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《Chinese Journal of Rice Science》 2010-02
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Characteristics of Population Development and Yield Formation of Rice under Triangle- Planted System of Rice Intensification at Different Nitrogen Application Amounts

LONG Xu1,2,WANG Ren-quan1,SUN Yong-jian1 , MA Jun1, (1Rice Research Institute,Sichuan Agricultural University,Wenjiang 611130,China;2Chengdu Vocational College of Agricultural Science and Technology,Wenjiang 611130,China)  
Hybrid rice combination Gangyou 527 was used to investigate the characteristics of population development and yield formation under triangle-planted system of rice intensification (TSRI) and traditional cultivation at different N application amounts.Rice plants under TSRI showed increased tiller number of plant population and percentage of productive tillers,high percentage of efficient leaf area index and photosynthetic rate of flag leaves,significantly enhanced root activity,and promoted dry matter accumulation and transportation during grain filling compared with traditional cultivation.Furthermore,suitable N application amount (200 kg/hm2) under TSRI enhanced fully rational use of soil and space resources and improved population quality remarkably,and was helpful to coordinate the conflict among effective panicle number,filled grain number per panicle,seed setting rate and grain filling rate.Applying more nitrogen (240 kg/hm2) resulted in a negative effect,leading to reduced dry matter accumulation and transportation and decreased yield,which suggests yield increase under TSRI should not rely on high nitrogen rate.
【Key Words】: rice system of rice intensification nitrogen application amount population development characteristics grain yield
【Fund】: 国家粮食丰产科技工程资助项目(2004BA520A05);; 四川省科技厅重点资助项目
【CateGory Index】: S511
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