Continuous trunk diameter recording can reveal water stress in peach trees

Abstract

A study conducted on 8-year-old peach cv. O'Henry trees at the Kearney Agricultural Center, Parlier, California (USA) showed that continuous monitoring of trunk diameter can be an accurate technique of detecting water stress (as well as the traditional method of measuring predawn or midday leaf water potential or midday stem water potential). The trees were evaluated during 21 days of deficit irrigation followed by 17 days of full irrigation. Trunk-based measurements were generally more sensitive than discrete measurements to both the onset of water stress and the magnitude of tree water deficits. Parameters based on trunk diameter monitoring correlated well with established physiological parameters of plant water status. These trunk diameter oscillations, which are only available from continuous monitoring, hold promise for improving the precision of irrigation decision making. Record - 137