| Autor: |
Xu Di, Fang Shuxing, Yang Jian-guo, Wang ShaoLi |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB Proceedings, 13-16 June 2010, Québec City Convention Centre, Quebec City, Canada. |
| DOI: |
10.13031/2013.32113 |
| Popis: |
Taking five drainage reuse sites in Yinbei irrigation districts, Ningxia for example, this paper analyzed the chemical characteristics of drainage water in ditches, saline-alkaline hazard and its impact of drainage reuse on soil. The result showed that the hydro-chemical type of drainage water is CNa at Nuanquan farm and ClNa at other four pilots. Every alkaline index in the drainage water was obviously smaller during the middle-late irrigation than those during the early irrigation. Except Qianjin Farm, the saline-alkaline hazard of drainage reuse for irrigation was relatively slight. The dominant soluble salt in the soil was the Chloride-sulfate bearing sodium and calcium. The soil texture had an obvious impact on soil saline-alkaline after irrigation. Salt was not easy to accumulate the lightly textured soils, such as sandy loam. 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 systems 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. The effects of drainage reuse for irrigation were good. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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