VERDENAL, T.; SPANGENBERG, J.e.; DIENES-NAGY, Á.; ZUFFEREY, V.; SPRING, J.-L.; VIRET, O.; VAN LEEUWEN, Cornelis

doi:10.1111/ajgw.12532

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Australian Journal of Grape and Wine Research. 2022-07, vol. 28, n° 3, p. 358-373

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Background and Aims Knowing the impact of cultural practices on nitrogen (N) dynamics in perennial crops is critical to promote N use efficiency. This study focused on the impact of crop regulation on the plant N dynamics, on the fruit N composition, and on the N fertilisation use efficiency. Methods and Results A large crop load gradient was set in a homogeneous plot of the grape cultivar Chasselas. Fertilisation in the form of 15N-labelled foliar urea allowed the measurement of N uptake and partitioning among plant fractions. Dry mass, carbon, and N dynamics were assessed over two consecutive seasons. Crop regulation did not affect grape N concentration at harvest. Both N uptake and root N mobilisation were reduced in response to crop regulation. Fertilisation efficiency was higher under high-yield conditions in terms of N uptake and grape N accumulation. The carry-over effects of crop regulation in the following year were highlighted. Conclusions Crop regulation strongly affects the overall plant N cycle, that is, uptake, distribution and release. Crop regulation improves must sugar concentration at harvest, while N concentration remained unchanged. The efficiency of N fertilisation varies greatly with crop load, which limits the interest of fertilisation under low-yield conditions. Significance of the Study These results contribute to the development of accurate nutrition models and sustainable cultural practices.< Réduire

Mots clés en anglais

15N isotope labelling

Amino acids

Foliar urea

Nitrogen use efficiency

Reserve mobilisation

Yield

URI

https://oskar-bordeaux.fr/handle/20.500.12278/171910

DOI

http://dx.doi.org/10.1111/ajgw.12532

Unités de recherche

Ecophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287

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Nitrogen dynamics and fertilisation use efficiency: carry-over effect of crop limitation

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Résumé en anglais

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