Leaf surface and nitrogen supply in grapevine plants: Observations on Chasselas and Pinot noir vines | Expression vegetative et alimentation azotee de la vigne. Observations sur Chasselas et Pinot noir
2007
Spring, J.-L. | Zufferey, V., Station de recherche Agroscope Changins-Waedenswil ACW, Pully (Switzerland). Centre viticole du Caudoz
Experimental trials on Chasselas and Pinot noir vines were set up on the estate of the Agroscope Changins-Wädenswil Research Station at Pully, Vaud (Switzerland), in order to study the interaction between plant outgrowths and nitrogen supply in grapevines. Significant differences in leaf surface were obtained either by eliminating lateral buds or by varying the height of hedgerows. It became evident that nitrogen content in leaves at the time of fruit ripening and in musts at harvesting, as well as leaf chlorophyll content, were negatively correlated with an increase in vine plant outgrowth (total leaf surface). By exceptional climatic conditions or in situations where nitrogen supply may be restrictive, excessive leaf surface can increase nitrogen competition problems with possible repercussions on wine quality.
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