General irrigation efficiency for field water management |
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| Affiliation: | 1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 Xingang Xilu, Guangzhou 510301, China;2. School of Geographical Sciences, Guangzhou University, 230 Waihuan Xilu Xiaoguwei, Guangzhou Universities Town Campus, Guangzhou 510006, China;3. College of Biological Sciences, University of California Davis, Davis, One Shields Avenue, CA 95616, USA;1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | On-farm water management systems are traditionally evaluated using a set of performance indices which are inconvenient for evaluation and comparison. We propose a general efficiency (Eg) which is defined as the ratio of crop transpiration to the sum of the volume of applied water and the volume of deficit. Eg combines the characteristics of traditionally used irrigation efficiencies: application efficiency (Ea), storage efficiency (Es) and the Christiansen's coefficient of uniformity (Uc). Thus, it is possible to compare the performance of different water application systems and/or design and management scenarios using a single index. The relationships of Eg vs. Ea, Es and Uc are also presented using a transpiration fraction (α) which is defined as the ratio of transpiration to evapotranspiration. |
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