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Estimating Crop Coefficients of Drip-irrigated Watermelons and Honeydew Melons from Pan Evaporation

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

Citation:  Paper number  032247,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13817) @2003
Authors:   Tingwu Lei, Juan Xiao, Guangyong Li, Yingduo Yu, Zhizhong Liu, Jianping Wang
Keywords:   Watermelon, Honeydew melon, Drip irrigation, Crop water requirement, Crop coefficients, Water requirement coefficients

Field drip irrigation experiments of watermelons and honeydew melons were conducted in Hetao region of Inner Mongolia, China with portable lysimeters. Crop water requirements of watermelons and honeydew melons, were estimated through water consumption of the crops under different water application, through field water balance theory. These water requirements of the crops were estimated from the water consumption that was most favorite for the crop growth. The Crop Coefficients Kc were computed based on the definition: the ratio of water requirement of crop to reference evapotranspiration. The evapotranspiration was estimated from the relation between the evaporation from US Class A Pan and the Reference Crop Evapotranspiration and the relation between the evaporation from US Class A Pan and that from the Chinese Evaporimeter . The crop water requirement coefficients based on Chinese Evaporimeter were estimated accordingly. A very simple empirical and readily applicable equation was developed to estimate crop coefficient with evaporation from Chinese Evaporimeter or that from US Class A Pan. The obtained parameters are very conveniently applicable to drip irrigation system design and management in regions of similar conditions.

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