共 14 条
[1]
Beaumont AB, 1935, J AGRIC RES, V50, P0553
[4]
GALLAGHER P. H., 1942, Proceedings of the Royal Irish Academy, V47B, P205
[5]
Garner WW, 1923, J AGRIC RES, V23, P0027
[6]
KNOBLAUCH H. C., 1934, JOUR AMER SOC AGRON, V26, P609
[7]
McMURTREY J. E., 1929, JOUR AMER SOC AGRON, V21, P142
[8]
MORGAN MF, 1939, 127 CONN AGR EXP STA
[9]
PARBERY N. H., 1937, Agricultural Gazette of New South Wales, V58, P556
[10]
TAYLOR E. M., 1937, Scientific Agriculture, V17, P294