Fig. 1
From: Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture
Volumetric soil water content (θv) versus soil water potential (Ψsoil) of soil from 3 locations (45 m apart) and 3 depths, plotted with the retention curves. Filled symbols are data points measured using a pressure chamber, non-filled symbols are those measured by means of a dew point potentiometer. The bottom right graph shows all the retention curves together and the average retention curve which was calculated from all data combined, the confidence interval based on the highest and lowest retention curve values for a given θv is indicated in black dashed lines