共 16 条
[1]
BROWN HM, 1937, 187 MICH STAT COLL
[2]
BUFFUM BC, 1898, WYOMING AGR EXP STA, V37, P207
[3]
CARTER CR, 1960, MICH AGR EXP STA, V42, P737
[4]
COFFMAN FA, 1925, USDA1287 DEPT B
[5]
GRANTHAM AE, 1917, 117 DEL AGR EXP STA
[6]
GUTTAY J. R., 1957, MICHIGAN STATE UNIV AGRIC EXPT STA QUART BULL, V40, P193
[7]
KIESSELBACH TA, 1934, 286 NEBR AGR EXP STA
[9]
MURPHY H. F., 1930, JOUR AMER SOC AGRON, V22, P765
[10]
OLSON R. A., 1956, SOIL SCI SOC AMER PROC, V20, P19, DOI 10.2136/sssaj1956.03615995002000010005x