Agronomic traits contributing to nitrogen efficiency of winter oilseed rape cultivars
Agronomic traits contributing to nitrogen efficiency of winter oilseed rape cultivars
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DOI：
10.1016/j.fcr.2011.06.009
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发表时间：
2011-10-09
影响因子：
5.8
通讯作者：
Horst, Walter J.
中科院分区：
文献类型：
--
作者：
Erley, Gunda Schulte auf'm;Behrens, Torsten;Horst, Walter J.
由于环境的原因，通过培育氮高效品种来减少油菜生产中出现的高氮（N）平衡盈余势在必行。在这项研究中，种子产量和氮效率参数的油菜品种在三个氮水平下进行了为期五年的田间试验。种子产量差异显着品种之间，特别是在限制氮供应，品种排名根据氮水平的显着变化。在高氮供应，品种差异更多地依赖于年效应。氮效率参数对产量的重要性因年份和施氮量的影响而异。在所有施氮水平下，氮吸收量都是影响产量的重要参数。在低氮条件下，氮素吸收的持续时间起决定性作用，而在高氮条件下，营养生长期的地上部氮素吸收能力相对更重要。随着施氮量的增加，氮素利用效率变得更加重要。在高氮供应条件下，籽粒氮浓度低的品种具有上级产量优势。收获指数也显着相关，产量在整个氮率：然而，它的重要性取决于环境条件。总之，可能有助于提高油菜氮效率的植物性状的规格将在很大程度上取决于目标环境和目标产量水平的氮供应。(C)2011爱思唯尔有限公司版权所有。
Reducing the high nitrogen (N) balance surpluses occurring in oilseed rape production through the cultivation of N-efficient cultivars is imperative for environmental reasons. In this study, seed yield and N efficiency parameters of oilseed rape cultivars grown under three N rates were investigated in field experiments performed during five years. Seed yields differed significantly among cultivars especially at limiting N supply, with significant shifts in cultivar ranking according to the N level. At high N supply, cultivar differences relied more on year effects. The importance of N efficiency parameters for yield varied owing to year and N rate effects. N uptake was an important parameter for yield at all N rates. While at low N, the duration of N uptake was most decisive, shoot N uptake capacity during vegetative growth was relatively more important under high N conditions. N utilization efficiency became more important with increasing N supply. At high N supply, cultivars with low seed N concentrations were superior in yield. Harvest index was also significantly correlated to yield across N rates: however, its importance depended much on environmental conditions. In conclusion, the specification of plant traits that might contribute to enhanced N efficiency in oilseed rape will depend very much on the N supply of the target environment and the target yield level. (C) 2011 Elsevier B.V. All rights reserved.