Abstract:

In order to increase the efficiency of irrigation water, water use efficiency and economic efficiency, the effects of limited supplemental irrigation at different periods (stages) in different years on wheat yield, water use efficiency and water economic efficiency were analyzed in a random block design experiment in Linfen, Shanxi Province. The results showed that in normal and arid years, average wheat yield, water use efficiency and water economic efficiency of irrigation water under treatments at different growth periods were increase in the order of pre-winter irrigation > spring irrigation > late irrigation; Average yield and water economic efficiency of irrigation water under different irrigation treatments were affected in the order of winter water > booting water > jointing water > flowering water > green up water > standing water > filling water > the contrast (non-irrigation), water use efficiency was affected in the order of winter water > booting water > flowering water > green up water > standing water > jointing water > filling water > the contrast; Average yield and water efficiency under different irrigation treatments in normal rainfall years were higher than that of arid years, but the water economic efficiency of irrigation water was higher in arid years. Meanwhile, the study made clear soil water dynamic at different growth periods. It provided an important theoretical basis and technical support for developing semiarid land agriculture.