1Vervoot R W, Radcliffe D E, Cabrera M L, et al. Nutrient losses in surface and subsurface flow fron pasture applied poultry litter and composted poultry litter. Nutrient Cycling in Agroecosystems, 1998, 50:287 - 290.
3Fleming R J, Bradshwa S H, Contamination of subsur faced rainge system during manure spreading, ASAE, StjosephM1, 92 -- 2618.
4Evans P O, Westerman P W, Overcash M R, Water quality from land application of seine lagoon effluent, Trans ASAE, 1984, 27(2): 437 - 480.
5Adams P L, Daniel T, Edwards D, Poultry litter and manure contribution to nitrate leaching through the vadose zone, Soilsci. Soc. Sm.J, 1994, 58(4): 1206 - 1211.
6Henning S, Pierre G, Tom W, et al. Livestock's long sha- dow: environment issues and options. Food and Agricul- ture Organization of the United Nations, 2006.