Effect of straw on soil evaporation of winter wheat
Hao Zhipeng1,2,3, Dong Qinge4,5, Feng Hao2,4, Wang Zikui1,2
1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Water Saving Agriculture in Arid Regions of China, Yangling, Shaanxi 712100, China; 3.Laiyang Water Conservancy Bureau, Laiyang, Shandong 370682, China; 4.National Engineering Research Center for Water Saving Irrigation at Yangling, Yangling, Shaanxi 712100, China; 5.University of Chinese Academy of Science, Beijing 100049, China
Abstract：Based on the data of two fertilization treatments in field experiments(matching use of straw and chemical fertilizer(S)and general chemical fertilizer(R)), soil evaporation, the correlation between the proportion of soil evaporation in evapotranspiration and leaf area index, together with the correlation between soil water content and leaf water content throughout the growing period of winter wheat, were compared and analyzed. The results show that, under both treatments of “S” and “R”, the soil evaporation of winter wheat during the whole growing period can be indicated with the changing law of “W”, i.e. “high-low-high-low-high”. Treatment method “S” could restrain the soil evaporation of winter wheat effectively, with averaging inhibition rate of evaporation 9.96% during the whole growing period, and the inhibition rate of evaporation can be indicated with the changing trend of “high-low-high-low” along with the growing period. Moreover, the leaf area index is much hi-gher, while the proportion of soil evaporation in evapotranspiration is much lower under the treatment method “S” than the treatment method “R”. So the treatment method “S” is beneficial to the leaf growth and can help to reduce the proportion of soil evaporation in evapotranspiration. After closing the row of winter wheat, the leaf water status of winter wheat could be understood by monitoring the water content of soil in depth of 40-60 cm and 60-80 cm.
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