共 10 条
[1]
BOYD F. T., 1938, JOUR AMER SOC AGRON, V30, P569
[2]
BURNS J. C., 1964, AGRON J, V56, P457
[3]
Dowell CT, 1919, J AGRIC RES, V16, P0175
[4]
FRANCIS CK, 1915, 38 OKL AGR EXP STA C
[5]
FRANZKE CJ, 1939, 1 SOUTH DAK AGR EXP
[6]
HARRINGTON JD, 1966, 735 PENNS AGR EXP ST
[7]
MANGES JD, 1935, VET MED, V30, P347
[8]
PETERS AT, 1903, 77 NEBR AGR EXP STA
[9]
SWANSON CO, 1921, J AM SOC AGRON, V13, P33
[10]
Willaman JJ, 1917, J BIOL CHEM, V29, P37