共 20 条
[1]
ANDREWS W. B., 1942, Journal of the Association of Official Agricultural Chemists, V25, P498
[2]
[Anonymous], 1955, OFFICIAL METHODS ANA
[4]
BAKER GO, 1952, 3RD ANN PAC NW FERT, P66
[5]
BROWN EJ, UNPUB
[6]
CLARK KG, 1952, FARM CHEM, V115, P17
[7]
DION H. G., 1949, SCI AGRIC [OTTAWA], V29, P167
[8]
DION H. G., 1949, SCI AGRIC [OTTAWA], V29, P512
[9]
JACOB KD, 1953, AGRONOMY SOIL FERTIL, V4, P299
[10]
LAWTON K, 1955, FARM CHEM, V118, P44