共 20 条
[1]
Akpan-Idiok A. U., 2012, Journal of Agriculture, Biotechnology and Ecology, V5, P62
[2]
Amos TT, 2004, J FOOD AGRIC ENVIRON, V2, P173
[3]
Asadu C. L. A., 1990, NIGERIAN AGR J, V24, P55
[4]
Bandyopadhyay PK, 2003, J FOOD AGRIC ENVIRON, V1, P141
[5]
Bulktrade Investment Company Limited, 1989, MAIN REP SOIL LAND U
[6]
Consortium A, 2002, SOIL SURV FERT INV I
[7]
Diamond J., 2003, Ir. Geogr, V36, P32, DOI [DOI 10.1007/s12205-015-0210-x, 10.1080/00750770309555810, DOI 10.1080/00750770309555810]
[9]
Essien I. E., 2007, J AGR RES POLICIES, V2, P91
[10]
Ghamarnia H, 2010, J FOOD AGRIC ENVIRON, V8, P590