soil layer of 0-35cm depth and reached 91.4%-91.5%. There was trace amount residual nitrogen under the soillayer of 35cm depth. The total residual nitrogen of rice controlled release fertilizer was slightly more than that of urea. Nitrogen recovery of rice controlled release fertilizer treatment was 73.8% and was higher 34.9% than that of urea. The high N recovery of rice controlled release nitrogen fertilizer may be explained by more following reasons:(1)nitrogen release in its granulated fertilizer was controlled;(2) there was lower leaching nitrogen and lower NH 3 volatilization,especially smaller nitrification-denitrification loss. In condition of equal amount of nitrogen applied,rice grain yield in controlled release nitrogen fertilizer treatment was increased by 25.5% than in urea treatment and which was the significance level in p= 0.05.

【Fund】： 湖南省九五重大科技攻关项目 (99NKY10 0 4 0 7)
【CateGory Index】： S511.062

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