6Adams P L,Daniel T C,Edwards D R,et al. Poultry Litter and Manure Contributions to Nitrate Leaching Through the Vadose Zone [J]. Soil Science Society of America Journal, 1994,58(4):1 206-1 211.
7Evanspo,Wester M P W,Overcash M R. Subsurface Drainage Water Quality from Land Application of Seine Lagoon Efflu- ent[J]. Transactions of the American Society of Agricultural and Biological Engineers, 1984,27(2) : 473-480.
