中国水稻科学2017，Vol.31Issue(1)：50-64,15.DOI:10.16819/j.1001-7216.2017.6072
不同施氮水平下缓释氮肥配施对机插稻氮素利用特征及产量的影响
Effects of Slow-release Urea on Nitrogen Utilization and Yield in Mechanically-transplanted Rice under Different Nitrogen Application Rates
摘要
Abstract
[Objective]Effects of different nitrogen (N)application rates (150 kg/hm2and180kg/hm2 )and slow-re-lease urea on N utilization and grain yield and its physiological characteristics in mechanical transplanted rice were stud-ied to lay a scientific base for high-efficient N utilization in mechanical transplanted rice.[Method]Hybrid rice Chuan-guyou 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.Com-pared 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 ef-ficiency,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/hm2 ,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.关键词
缓释氮肥/机插稻/氮素利用/产量Key words
slow-release N fertilizer/mechanical-transplanted rice/N utilization/yield分类
农业科技引用本文复制引用
王海月,李玥,孙永健,李应洪,蒋明金,王春雨,赵建红,孙园园,徐徽..不同施氮水平下缓释氮肥配施对机插稻氮素利用特征及产量的影响[J].中国水稻科学,2017,31(1):50-64,15.基金项目
国家科技支撑计划资助项目(2013BAD07B13) （2013BAD07B13）
四川省教育厅重点项目(16ZA0044) （16ZA0044）
四川省科技支撑计划资助项目(2014NZ0040,2014NZ0041 ,2014NZ0047). （2014NZ0040,2014NZ0041 ,2014NZ0047）
