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Pedosphere
Year: 2007  |  Volume: 17  |  Issue: 6  |  Page No.: 792 - 800

N Accumulation and Translocation in Four Japonica Rice Cultivars at Different N Rates

Yao-Hong ZHANG, Jian-Bo FAN, Ya-Li ZHANG, Dong-Sheng WANG, Qi-Wei HUANG and Qi-Rong SHEN    

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 effciency 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 effciently increase N-recovery rate while maintaining grain yield and soil fertility.

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