共 5 条
[1]
ERICKSON LC, 1948, J AM SOC AGRON, V40, P659
[2]
KLINGMAN DL, 1947, J AM SOC AGRON, V39, P445
[3]
MCNEAL FH, 1948, J AM SOC AGRON, V40, P1070
[5]
1945, 2ND P ANN M N CENTR