Authors: WANG Shao-li 1, XU Di 1, YANG Jian-guo 2, FANG Shu-xing 3
1. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
2. Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
3. Hydrology bureau of Ningxia, Yinchuan 750004, China
Abstract: This paper analyzed the chemical characteristics of drainage water in ditches, saline-alkaline hazard and its impact of drainage reuse on soil in Yinbei irrigation districts, Ningxia. The result showed that the hydro-chemical type of drainage water is C Na at the Nuanquan Farm and ClNa at other four plots. Every alkaline index in drainage water was obviously smaller during the middle-late irrigation than those during the early irrigation. Except for the Qianjin Farm, the saline-alkaline hazard of drainage reuse for irrigation was relatively slight. The dominant soluble salt in soil was Chloride-sulfate bearing sodium and calcium. The soil texture had an obvious impact on soil saline-alkaline after irrigation. The lightly textured soil, such as sandy loam, was not easy to accumulate the salt. In the area where the rice was planted for a long term, the groundwater level was higher and the better choice was to adopt the paddy-upland rotation system in order to maintain the effect of soil improvement. Adopting rotation system with anti-saline crops, soil flushing with fresh water, paddy-upland rotation and so on would play an important role in controlling soil water-salt and improving the soil and the effects of drainage reuse for irrigation were good.
Key words: Drainage reuse for irrigation, Mineralization, Saline-alkaline, Chemical characteristics
Published in: Journal of Hydraulic Engineering, Vol. 42, No. 2, 2011
Article ID: 0559-9350 (2011) 02-0166-07
