WU Feng1,2, WANG Haoyu3, ZAI Songmei2,3*, LIU Shengdong3, FENG Xuefang3
1. School of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China; 2. Henan Key Laboratory of Water-saving Agriculture, Zhengzhou, Henan 450046, China; 3. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China
Abstract：By taking the ditching parameters(depth, width )and backfill soil bulk density as the experimental factors, the orthogonal test of 3 factors and 3 levels were carried out in the laboratory in order to study the reasonable buried parameters of stalk composite pipe. The results show that the profile of the wet body is approximately a semi-elliptic under straw subsurface irrigation, where the short axis is the horizontal migration distance and the long axis represents the vertical migration distance. At a ditch depth of 20 cm, ditch width of 15 cm and backfill soil weight of 1.1 g/cm3, a maximum irrigation water storage rate pipe is obtained maximum. At a ditch depth of 10 cm, ditch width of 25 cm and backfill soil weight of 1.2 g/cm3, the largest water distribution uniformity is recorded. Also, the soil moisture ratio was the best at a ditch depth of 20 cm, ditch width of 25 cm, and a backfilled soil bulk density of 1.3 g/cm3. Considering the irrigation water storage rate, water distribution uniformity and soil moisture ratio of stalk composite pipe, it can be concluded that the irrigation effect is mostly affec-ted by the ditch depth. The irrigation effect of straw subsurface irrigation is better when at a ditch depth of 20 cm, ditch width of 25 cm, and soic bulk density of backfill soil weight of 1.3 g/cm3, that is, the position parameter appears more reasonable. The above conclusions can provide some reference for the rational arrangement of stalk composite pipes under straw subsurface irrigation.
