Analysis of Nitrogen Use Efficiency of Base Fertilizer of Rice under Different Crop Management Practices by Using 15N Labeling
The 15N labeling was used to trace the fate of base fertilizer nitrogen through to provide theoretical and practical basis for the efficient nitrogen fertilizer management practices in rice.Wuyunjing 24 was used as the experimental material in a two-year field experiment.The effects of different cultivation measures on nitrogen use efficiency of rice base fertilizer were studied by using five treatments(nitrogen blank area,local conventional cultivation,and comprehensive management measures 1-3),such as increasing density and reducing nitrogen,shifting nitrogen before and after,light dry and wet alternate irrigation,and increasing cake fertilizer.The results showed that 25.76％,24.46％,and 49.78％of the nitrogen from the base fertilizer were absorbed by the plants,remained in the soil,and lost to the environment,respectively.Compared with local farmers'practice,integrated crop management can significantly increase the uptake ratio of basal nitrogen fertilizer by crops(38.8％-61.3％),reduce the residual ratio in soil(10.3％-24.8％),and reduce the ratio of basal nitrogen fertilizer entering the environment(1.8％-1 8.1％).Compared with the local farmers'practice,the integrated crop management had higher nitrogen accumulations all the growth stages;the integrated crop management significantly improved the nitrogen absorption of the basal fertilizer by the plants,reduced the nitrogen loss,and significantly increased the partitioning of nitrogen to the grains.The integrated crop management practices also improved soil quality,the activities of soil urease and catalase.The comprehensive research results showed that the nitrogen absorption of plants,the soil quality,the nitrogen storage capacity of soil,the nitrogen utilization rate of base fertilizer and the yield could be significantly increased by optimizing cultivation measures.
RiceBasal fertilizer nitrogenYieldNitrogen use efficiency
NETL
NSTL
万方数据
