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Some Problems of Irrigation Water Management in Lower Cheliff Plain （Algeria）

Journal of Environmental Science and Engineering(A) 2012年第3期1卷 271-278页

作者： Abdelhamid BradaI Abdelkader Douaoui tarik hartani Water and Environment Laboratory Agricultural Sciences Institute Chlef University Chief02000 Algeria Agricultural Production and Durable Safeguarding of the Natural Resource Laboratory Earth Sciences Institute Khemis MilianaUniversity Khemis Miliana 44225 Algeria National School of Agronomic Sciences （ENSA） El Herrach 16200 Algiers Algeria

In the Lower Cheliff Plain （northwestern of Algeria）, the waters resources are limited; the adoption of a rational approach in the management of irrigation water in the irrigated perimeter poses an inequality in the balance between supply and demand. The two surface water resources, Gargar and Merdjet Sidi Abed dams, do not satisfy the requirements of agriculture water. According to the National Office of the Irrigation and Drainage data, the quantity of allocated water is never distributed; the difference between allocated water and drop water can also exceed 20%, and then, another problem of management is that the water losses in the distribution can reach 20% again. The shortage irrigation water resource allocated has constrained the farmers to use groundwater. The chemical analysis of 56 simples to this water showed a significant chemical diversity in the compositions. There is a high salinity risk （C3 class） or very high risk （C4 class） of soil salinisation. A space chart distribution to the EC water probability to exceed 2.25 dS/m interpolated by the indicator kriging method showed that 78% of the groundwater surface presents a significant probability to exceed this limit. The average value of the SAR （sodium adsorption ratio） is lower than 10 that indicates a moderate risk of sodisation. This observation is in contradiction with the high values of the SAR measured in the soil solution. The approach of residual alkalinity （RSC） shows that a good number of drillings analyzed presents a positive sign RSC （RSC 〉 0）. This water presents a real danger of sodisation. They have a low salinity, which, for a farmer, does not present any danger.

关键词： Management water irrigation groundwater water quality.

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Exploring Salinity Perception in Lower Cheliff Plain （Algeria）

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Journal of Agricultural Science and Technology(A) 2012年第11期2卷 1253-1259页

作者： tarik hartani Abdelhamid Brada Abdelkader Douaoui Agricultural Water Management Laboratory National High School of Agronomy (ENSA) Algiers 16200 Algeria Water and Environment Laboratory Agricultural Sciences Institute Chief University Chief02000 Algeria Agricultural Production and Durable Safeguarding of the Natural Resource Laboratory Earth Sciences Institute Khemis Miliana44225 Algeria

Salinity is a well known phenomenon throughout the agricultural fields of Algeria, where irrigation uses poor quality waters. This paper describes the results of a survey of farmers＇ perception of salinity with regard to salinity assessment. In the lower Cheliff plain, 42 farmers were interviewed using semi-structured questionnaires, and simultaneously, water and soil＇s salinity were measured in the laboratory. The results from this sample analysis were compared to the farmers＇ individual opinion on soil and water salinity. Conclusions point to a positive agreement between the two approaches because farmers are familiar with techniques and strategies to mitigate salinity effects. However, they do not perceive the risk of newly changing irrigation water source, which open up to soil degradation hazard.

关键词： Perception soil crops water salinity interview.

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