共 25 条
[1]
BIGGAR JW, 1969, EUTROPHICATION CAUSE, P405
[2]
BOULDIN DR, 1971, AGR WASTES PRINCIPLE, P25
[4]
CAMPBELL FR, 1969, J SOIL WATER CONSERV, V24, P139
[5]
COOTE DR, 1977, CAN AGR ENG, V19, P116
[7]
Frank R., 1977, LAND USE ACTIVITIES
[8]
GILLHAM RW, 1978, STUDIES AGR CONTRIBU