Linking the transpirable soil water content of a vineyard to predawn leaf water potential measurements

Author

Rémi Gaudin, Sébastien Roux and Bruno Tisseyre

Agricultural Water Management, 2017, vol. 182, issue C, pages 13-23

Abstract: A new expression of the time derivative of predawn leaf water potential was proposed by equalizing two expressions of the grapevine transpiration. This expression was established when transpiration is the only driver of the vineyard water balance. Under Mediterranean climate, this condition is met for long periods of drought i.e. most of the summer time under the hypothesis that there is no water movement (capillary rise) from the deep layers of the soil. The proposed approach showed that changes in predawn leaf water potential (Ψpd) values are in inverse relation with the Total Transpirable Soil Water (TTSW) which characterizes the maximal water stock of the soil and in direct relation with reference evapotranspiration (ETo) and the basal crop coefficient (kcb) of the vine. The relation between Ψpd changes and cumulated ETo is linear with a slope related to the ratio of “kcb to TTSW”. This ratio can be therefore estimated from field measurements and climatic data.

Keywords: Vitis vinifera L.; Soil water balance; Mediterranean vineyard; Water stress(search for similar items in EconPapers)
Date: 2017
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