دورية أكاديمية
Leaf-to-fruit ratio affects the impact of foliar-applied nitrogen on N accumulation in the grape must
| العنوان: | Leaf-to-fruit ratio affects the impact of foliar-applied nitrogen on N accumulation in the grape must |
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| المؤلفون: | Thibaut Verdenal, Jorge E. Spangenberg, Vivian Zufferey, Fabrice Lorenzini, Agnes Dienes, Katia Gindro, Jean-Laurent Spring, Olivier Viret |
| المصدر: | OENO One, Vol 50, Iss 1, Pp 23-33 (2016) |
| بيانات النشر: | International Viticulture and Enology Society, 2016. |
| سنة النشر: | 2016 |
| المجموعة: | LCC:Agriculture LCC:Botany |
| مصطلحات موضوعية: | grapevine, foliar urea, 15N-labelling, yeast assimilable nitrogen, Agriculture, Botany, QK1-989 |
| 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 |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2494-1271 |
| العلاقة: | https://oeno-one.eu/article/view/55Test; https://doaj.org/toc/2494-1271Test |
| DOI: | 10.20870/oeno-one.2016.50.1.55 |
| الوصول الحر: | https://doaj.org/article/5439d43268d44fd4b363cd49929fd934Test |
| رقم الانضمام: | edsdoj.5439d43268d44fd4b363cd49929fd934 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 24941271 |
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| DOI: | 10.20870/oeno-one.2016.50.1.55 |