Diurnal and Seasonal Soil Water Uptake and Flux within a Bermudagrass Root Zone

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Abstract
Diurnal water movement within a bermudagrass [Cynodon dactylon (L.) Pers.] root zone and the uptake of water by the roots was studied in a field plot. A fast response tensiometer‐pressure‐transducer system was used to measure the hydraulic heads. The relations of pressure head to water content and to hydraulic conductivity were determined in situ. Diurnal water content and soil water flux profiles were derived by using the established hydraulic properties. The fast response tensiometer system enabled calculation of flux and water content changes over 2‐hour intervals. Diurnal water extraction rates calculated for different depths and times during the growing season yielded evapotranspiration rates that agreed well with rates measured on similar days in previous years using a lysimeter.

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