共 4 条
[1]
BULA R. J., 1962, CROP SCL, V2, P156, DOI 10.2135/cropsci1962.0011183X000200020023x
[3]
KEHR WR, 1976, NEBR AGR EXP STA RES, V277
[4]
OSTAZESKI SA, 1984, USDA ARS MISC PUB, V1434, P21