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How to monitor crop water <br />stress? <br />•By measuring or estimating crop water use and comparing resulting <br />values to non-stress crop water use <br />•Crop water use = crop evapotranspiration = E + T = ET <br /> where: E = evaporation and T = transpiration <br />•ET = (Kcb Ks + Ke) ETref <br />•ET from a soil water balance (soil water sensors) <br />•ET from remote sensing sensors <br />•ET from micro-meteorological heat flux towers (e.g., EC) <br />•ET from lysimeters <br />•ET from plant heat balance or heat pulse techniques <br /> <br />5 P <br />a <br />ET <br />ETCWSI1