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《Chinese Journal of Rice Science》 2017-01
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Effects of Slow-release Urea on Nitrogen Utilization and Yield in Mechanically-transplanted Rice under Different Nitrogen Application Rates

WANG Haiyue;LI Yue;SUN Yongjian;LI Yinghong;JIANG Mingjin;WANG Chunyu;ZHAO Jianhong;SUN Yuanyuan;XU Hui;YAN Fengjun;MA Jun;Rice Research Institute,Sichuan Agricultural University,Key Laboratory of Crop Physiology,Ecology,and Cultivation in Southwest China,Ministry of Agriculture;Institute of Plateau Meteorology,China Meteorological Administration;  
【Objective】Effects of different nitrogen(N) application rates(150 kg/ hm~2 and 180 kg/ hm~2) and slow-release urea on N utilization and grain yield and its physiological characteristics in mechanical transplanted rice were studied to lay a scientific base for high-efficient N utilization in mechanical transplanted rice.【Method】Hybrid rice Chuanguyou 7329 was used to investigate the effects of nitrogen(N) application rates and various slow-release urea ratios to conventional urea,(10∶ 0,7∶ 3,5∶ 5,3∶ 7 and 0∶ 10,respectively) on N utilization efficiency(NUE),grain yield and its physiological characteristics of mechanical-transplanted rice,as well as the correlation between N utilization,grain yield and physiological characteristics.【Result】The results showed that N application rates and slow-release urea combined with conventional urea had significant effects on NUE and grain yield.The N utilization at jointing,heading,and filling stage,and the N translation amount of stem-sheath during filling stage had a significant positive correlation with dry matter weight,N accumulation,N apparent use efficiency,spikelet number per panicle and grain yield.Compared with conventional urea,slow-release urea or slow-release urea combined with conventional urea could significantly increase dry matter accumulation,N accumulation,photosynthetic potential,leaf area index(LAI),N apparent use efficiency,and N increment of panicle in mechanical-transplanted rice.【Conclusion】According to grain yield and NUE,the higher grain yield and NUE were obtained at the N application rate of 180 kg/ hm~2,especially at the ratio of slow-release urea to conventional urea 7∶ 3,0.84%-26.59% and 0.28%-47.02% higher than that of other treatments,respectively.This treatment could also enhance the NUE and grain yield,which was the optimum N management in this experiment.Moreover,LAI,photosynthetic potential and dry matter accumulation decreased with the decline of the proportion of slow-release urea,and these indexes were the lowest in the treatment of whole conventional urea,which were not conducive to NUE and grain yield of mechanical-transplanted rice.
【Fund】: 国家科技支撑计划资助项目(2013BAD07B13);; 四川省教育厅重点项目(16ZA0044);; 四川省科技支撑计划资助项目(2014NZ0040 2014NZ0041 2014NZ0047)
【CateGory Index】: S511.21
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