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We compared seasonal changes in maximum diurnal trunk shrinkage (MDS) with seasonal changes in midday stem water potential (Ψ s ) over three years in plum trees grown in differing drip-irrigated regimes. In well-irrigated trees, day-to-day variations in Ψ s  and MDS were related to evaporative demand. Reference equations were obtained to predict MDS and Ψ s  values for well-irrigated trees as functions of environmental conditions. A decrease in plant water status toward the end of the growing season occurred even in the well-irrigated trees, probably reflecting a reduced volume of soil wetted by the drip irrigation system. Thus, for the prediction of Ψ s , different reference equations are required for the fruit-growth and after-harvest phenological periods. A seasonal change in the relationhip between MDS and Ψ s  was observed, which compensated for the decrease in plant water status such that well-irrigated trees had similar MDS values during both the fruit-growth and after-harvest periods.

Usefulness of diurnal trunk shrinkage as a water stress indicator in plum trees