共 7 条
[1]
OLSEN SR, 1954, USDA939 CIRC
[2]
Pipper C.S., 1950, SOIL PLANT ANAL, V1st, P47
[3]
SUBHIAH BV, 1956, CURRENT SCIENCE, V25, P328
[4]
TRUOG E, 1960, 7 INT C SOIL SCI, V4
[5]
UPPAL HL, 1957, REPORT ACTION COMMIT
[7]
Walkley A., 1947, SOIL SCI, V63, P254