IRRIGATION WITH SEWAGE AND URBAN HOUSEHOLD EFFLUENT

摘要

One of the important factors that limit agricultural development and sustainability of fariabrn(irrigated) lands is the lack of adequate fresh water. In this condition, one may use poorrnquality domestic or sewage effluent, after suitable treatment or by mixing it with fresh waterrnso that the quality of the mixed water is of permissible standard for irrigation. In using sewagernwater, there is little information on the effect of its long-term use on soil properties and onrnthe agricultural produce. In estimating the quality of well water and filtered sewage water andrnfor judging its suitability for irrigation, the published standards of the Food and AgriculturernOrganization (FAO) have been used. Sewage effluent contains nutrients that are useful forrnthe plants in increasing their productivity. The sewage has about 21% organic matter, whichrnhas an effect on soil physical and chemical and hence on growth and performance of plant.rnLand irrigated by well water showed higher nitrogen content in the soil at the beginning ofrnthe plant growth stage but towards the final stages of the plant growth, the nitrogen contentrnin the soil was higher when the land was irrigated by sewage effluent.