NDLI: Does genotypic variation in nitrogen remobilisation efficiency contribute to nitrogen efficiency of winter oilseed-rape cultivars (Brassica napus L.)?

Content Provider	Springer Nature Link
Author	Ulas, Abdullah Behrens, Torsten Wiesler, Franz Horst, Walter J. Schulte auf’m Erley, Gunda
Copyright Year	2013
Abstract	Winter oilseed-rape production is characterized by a low N efficiency, due to low N uptake and insufficient N remobilisation to the seeds. In particular, a reduction of leaf N losses might be one way to improve N efficiency of this crop. It was tested if variations in leaf N losses and in stem residual N amounts at maturity exist between cultivars differing in N efficiency.In a 3-year field experiment, four oilseed rape cultivars were cultivated at limiting, medium, and high N supply.N harvest indices in this study were comparatively high (around 0.79) and leaf N losses amounted to at most 13 kg N ha$^{−1}$. 86 % of the leaf N present at the beginning of flowering was remobilised, irrespective of N rate or cultivar. Nevertheless, genotypic variation in leaf N loss existed. They were mainly due to differences in leaf N accumulation until flowering. Residual N in stems (up to 33 kg N ha$^{−1}$) was higher than leaf N losses and varied more between treatments but was not related to genotypic variation in yield.N uptake after flowering was more important than N remobilisation from vegetative biomass for genotypic variation in seed yield both at low and high N supply.
Starting Page	463
Ending Page	471
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	371
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	N partitioning Leaf N losses Stem N remobilisation Post-flowering N uptake Genotypic variation Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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