Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation
Détails
Télécharger: Verdenal et al_2022_ajgw_Nitrogen dynamics and fertilisation use efficiency carry‐over effect of crop.pdf (2208.08 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_CC08F9797D43
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Nitrogen dynamics and fertilisation use efficiency: carry‐over effect of crop limitation
Périodique
Australian Journal of Grape and Wine Research
ISSN
1322-7130
1755-0238
1755-0238
Statut éditorial
Publié
Date de publication
07/2022
Peer-reviewed
Oui
Volume
28
Numéro
3
Pages
358-373
Langue
anglais
Résumé
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.
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.
Mots-clé
15N isotope labelling, amino acids, foliar urea, nitrogen use efficiency, reserve mobilisation, yield
Web of science
Site de l'éditeur
Open Access
Oui
Création de la notice
23/11/2023 10:37
Dernière modification de la notice
06/03/2024 8:27