1. APHA-AWWA-WEF. 1995. Standard methods for the examination of water and wastewater. 19th ed. American Public Health Association, Washington, USA.
2. Interaction of orthophosphate with soil;Beek,1982
3. BS 1377: Part 3: 1990. Determination of the pH value. British standard method of test for soils for civil engineering purposes. Part 3. Chemical and electro-chemical tests.
4. Environmental pressures and national environmental legisation with respect to nutrient management;Carton,2001
5. Water quality improvement of treated wastewater by intermittent soil percolation;Castillo;Water Sci. Technol.,2001