Advances in evaluation study on utility of agriculture water utilization

The key issue of agricultural water resources utilization(AWRU) is utility.It is significant to establish target system to evaluate the utility of AWRU for realizing the efficient and sustainable utilization of agricultural water resources.The methods and theories for evaluating the utility of AWRU are in process from water use efficiency to the combination of water use efficiency and benefit.Therefore the scale of evaluating the utility of AWRU is being transformed from micro-level of crop and field to the medium and macro-level of irrigation district,watershed,nation and globalization.The research of the evaluation of AWRU in the future will be focused on the establishment of the target system of AWRU which is based on the different water balance and the transformation and the scale effect at different scale.