共 9 条
[1]
CHESNIN LEON, 1951, SOIL SCI SOC AMER PROC, V15, P149
[3]
JONES JB, 1973, SOIL TESTING PLANT A, P323
[4]
MASSEY H. F., 1957, SOIL SCI, V83, P123, DOI 10.1097/00010694-195702000-00006
[5]
OLSEN SR, 1954, US DEP AGR CIRCULAR, P19
[6]
Pipper C.S., 1950, SOIL PLANT ANAL, V1st, P47
[7]
Small H.G., 1973, SOIL TESTING PLANT A, P315
[9]
1971, FAO PRODUCTION YB