Fig. 2
From: Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture
Predawn leaf water potential (Ψpd) of 30 grape cultivars as a function of A: the relative extractable soil water (θe, Eq. 4), and B: the soil water potential (Ψsoil). The legend indicates the number of the dry down cycle and the year in which the measurements were done. The solid line indicates the average retention curve, and the dashed lines indicate the maximal and minimal retention curves. The linear trendlines are shown for the data combined for each season