共 22 条
[11]
MACDONALD JM, 2007, AMBER WAVES, V5
[12]
*NASS, 2009, QUICK STAT DAT
[13]
Onyiro OM, 2008, J DAIRY SCI, V91, P322, DOI 10.3168/jds.2007-0514
[14]
OSTROM MR, 2000, 8 PATS U WISC EXT
[15]
Paine L. K., 2000, Journal of Natural Resources and Life Sciences Education, V29, P60
[16]
Parker W.J., 1993, Prof. Anim. Sci, V9, P159
[17]
Grassland birds associated with agricultural riparian practices in southwestern Wisconsin
[J].
JOURNAL OF RANGE MANAGEMENT,
2001, 54 (05)
:546-552
[18]
Sharpley A.N., 1999, Managing phosphorus for agriculture and the environment
[20]
Winsten J. R., 2000, Agricultural and Resource Economics Review, V29, P220