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

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• 作者：Ya-Li ZHANG ; Jian-Bo FAN ; Dong-Sheng WANG ; Qi-Rong SHEN
• 关键词：accumulation ; biomass ; N application rate ; redistribution
• 刊名：Pedosphere
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：19
• 期：6
• 页码：681-691
• 全文大小：204 K

文摘

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.