共 8 条
[1]
APPLEMAN MD, 1946, J AM SOC AGRON, V38, P545
[2]
EMMERT EM, 1934, KY AGR EXPT STA CIRC, V43, P25
[3]
FOSTER AC, 1951, USDA CIRC, V862
[4]
GOLDSWORTHY MC, 1949, PLANT DIS REPTR, V32, P437
[6]
Morgan M. F., 1941, Bulletin. Connecticut Agricultural Experiment Station, P579
[7]
SHIVE JW, 1948, NJ AGR EXPT STA B, V636
[8]
STEENBERG B, 1944, UPPSALA ALMQVIST WIK