共 14 条
[1]
BALDWIN KDS, 1957, NIGERIA AGR PROJECT
[2]
Couper D. C., 1979, Soil tillage and crop production., P147
[3]
Kowal J., 1970, Nigerian Agricultural Journal, V7, P120
[5]
LAL R, 1976, GEODERMA, V16, P365
[6]
MBAGWU JSC, 1984, SOIL SCI SOC AM J
[7]
MOORMANN FR, 1975, IITA TECH B, V3
[8]
PHILIP J. R., 1957, SOIL SCI, V84, P257, DOI 10.1097/00010694-195709000-00010
[9]
ROOSE E, 1980, THESIS U ORLEANS FRA
[10]
SCHULZE FE, 1980, ILRI PUBL INT I LAND, V27, P13