1. Brady, N.C., 1974. The Nature and Properties of Soils, 8th ed. MacMillan, New York
2. Brakensiek, D.L., Osborn, H.B., Rawls, W.J. (Coordinators), 1979. Field manual for research in agricultural hydrology. USDA AH224. U.S. Govt. Print. Office, Washington, DC
3. Nutrient transport in surface runoff as influenced by soil cover and seasonal periods;Burwell;Soil Sci. Soc. Am. Proc.,1975
4. Nitrate leaching from a small, underdrained, grassland clay catchment;Haigh;Soil Use and Manag.,1986
5. Leaching losses of major nutrients from a mole-drained soil under pasture;Heng;New Zealand J. Agric. Res.,1991