Experimental investigation into effects of maize leaf and straw fragments on soil water infiltration characteristics in furrow irrigation
ZHENG Jian1,3, WANG Yan1,3, CAI Huanjie2, ZHANG Enji1,3, SUN Yuxin1,3
1.China Western Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou, Gansu 730050, China
To clarify effects of straw fragments on soil water infiltration characteristics and water content distribution in the soil in furrow irrigation, a series of experiments are carried out in laboratory by using maize leaf and straw fragments with different sizes, proportions and depths buried. In addition, the wetting front movement of soil water in different treatments is simulated with the software of HYDRUS-2D. The results show that soil water infiltration rate is decreased in the cases with maize leaf fragments, but increased in the cases with maize straw fragments significantly. For the cases with maize straw fragments, the soil vertical infiltration distance is increased if the fragments are buried in a depth of 10-15 cm, and the vertical distance of 18% soil water content contours is greater than that if the fragments are buried in 5-10 cm depth. In the cases with maize leaf fragments, the horizontal distance of 18% soil water content contours is increased when the fragments are buried in 10-15 cm depth compared with 5-10 cm depth. In the case that the soil is blended with 3% maize leaves in 10-15 cm depth, the maximum soil water content can be as high as 21%, and the vertical infiltration distance is the shortest. This implies that in this treatment the water movement in the vertical direction has been obstructed effectively and the water content in the soil above the buried layer is increased simultaneously. Meanwhile, the error of wetting front movement between experiment and simulation of HYDRUS-2D is less than 3%, suggesting the software demonstrate the behavior of wetting front movement accurately.
ZHENG Jian-,,WANG Yan- et al. Experimental investigation into effects of maize leaf and straw fragments on soil water infiltration characteristics in furrow irrigation[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(1): 66-72.
ZHAO Shicheng, HE Ping, QIU Shaojun, et al. Long-term effects of potassium fertilization and straw return on soil potassium levels and crop yields in north-central China[J]. Field crops research, 2014,169:116-122.
WANG X H, YANG H S, LIU J, et al. Effects of ditch-buried straw return on soil organic carbon and rice yields in a rice—wheat rotation system[J]. Catena, 2015,127:56-63.
KUMAR A, KUMAR P, YADAV S K, et al. Effect of integrated nutrient management on yield and economics of pearlmillet-wheat cropping system[J]. Environment and ecology, 2012,30(1):57-59.
WANG Zengli, WANG Zhen, FENG Hao. Effects of pretreated straws on soil evaporation and straw decomposition rate[J]. Journal of drainage and irrigation machinery engineering, 2013,31(9):816-821.(in Chinese)
WANG Yan, ZHENG Jian, JI Hong, et al. Impacts of plant additive on the infiltration with sandy loam[J]. Transactions of the Chinese society for agricultural machinery, 2010,41(1):63-67.(in Chinese)
QIU Shaojun, JU Xiaotang, LU Xing, et al. Improved nitrogen management for an intensive winter wheat/summer maize double-cropping system[J]. Soil science society of america journal, 2012,76(1):286-297.
ABRO S A, TIAN Xiaohong, WANG Xudong, et al. Decomposition characteristics of maize(Zea mays. L.)straw with different carbon to nitrogen(C/N)ratios under various moisture regimes[J]. African journal of biotechnology, 2011,10(50):10149-10156.
ZHENG Jian, WANG Yan, CAI Huanjie, et al. Soil-water characteristic curves of soil with plant additive and analyses of the fitting models[J]. Transactions of the Chinese society for agricultural machinery, 2014,45(5):107-112.(in Chinese)