Abstract
ABSTRACT PLANT water stress development was evaluated relative to variables indicative of prevailing soil and atmospheric environments. Data were obtained for six crops grown on two soil types with differing hydraulic properties. Leaf xylem pressures were found best correlated with prevailing ambient air temperature and avail-able soil moisture level. For each crop-soil combination studied, regression relationships were developed to esti-mate allowable root zone moisture depletion relative to expected maxi-mum ambient air temperatures. When summarized over all data, allowable depletions were estimated to average 0, 18, 54, 81, and 93 percent at ambient air temperatures of 37.8, 32.2, 26.7, 21.1, and 15.6 C, respectively. Simulation tests also showed water balance methods with plant stress criteria can reduce annual irrigation requirements
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