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•“Stress,” in the context of plants, is a broad term used to describe <br />some type of adversity that, if prolonged, can result in economic <br />yield loss (Jackson, 1982). <br />•“Water stress” then describes a condition where the supply of water <br />in plant leaves is insufficient to carry out photosynthesis and <br />respiration using all available energy. <br />•Under water stress conditions, a greater amount of available energy <br />must be converted to sensible heat compared with what would have <br />occurred for non-water-stressed conditions. The result is that the <br />temperature of the plant canopy increases over the temperature that <br />would have resulted for no shortages in water. <br /> <br />Crop Water Stress <br />4