共 15 条
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[2]
BIRD J. N., 1948, SCI AGRIC [OTTAWA], V28, P444
[3]
BULA R. J., 1965, CROP SCI, V5, P425
[4]
BULA R. J., 1964, CROP SCI, V4, P295, DOI 10.2135/cropsci1964.0011183X000400030017x
[5]
GARRISON CS, 1961, USDA YB AGR, P401
[6]
LAUDE HM, 1960, 8 INT GRASSL C, P180
[7]
LAUDE HORTON M., 1958, AGRON JOUR, V50, P223
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STANFORD E. H., 1962, CROP SCI, V2, P497, DOI 10.2135/cropsci1962.0011183X000200060017x
[10]
STEPPLER H. A., 1954, CANADIAN JOUR AGRIC SCI, V34, P222