共 8 条
[1]
Knowles R. P., 1943, SCI AGRIC [OTTAWA], V24, P29
[2]
ANATOMICAL STRUCTURE OF THE ALFALFA FLOWER AND AN EXPLANATION OF THE TRIPPING MECHANISM
[J].
BOTANICAL GAZETTE,
1954, 116 (01)
:40-52
[3]
MARCUS R, 1957, AGRON J, V49, P604
[4]
NIELSEN HM, 1962, 1 P INT S POLL COP
[6]
ROTAR PP, 1963, 209 RES B NEBR AGR E
[7]
Stevenson T. M., 1947, EMPIRE JOUR EXPTL AGRIC, V15, P82