Genotypic Differences in Grain Yield and Physiological Nitrogen Use Efficiency Among Rice Cultivars  

作　　者：ZHANG Ya-Li, FAN Jian-Bo, WANG Dong-Sheng and SHEN Qi-Rong2College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China) 

出　　处：《Pedosphere》2009年第6期681-691,共11页土壤圈（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 30771290 and 30671234)

摘　　要：Efficient use of N in agricultural practice can increase yield, decrease production costs and reduce the risk of environmental pollution. Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied at two experimental farms of Nanjing Agricultural University, Nanjing, China in 2004. Three high N use efficiency (NUE) rice cultivars (Wuyunjing 7, Nanguang and 4007) and one low NUE rice cultivar (Elio) with similar growth patterns were studied under seven N rates (0, 60, 120, 180, 240, 300 and 360 kg ha -1 ). Grain yield increased with the N application rate and attained plateau at 180 kg N ha -1 for rice cultivars at each site. Increasing N rate decreased PE for biomass and grain yield. Grain yield and PE of Elio were about 20% and 18% lower than those of high NUE cultivars. Differences in biomass, N accumulation and N redistribution were observed at the post-heading stage among rice cultivars with differing NUEs. The less reproductive tillers of Elio resulted in less demand for C and N during grain filling, thus leading to lower PE of Elio compared with the high NUE rice cultivars.Efficient use of N in agricultural practice can increase yield, decrease production costs and reduce the risk of environmental pollution. Effects of N fertilizer application rates on grain yield and physiological N use efficiency （PE） in relation to the accumulation and redistribution of biomass and N in rice （Oryza sativa L.） cultivars were studied at two experimental farms of Nanjing Agricultural University, Nanjing, China in 2004. Three high N use efficiency （NUE） rice cultivars （Wuyunjing 7, Nanguang and 4007） and one low NUE rice cultivar （Elio） with similar growth patterns were studied under seven N rates （0, 60, 120, 180, 240, 300 and 360 kg ha^-1）. Grain yield increased with the N application rate and attained plateau at 180 kg N ha^-1 for rice cultivars at each site. Increasing N rate decreased PE for biomass and grain yield. Grain yield and PE of Elio were about 20% and 18% lower than those of high NUE cultivars. Differences in biomass, N accumulation and N redistribution were observed at the post-heading stage among rice cultivars with differing NUEs. The less reproductive tillers of Elio resulted in less demand for C and N during grain filling, thus leading to lower PE of Elio compared with the high NUE rice cultivars.

关 键 词：ACCUMULATION BIOMASS N application rate REDISTRIBUTION 

分 类 号：S511[农业科学—作物学] F326.11[经济管理—产业经济]