Pedosphere 17(6): 792--800, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
N accumulation and translocation in four japonica rice cultivars at different N rates
ZHANG Yao-Hong, FAN Jian-Bo, ZHANG Ya-Li, WANG Dong-Sheng, HUANG Qi-Wei and SHEN Qi-Rong
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China)
ABSTRACT
      Developing high-yielding rice (Oryza sativa L.) cultivars depends on having a better understanding of nitrogen (N) accumulation and translocation to the ear during the reproductive stage. Field experiments were carried out to evaluate the genetic variation for N accumulation and translocation in different Japonica rice cultivars at different N rates and to identify any relationship to grain yield in southeast China. Four Japonica cultivars with similar agronomic characteristics were grown at two experimental sites in 2004 with three N rates of 0, 60, and 180 kg N ha-1. Dry weights and N contents of rice plants were measured at tillering, initiation, anthesis, and maturity. Grain yields exhibited significant differences (P < 0.05) among the cultivars and N application rates. Increasing N rates improved N uptake at anthesis and maturity in all four cultivars (P < 0.05). N translocation from vegetative organs to the grains increased with enhanced N rates (P < 0.05). N translocation to the grains ranged from 9 to 64 kg N ha-1 and N-translocation efficiency from 33% to 68%. Grain yield was linear to N uptake at anthesis (r2 = 0.78**) and N translocation (r2 = 0.67**). Thus, cultivars with a high N uptake at anthesis, low residual N in the straw at maturity, and appropriate low N fertilizer supply in southeast China should efficiently increase N-recovery rate while maintaining grain yield and soil fertility.
Key Words:  grain yield, Japonica rice cultivar, N accumulation, N application rate, N translocation
Citation: Zhang, Y. H., Fan, J. B., Zhang, Y. L., Wang, D. S., Huang, Q. W. and Shen, Q. R. 2007. N accumulation and translocation in four japonica rice cultivars at different N rates. Pedosphere. 17(6): 792-800.
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