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| Experiment on soil evaporation of summer maize in furrow irrigation |
| LIU Xiaofei1,2, FEI Liangjun1, SUN Jingsheng2, ZHANG Jiyang2, WANG Shunsheng3 |
| 1.Water Resources Institute, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2.Key Laboratory of Crop Water Requirement and Regulation of Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, He′nan 453003, China; 3.School of Water Conservancy, North China University of Water Conservancy and Electric Power, Zhengzhou, Henan 450011, China |
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Abstract In order to explore the law of the soil evaporation in summer maize farmland under furrow irrigaton, the experiment on the evaporation capacity of summer maize farmland soil and that of ridge and ditch under different furrow irrigation controlling lower limits was conducted. The results showed that the evaporation capacity of summer maize farmland soil reduced with the decrease of soil moisture. Soil evaporation took up a great proportion before the jointing stage in the whole growth period. Soil evaporation capacity at the seedling stage and the jointing stage accounted for 90% and 40% or so in the transpiration capacity respectively. The linear regression equation for the evaporation of ridge and ditch under different water treatments was fitted, the correlation coefficients were over 0.8,and finally soil evaporation after an irrigation after the heading stage and at the seedling stage of summer maize was compared,both of soil evaporation had a decreasing tendency with the lapse of time. The evaporation ratio of ridge to ditch was maintained at about 20:13,which will provide a reference for soil water cycle simulation of summer maize farmland under furrow irrigation. In farmland evaporation of summer maize under furrow irrigation, soil evaporation capacity should be controlled before the jointing stage in order to save water.
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Received: 01 December 2014
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