1. Most Probable Number Method for Microbial Population. Methods of Soil Analysis, Part 2. Chemical and Microbiological Properties-Agronomy Monograph No.9;Alexander,1982
2. Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements;Allen,1998
3. Standard Methods for the Examination of Water and Wastewater,2005
4. Residual contamination of crops irrigated with effluent of different qualities: a field study;Armon;Water Sci. Technol.,1994
5. Water Quality for Agriculture. FAO Irrigation and Drainage Paper 29;Ayers,1991