Pedosphere 19(6): 681--691, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Genotypic differences in grain yield and physiological nitrogen use efficiency among rice cultivars
ZHANG Ya-Li, FAN Jian-Bo, WANG Dong-Sheng and SHEN Qi-Rong
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China)
ABSTRACT
      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.
Key Words:  accumulation, biomass, N application rate, redistribution
Citation: Zhang, Y. L., Fan, J. B., Wang, D. S. and Shen, Q. R. 2009. Genotypic differences in grain yield and physiological nitrogen use efficiency among rice cultivars. Pedosphere. 19(6): 681-691.
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