共 16 条
[11]
PAGE A L, 1972, Journal of Environmental Quality, V1, P288, DOI 10.2134/jeq1972.00472425000100030017x
[12]
PAGE AL, 1974, USEPA670274005
[13]
SANDSTEAD HH, 1975, 155 GEOL SOC AM SP P, P73
[14]
TURNER M A, 1973, Journal of Environmental Quality, V2, P118
[15]
WILKINSON HF, 1972, MICRONUTRIENTS AGRIC, P159
[16]
9228 US DEP AGR AGR