Comparison of high-yield rice in tropical and subtropical environments: II. Nitrogen accumulation and utilization efficiency
作者： Jifeng Ying , Shaobing Peng , Gaoqun Yang , Neng Zhou , Romeo M Visperas
DOI: 10.1016/S0378-4290(97)00121-4
关键词: Agronomy 、 Biology 、 Straw 、 Crop 、 Subtropics 、 Yield (wine) 、 Cultivar 、 Nitrogen 、 Oryza sativa 、 Nitrogen accumulation
摘要: Nitrogen requirements to achieve rice grain yields higher than 13 t ha−1 and the associated internal N-utilization efficiency (NUE) have not been documented. The objective of this study was compare N accumulation NUE irrigated in tropical subtropical environments at yield-potential levels both climates. Field experiments were conducted 1995 1996 International Rice Research Institute, Philippines (IRRI, site), Taoyuan Township, Yunnan, China (subtropical site). Three five high-yielding cultivars grown under optimum crop management. Plants sampled key growth stages determine tissue concentration, plant accumulation, harvest index (NHI), translocation ratio NUE. Plant maturity 19 30% greater Yunnan IRRI. Most difference resulted from uptake rate during vegetative period During reproductive grain-filling periods, similar or IRRI Yunnan. Grain concentration lower straw grains filling IRRI, these traits contributed larger NHI Cultivars that produced over required about 250 kg within had a 59 64 per N.
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