Relationship between nitrogen uptake and use efficiency of winter wheat grown in the North China Plain
文献类型: 外文期刊
作者: Tong, Y. P.;Wang, R. F.;An, D. G.;Hu, C. S.;Zhang, Y. M.;Jia, Y. G.;Li, L. H.;Wang, R. F.
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关键词: nitrate: 14797-55-8;nitrogen: 7727-37-9;nutrientChina: Asia;Palearctic region;root dry weight;physiological mechanism;genotype variation
期刊名称: CROP & PASTURE SCIENCE
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收录情况: SCI
摘要: Wheat (Triticum aestivum L.) cultivars with improved nitrogen-use efficiency (NUE) under low and medium N conditions will help to minimise production costs and nitrate-N contamination. The study was conducted to determine the NUE diversities of winter wheat genotypes, and to evaluate the possible physiological mechanisms contributing to these differences. A set of 12 winter wheat genotypes, including S4185 as control genotype, were grown at high N (applied with 180 kg N/ha as urea) and low N (with no N fertiliser, N-deficient) plots in 2005-06 and 2007-08 growing seasons (i.e. four environments). ANOVA showed significant differences among genotypes for all traits measured. Among genotypes, XJ19-1 had significantly higher NUE and N uptake efficiency (NUpE) than S4185 at the two N levels in the 2 years (P < 0.05). KN9204 had significantly higher NUE in the four environments and higher NUpE in three out of four environments than S4185 (P < 0.05). WR9603 and XJ138-1 had higher NUE and NUpE than S4185 in two or three out of four environments (P < 0.05). XJ19-1, KN9204, WR9603 and XJ138-1 also showed higher grain yield (GY) and aboveground dry matter (DM) than S4185 in at least two environments (P < 0.05). KN9204 were 45.7 and 23.1% higher in root dry weight (RDW) of the top 40-cm soil profile compared with J411 at high N and low N plots, respectively (P < 0.05). In addition, there was a highly positive correlation between RDW and grain N yield (GNY) of KN9204 and J411 (P < 0.01). Closely positive correlation between NUE and GY, DM, GNY and NUpE at both N levels in the 2 years (P < 0.01), and between N utilisation efficiency (NUtE) and NUE only at high N plot (P < 0.05) were found. Our results indicated that NUpE was the important factor of NUE under low N conditions, and both NUpE and NUtE were the most important NUE components under high N conditions.
分类号: S
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