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| Study on Differences of Nitrogen Efficiency and Nitrogen Response in Different Oilseed Rape (Brassica napus L.) Varieties |
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Zhen-hua Zhang,
Hai-xing Song,
Qiang Liu,
Xiang-min Rong,
Jian-wei Peng,
Gui-xian Xie and Yu-ping Zhang |
Abstract:
Field experiment was carried out to evaluate the nitrogen efficiency and nitrogen response under no nitrogen application and nitrogen application conditions. The differences of grain yield, nitrogen absorption amount, nitrogen response and nitrogen use efficiency among 16 winter varieties of oilseed rape (Brassica napus L.) were systematically studied and the contribution of nitrogen absorption efficiency and nitrogen use efficiency to nitrogen efficiency in different oilseed rape varieties were preliminarily discussed. Results showed that, the differences of grain yield, nitrogen use efficiency and nitrogen response among the 16 oilseed rape varieties were significantly, regardless of N application level; but only under no N application conditions, the differences of nitrogen absorption amount among varieties were significantly. The 16 oilseed rape varieties were divided into four different genotypes in accordance with the nitrogen use efficiency and nitrogen response under no nitrogen application condition: (1) Nitrogen High Efficiency-Nitrogen High Response, included Xy1, Xy16, Xy17, Xh19, Xh20 and Xy21. (2) Nitrogen Low Efficiency-Nitrogen Low Response (NLE-NLR), included Xy6, Xy8 and Xy9. (3) Nitrogen High Efficiency-Nitrogen Low Response (NHE-NLR), included Xy7, Xy12, Xy14, Xy15 and Xy24. (4) Nitrogen Low Efficiency-Nitrogen High Response (NLE-NHR), included Xy11 and Xy13. The variation coefficient of nitrogen use efficiency was higher than nitrogen absorption efficiency, regardless of N application level; it was also showed that the contribution of nitrogen use efficiency to nitrogen efficiency was higher than nitrogen absorption efficiency. However, variation coefficient of nitrogen absorption efficiency under nitrogen application condition was higher than under no N application condition; variation coefficient of nitrogen use efficiency was reverse. It was indicated that, under no N application condition, the variation of nitrogen efficiency because of nitrogen use efficiency was decreased and variation of nitrogen efficiency because of nitrogen absorption efficiency was increased.
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How to cite this article:
Zhen-hua Zhang, Hai-xing Song, Qiang Liu, Xiang-min Rong, Jian-wei Peng, Gui-xian Xie and Yu-ping Zhang, 2009. Study on Differences of Nitrogen Efficiency and Nitrogen Response in Different Oilseed Rape (Brassica napus L.) Varieties. Asian Journal of Crop Science, 1: 105-112.
DOI: 10.3923/ajcs.2009.105.112
URL: https://scialert.net/abstract/?doi=ajcs.2009.105.112
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