|
Résumé :
|
Soils in arid and semi-arid areas often have a low-organic content. Consequently, there are needs for improvement of soil fertility. A way to solve this problem is to use sewage sludge in agriculture when other organic matter sources are lacking. This is what is being done in Tunisia where several hectares, particulary in the irrigated schemes, are already supplied with sewage sludge. Experiments were conducted, during two years, at the Cherfech agricultural field research station located 25 km north of Tunis, in the Lower Medjerda valley, on silty clay loam soils irrigated with brackish waters; the effect on the volume and quality of drainage waters of a heavy sewage sludge amendment has been compared to a mineral fertilizers applications. The results of these experiments are presented in this paper.
|
