Abstract
The purpose of this paper is to investigate the feasibility of predicting leaf water potential before sunrise (ψmax) from the potential during 13:00-14:00 (ψmin) and of obtaining an index accounting for fluctuations of ψmin in Satsuma mandarin (Citrus unshiu MARC.) trees. We were unable to find an indicator accounting for the fluctuations of c min under various environmental conditions. However, our data suggested a possibility of estimating ψmax from the leaf water potential at about 19:00. ψmax for trees on the soil of similar properties could also be estimated from ψmin/VPD where VPD is vapor pressure deficit.
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