Water-use efficiency

Increases in water-use efficiency are commonly cited as a response mechanism of plants to moderate to severe soil water deficits and has been the focus of many programs that seek to increase crop tolerance of drought. However, there is some question as to the benefit of an increased water-use efficiency of plants in agricultural systems, as the pr...
Found on http://en.wikipedia.org/wiki/Water-use_efficiency

water-use efficiency

A measure of the amount of water used by plants per unit of plant material produced. The term can be applied at the leaf, whole-plant, and ecosystem levels. At the leaf level, it is more precisely referred to as the instantaneous transpiration efficiency, the CO2 assimilation rate (photosynthesis) divided by the transpiration rate (the moles of CO2...
Found on http://cdiac.ornl.gov/glossary.html
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