1. Arkin, G.F., Ritchie, J.T., Thompson, M., and Chaison, R.: 1976, Agron. J.68, 429.
2. Bruce, R.R., and Shuman Jr., F.L.: 1962, Trans. ASAE 52, 212.
3. Chan, W.H., Tang, A.J.S. and Lusius, M.A.: 1983, Precipitation concentration and wet deposition fields of pollutants iOntario September 1980 to December 1981. Ontario Ministry of the Environment, API0S Report ARB-61-83-ARSP, Toronto, Canada. 79 p.
4. Evans, L.S., Lewin, K.F., Conway, C.A., and Patti., M.J.: 1981, New Phyt. 89, 459.
5. Heagle, A.S., Phibeck, R.B., Brewer, P.F., and Ferrell, R.E.: 1983, J. of Envir. Qual. 12, 538.