Abstract:

【Objective】 The objective of the experiment was to evaluate the evapotranspiration (ET) of winter wheat under sprinkler irrigation in Beijing area, which is useful to the field sprinkler irrigation management practices of winter wheat. 【Method】Field experiments were conducted in 2005-2008 growing seasons in an experimental station with different irrigation depths. 【Result】 Results indicated that variation of soil water content occurred within 0-40 cm soil layer. The seasonal ET of winter wheat generally increased with the increasing of irrigation amount, while the seasonal usage of soil water had a negative relationship with irrigation amount. Soil evaporation was about 25% of winter wheat ET during the period from reviving to maturity. Soil evaporation increased while the proportion of soil evaporation to ET decreased as the increase of irrigation amount. 【Conclusion】 Sprinkler irrigation scheduling with a relatively large irrigation quota and low irrigation frequency can reduce soil evaporation and promote irrigation water use efficiency.

Key words: sprinkler irrigation')">sprinkler irrigation, winter wheat, evapotranspiration, soil evaporation, soil water distribution