التفاصيل البيبلوغرافية
| العنوان: |
Leaf-to-fruit ratio affects the impact of foliar-applied nitrogen on N accumulation in the grape must |
| المؤلفون: |
Verdenal, Thibaut, Spangenberg, Jorge E., Zufferey, Vivian, Lorenzini, Fabrice, Dienes, Agnes, Gindro, Katia, Spring, Jean-Laurent, Viret, Olivier |
| المصدر: |
OENO One; Vol. 50 No. 1 (2016): Journal international des sciences de la vigne et du vin; 23-33 ; OENO One; Vol. 50 No 1 (2016): Journal international des sciences de la vigne et du vin; 23-33 ; 2494-1271 |
| بيانات النشر: |
International Viticulture and Enology Society - IVES |
| سنة النشر: |
2016 |
| مصطلحات موضوعية: |
grapevine, foliar urea, 15N-labelling, yeast assimilable nitrogen |
| الوصف: |
Aims: Agroscope investigated the impact of the leaf-to-fruit ratio on nitrogen (N) partitioning in grapevine following a foliar urea application with the aim of increasing the yeast assimilable nitrogen (YAN) concentration in the must. Methods and results: Foliar urea was applied to field-grown Vitis vinifera L. cv. Chasselas grapevines as part of a split-plot trial with two variable parameters: canopy height (90 or 150 cm) and fruit load (5 or 10 clusters per vine). Foliar application of 20 kg/ha of 15N-labelled urea (10 atom% 15N) was performed at veraison. The isotope labelling method allowed to observe foliar-N partitioning in the plant at harvest. The leaf-to-fruit ratio varied between 0.4 and 1.6 m2/kg, and strongly impacted the N partitioning in the grapevines. Total N and foliar-N partitioning was mainly affected by the variation of canopy height. The YAN concentration varied from 143 to 230 mg/L (+60 %) depending on the leaf area. An oversized canopy (+31 %DW) induced a decrease in the total N concentration of all organs (-17 %), and a decrease in YAN quantity in the must in particular (-53 %). A negative correlation between the N concentration and the carbon isotope discrimination (CID) could be pointed out in a condition of no water restriction (e.g., R2 = 0.65 in the must).Conclusion: An excessive leaf area can induce YAN deficiency in the must. Thus, a balanced leaf-to-fruit ratio – between 1 and 1.2 m2/kg – should be maintained to guarantee grape maturity, YAN accumulation in the must and N recovery in the reserve organs. Significance and impact of the study: The results of this study encourage further research to understand the role of other physiological parameters that affect N partitioning in the grapevine – YAN accumulation in the must in particular – and add new perspectives for N management practices in the vineyard. |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
text/html; application/pdf |
| اللغة: |
English |
| العلاقة: |
https://oeno-one.eu/article/view/55/htmlTest; https://oeno-one.eu/article/view/55/pdfTest; https://oeno-one.eu/article/view/55Test |
| الإتاحة: |
https://oeno-one.eu/article/view/55Test |
| حقوق: |
(c) Tous droits réservés OENO One 2016 |
| رقم الانضمام: |
edsbas.7577A050 |
| قاعدة البيانات: |
BASE |
