共 19 条
[2]
DYLLA AS, 1975, U MINNESOTA AGRIC EX, V133
[6]
HERGERT GW, 1978, 1978 U NEBR AGR DEP
[7]
HERGERT GW, 1980, AM SOC AGRON SPECIAL, V38, P89
[9]
Keeney D. R., 1980, ASA Special Publication, P33
[10]
KVIEN C, 1975, THESIS SO ILLINOIS U