6World Health Organzation.WHO (1989) Health guidelines for the use of wastewater in agriculture and aquaculture[Z].Technical Report Series,778.
7Pescod,M.B.(1992),Wastewater treatment and use in agriculture.F.A.O.Irrigation and Drainage pp47.Rome,Italy.
8Westcot,D.W.,1997.Quality Control of Wastewater for Irrigated Crop Production.FAO Water.Report 10,FAO,Rome.
9Shuval H I.The role of wastewater recycling and reuse in water resources management under condition of scarity.In proceed-ings of 8th International Water Resources Association World Congress on Water Resources,Carlo,Egypt,1994,1(6):6-19.
10F.Mapandaa,E.N.Mangwayanaa,J.Nyamangaraa,K.E.Giller.The effect of long-term irrigation using wastewater on heavy metal contents of soils under vegetables in Harare,Zimbabwe Agriculture,Ecosystems and Environment,2005,107,151-165.