دورية أكاديمية
Effect of nitrogen fertilization on nitrogen dynamics in oilseed rape using 15N-labeling field experiment
| العنوان: | Effect of nitrogen fertilization on nitrogen dynamics in oilseed rape using 15N-labeling field experiment |
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| المؤلفون: | J. Gombert, F. Le Dily, J. Lothier, P. Etienne, L. Rossato, J.M. Allirand, A. Jullien, A. Savin, A. Ourry |
| المصدر: | Journal of Plant Nutrition and Soil Science |
| بيانات النشر: | Wiley-VCH Verlag |
| سنة النشر: | 2010 |
| المجموعة: | Université Angers: Okina (Open Knowledge, INformation, Access) |
| مصطلحات موضوعية: | Brassica napus L, nitrogen, remobilization, stable isotope, Uptake |
| الوصف: | In order to optimize nitrogen (N) fertilization and to reduce the environmental impact of oilseed rape without decreasing yield, a clearer understanding of N dynamics inside the plant is crucial. The present investigation therefore aimed to study the effects of different N-application rates on the dynamics of N uptake, partitioning, and remobilization. The experiment was conducted on winter oilseed rape (Brassica napus L. cv. Capitol) under three levels of N input (0, 100, and 200 kg N ha–1) from stem elongation to maturity using 15N-labeling technique to distinguish between N uptake and N retranslocation in the plant. Nitrogen fertilization affected the time-course of N uptake and also the allocation of N taken up from flowering to maturity. Most pod N came from N remobilization, and leaves accounted for the largest source of remobilized N regardless the N-application rate. However, the contribution of leaves to the remobilized N pool increased with the N dose whereas the one of taproot decreased. Stems were the main sink for remobilized N from stem elongation to flowering. Leaves remained longer on N200 than on N0 and N100 plants, and N concentration in fallen leaves increased with the N treatment and in N100 plants along an axial gradient from the basal to the upper leaves. Overall, these results show that the timing of N supply is more crucial than the N amount to attain a high N efficiency. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://okina.univ-angers.fr/publications/ua11654Test |
| DOI: | 10.1002/jpln.200800270 |
| الإتاحة: | https://doi.org/10.1002/jpln.200800270Test http://okina.univ-angers.fr/publications/ua11654Test |
| رقم الانضمام: | edsbas.9618E67E |
| قاعدة البيانات: | BASE |
| DOI: | 10.1002/jpln.200800270 |
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