干旱区生态环境知识资源中心

The relationship between crop ET(Evapotranspiration) and yield is the theory base of agricultural irrigation management. Research on the interval amount of suitable crop ET is the most important headline of irrigation planning and water resources allocation. This paper, on the basis of previous field research works, taking winter wheat as an example, firstly analyzed the rule of crop water consumption during the whole growing stage and the relationship between ET and biomass, water productivity. Then, the relationship models of ET-biomass and ET-water productivity at the whole growing stage were established in Beijing by using remote-sensing ET and biomass, and the suitable water consumption interval for the winter wheat under the condition of non-sufficient irrigation was deduced[300mm, 408mm]. At the last, the application characteristics and the main influences on the models were discussed. The paper provides scientific basis and reference for further research on improving crop water productivity and yield under the condition of non-sufficient irrigation in Northern semi-arid region.