共 8 条
[1]
Fick G. N., 1975, North Dakota Farm Research, V32, P30
[2]
GRANLUND M, 1975, Proceedings of the North Dakota Academy of Science, V27, P128
[3]
JOHNSON BJ, 1972, AGRON J, V64, P747
[4]
Putt E. D., 1943, SCI AGRIC [OTTAWA], V23, P384
[5]
PUTT E. D., 1951, SCI AGRIC [OTTAWA], V31, P480