Moisture Movement and Transformation Law under Soil Moisture Conserving Irrigation in Winter Wheat Field

[Objective] The aim was to provide theoretical basis for field moisture conserving irrigation. [Method] With Xiaoyan No.6 as tested material,three different kinds of mulching irrigation treatments were carried out (straw mulching; plastic mulching; PAM control adjustment mulching). With non- mulching treatment as control,moisture conserving effect of different treatments were compared. [Result] The results showed that the water consumption of winter wheat under different soil moisture conservation treatments was low at earlier stage and later stage,but high at mid-stage,which was consistent with the water consumption law of control. There were some differences in terms of consumption intensity because of irrigation schedule and growth condition; soil moisture conservation treatments could restrain ineffective evaporation of soil moisture before anthesis. We also found that the variation of soil moisture at depth of 0-20 cm in PAM and control treatment was dramatic. The soil moisture of the former was lower than the latter at the depth of 0-20 cm,but higher at the depth of 20-50 cm. The difference of soil moisture at the depth of 0-50 cm was significant. [Conclusion] Plastic mulching and straw mulching could restrain evaporation effectively.