共 7 条
[1]
COOK R. L., 1937, Proceedings. Soil Science Society of America, V2, P375
[2]
COOK R. L., 1940, Proceedings. Soil Science Society of America, V5, P227
[3]
ELLIS BG, 1968, COMMUNICATION
[4]
JACKSON ML, 1964, SOIL CHEMICAL ANALYS
[5]
Richards L.A., 1954, USDA AGR HDB
[6]
RIEKE P. E., 1964, MICH AGR EXP STA QUART BULL, V46, P401
[7]
1970, E550 MICH STAT U EXT