Abstract
The β-gauge is a useful instrument for monitoring changes in plant water status, and it has also been used to estimate absolute water status. The effects of plant parameters such as variability of leaves, lateral leaf shrinkage, growth and ontogenetic changes, on the use of the technique for water status estimation in cotton were examined. It was concluded that the method has limited utility for the estimation of absolute plant water status. In conjunction, however, with a parallel sampling technique which was developed, the method can be of value for following both long and short term changes in water status.
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