共 4 条
[1]
ELLISON WD, 1950, LAND, V9, P487
[2]
SELECTIVE EROSION OF SOIL FERTILITY CONSTITUENTS
[J].
SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS,
1952, 16 (04)
:353-356
[3]
ROHLICH GA, UNPUB
[4]
STALLINGS J. H., 1951, BETTER CROPS WITH PLANT FOOD, V35, P21