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| DOI： |
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| Effect of Irrigation on Dynamics of Soil Water and Water Use Efficiency under Double-cropped Winter Wheat-Summer Maize |
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GUO Zifeng , GONG Daozhi , HAO Weiping , MEI Xurong , YAN Yongluan , LIU Lin , LI Yuqin , ZHANG Wenying , LIU Binhui
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Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Dry Farming Institute, Hebei Academy Agricultural and Forestry Sciences, Hengshui 053000, China
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| Abstract: |
| Two wheat genotypes and two maize genotypes in different drought tolerance were screeded to study the dynamic change of soil water and water use efficiency(WUE) by designing different irrigation treatments. The two years experiment results showed that the infiltration was a slow process, substantially in a period of 1 year. In the growth period of winter wheat, the soil water content in the 0～60 cm changed greatly. It was the main reason that the water below 60 cm soil couldn’t be used by the summer maize resulted in the low irrigation efficiency. Through the analysis of winter WUE, the WUE increased with increasing irrigation frequency for drought resistant and water saving genotypes. Contrary to the drought sensitive genotypes. The yield changed little and the water consumption decreased for the drought resistant and water saving genotypes in the water deficit that WUE increased. Therefore, the selection of drought resistant and water saving wheat, moderate reduction of irrigation frequency, could reduce invalid irrigation infiltration, without affecting the production, it could also improve the water use efficiency in the North China plain. |
| Key words: winter wheat; summer maize; irrigation; dynamics of soil water; water use efficiency |
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