Soil evaporation for summer maize under no-tillage with straw mulching
ZHAO Xiujin1, ZHANG Zhitao2, ZHANG Zhaolu3, MA Yanfei3, WU Zhongdong3
1.Institute of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049, China; 2.Shandong Yitong Real Estate Appraisal and Mapping Co.Ltd., Jinan, Shandong 250100, China; 3.Institute of Resources and Environment Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
Abstract：To improve the utilization efficiency of rainfall in North China, micro-lysimeters(MLS)were selected to measure soil evaporation(E)of summer maize with and without straw mulching and combined with soil moisture to estimate evapotranspiration(ET).The seasonal dynamics of E over the field and the ratio of E to ET were studied. The results showed that soil evaporation of summer maize with straw mulching was reduced by an average of 39.5% compared with CK, and there was significant difference. The change trend of accumulatve evaporation capacity and time was in line with the power function model, and the fitting correlation coefficient reached 0.99. Straw mulched and no mulch treatment E/ET were about 33.5% and 41%. The correlation coefficients of evapotranspiration of straw mulched and no mulch treatments under the condition of evaporation and leaf area index were respectively 0.70 and 0.85. The total rainfall in North China and the coverage of basic water consumption were about the same, but the control appeared stage water shortage. The study reflects the advantage of no-tillage with mulching agricultural water conservation technique, and offers a theoretical basis for water-saving agriculture.
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