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Development of Bahiagrass Crop Coefficient in a Humid Climate

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072151.(doi:10.13031/2013.22939)
Authors:   Xinhua Jia, Michael D Dukes, Jennifer M Jacobs
Keywords:   Evapotranspiration, crop coefficient, eddy correlation, bahiagrass

Bahiagrass (Paspalum notatum) crop coefficients (Kc) were determined for July 2003 through December 2006 in central Florida. The eddy correlation method was used to estimate crop evapotranspiration (ETc) rates. The standardized reference evapotranspiration (ETo) equation (ASCE-EWRI, 2005) was applied to calculate the ETo values using weather data on site. Daily Kc values were estimated from the ratio of the measured ETc and the calculated ETo. The Kc values determined by the eddy correlation method were similar to those determined in the same region by eddy correlation method and soil water balance method. Using the measured Kc values, the recommended monthly bahiagrass Kc values were as follows: 0.35 (Jan. – Feb.), 0.55 (Mar.), 0.80 (Apr.), 0.90 (May), 0.75 (Jun.), 0.70 (Jul. – Aug.), 0.75 (Sep.), 0.65 (Oct.), 0.60 (Nov.), and 0.45 (Dec.) in central Florida.

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