Organic acids in the rhizosphere and root characteristics of soybean (Glycine max) and cowpea (Vigna unguiculata) in relation to phosphorus uptake in poor savanna soils
Onyegbula Chike Nwoke1*, Jan Diels2, Robert Abaidoo1, Generose Nziguheba3and Roel Merckx2
1Soil Research Unit, International Institute of Tropical Agriculture, Ibadan, Nigeria.
2Division of Soil and Water Management, Department of Land Management and Economics K.U. Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium.3Tropical Agriculture and Rural Environment, The Earth Institute at Columbia University, USA.
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