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Microenvironmental conditions in a shadehouse covered with shade fabric designed to exclude 70% of incoming light were monitored and compared to those in an adjacent field to quantify differences related to plant water use. Radiant flux density and photosynthetic, photon flux inside the shadehouse varied seasonally between about 18% to 28% of outside values. During the day, leaf and air temperatures around the crop canopy were generally lower and relative humidities higher inside the shadehouse than outside. Leaf-to-air vapor pressure gradients inside the shadehouse averaged about half those outside. Wind run inside was &lt;10% of wind run outside. Differences between reference ET (ET o ) values, calculated using Penman's equation), inside and outside the shadehouse were greatest during summer months. Outside evaporatory pan (E pan ) water losses ranged from 205 mm in July to 95 mm in Nov. For the same months, E pan  losses inside were about 80% lower. Monthly ET actual , as determined for  Rumohra adiantiformis  growing in lysimeters in the shadehouse, ranged from around 40% to 80% of inside E o .

510 PB 260 COMPARISON OF FIELD AND SHADEHOUSE MICROCLIMATE FACTORS RELATED TO EVAPORATION AND CROP TRANSPIRATION