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Influence of potassium deficiency and temporary potassium deficiency on nitrogen metabolism in leaves and berries of wine grapes

First Paragraph: The aim of the proposed research was to study several sites with a history of potassium deficiency using a rapid screening procedure for putrescine levels that we developed in previous work on this project. The objective was to validate our screening procedure and provide recommendations regarding sampling time so that putrescine screening can be used routinely for managing potassium deficient vineyards.

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