共 10 条
[1]
AGBOOLA AA, 1967, ODU, V4, P44
[2]
AMON BOE, 1964, ANNUAL REPORT RES DI
[3]
Broadbent F. E., 1947, SOIL SCI SOC AMER PROC, V11, P264
[4]
BROMFIELD AR, 1967, SOIL CHEM SEC W STAT
[5]
Jackson ML, 1958, SOIL CHEMICAL ANALYS
[6]
Keay R. W. J., 1959, OUTLINE NIGERIAN VEG
[7]
NYE PH, 1960, 51 COMM AGR BUR TECH
[8]
Smyth A. G., 1962, SOILS LAND CENTRAL W
[9]
WEBSTER CC, 1966, TROPICAL AGRICULTURE
[10]
1965, DEVELOPMENT NIGERIA, pPA52