Abstract:In order to obtain the hydraulic characteristics of the fresh water drip irrigation in the red soil region and to make a scientific and rational basis for irrigation to improve the crop yield, based on the three-dimensional model test of wetting front migration of fresh water drip irrigation with single-point source, the wetting front migration of fresh water drip irrigation with double-point source was observed, and the wetting front migration process of single- and double-point source of drip irrigation under different soil bulk density and different dripper discharge were observed. The results showed that before the convergence, the horizontal wetting distance and the water content in the same position of the droplet increase as soil bulk density increases. The distance of the vertical wetting front increases with the increase of the dripper discharge, while the soil bulk density decreases. After the intersection, the convergence time of wetting area is moved up ahead with the increase of the dripper discharge and the decrease of bulk density, and the convergence width of the wetted area increases. The convergence time under the dripper discharge of 4.68 L/h is 146 s ahead of that under the dripper discharge of 3.74 L/h and the convergence width increases by 2.3 cm. The soil bulk density and the soil wetting width were increased, and the surface wetting ratio increases. The results are of some guidance significance for the application and popularization of drip irrigation in Yunnan red soil region with weak water-saving consciousness.
王卫华, 董丽艳, 杨惠芳. 淡水滴灌条件下红壤土水力特征[J]. 排灌机械工程学报, 2017, 35(8): 709-.
WANG Wei-Hua, DONG Li-Yan, YANG Hui-Fang. Hydraulic characteristics of red loam under drip irrigation with fresh water. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(8): 709-.