共 18 条
[1]
APP BA, 1972, AGRONOMY, V15, P527
[3]
BURTON GW, 1963, 20TH SO PAST FOR CRO, P11
[7]
GOERING TW, 1970, USDA HDB, V379
[8]
HUTCHINS SH, 1988, IC433 IOW COOP EXT S
[9]
JOHNSTON A, 1975, AGR CAN PUBL, V1536