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Published online by Cambridge University Press: 03 October 2008
The relations between plants and their water supplies are complex and there is no uniquely critical soil water deficit (i.e. no unique stage in the drying cycle at which growth and/or commercial yield begins to be significantly affected by increasing dryness of the soil). Evidence is presented that different deficits are ‘critical’ according to the type and depth of the soil, and the adequacy of nutritional supplies.