1. Ayers, R.S., Westcot, D.W., 1985. Water Quality for Agriculture, Food and Agriculture. Organization of the United Nations, Roma, p. 29.
2. Assessment of the contamination and genotoxicity of soils irrigated with wastewater;Chen;Plant Soil,2004
3. Toxicity and accumulation of chloride and sulphate salts in plants;Eaton;J. Agric. Res.,1942
4. FAO, 1973. Investigation and Feasibility Study of an Irrigation Project South of Lake Chad. Report by Sir M. MacDonald & Partners, London. Report No. AGL:SF/NIR/43, FAO, Rome.
5. Irrigation with Treated Sewage Effluents: Management for Environmental Protection;Feign,1991