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A large proportion of total P in the soils of the area is unavailable to plants and consequently P is the second most limiting nutrient. The labile and moderately labile phosphorus fractions and adsorption characteristics of surface and subsurface horizons of eleven soil profiles in the derived s...


Nwoke, O.C.Vanlauwe, BernardDiels, J.Sanginga, N.Osonubi, O.Merckx, R.[Assessment of labile phosphorus fractions and adsorption characteristics in relation to soil properties of West African savanna soils]Assessment of labile phosphorus fractions and adsorption characteristics in relation to soil properties of West African savanna soils

The differential ability of genotypes of soybean (Glycine max) and cowpea (Vigna unguiculata) to thrive under low-phosphorus (P) conditions by utilising P from sources with low solubility was assessed in a greenhouse study with a low-P savanna soil collected from a research field in Fashola, sout...


Nwoke, O.C.Diels, J.Abaidoo, R.C.Sanginga, N.[Utilization of phosphorus from different sources by genotypes of promiscuous soybean and cowpea in a lowphosphorus savanna soil]Utilization of phosphorus from different sources by genotypes of promiscuous soybean and cowpea in a lowphosphorus savanna soil

The role of residue characteristics in enhancing the availability of P was investigated in a greenhouse study using two soils from the northern Guinea savanna (NGS) and four from the derived savanna (DS) zones of the West African moist savanna. Eight organic residues of varying C-to-P ratio were ...


Nwoke, O.C.Vanlauwe, BernardDiels, J.Sanginga, NteranyaOsonubi, O.[Impact of residue characteristics on phosphorus availability in West African moist savanna soils]Impact of residue characteristics on phosphorus availability in West African moist savanna soils

The availability of P from rock phosphate (RP) is often too low to demonstrate an immediate impact on cereal production. Legumes may improve the immediate availability of P from RP and eventually benefit subsequent maize crops. The ability of Mucuna pruriens (L.) var utilis (Wright) Burck and Lab...


Vanlauwe, BernardNwoke, O.C.Diels, J.Sanginga, P.Carsky, R.J.Deckers, J.Merckx, R.[Utilization of rock phosphate by crops on a representative toposequence in the northern Guinea savanna zone of Nigeria: response by Mucuna pruriens, Lablab purpureus, and maize]Utilization of rock phosphate by crops on a representative toposequence in the northern Guinea savanna zone of Nigeria: response by Mucuna pruriens, Lablab purpureus, and maize

Information on the inter- and intra-specific variability in the acquisition and utilization of phosphorus (P) by promiscuous soybean genotypes under low-P conditions can be helpful in the short-term management of soil P availability. Thirteen promiscuous soybean genotypes were evaluated in a low-...


Nwoke, O.C.Okogun, JASanginga, NteranyaDiels, J.Abaidoo, R.C.Osonubi, O.[Phosphate rock utilization by soybean genotypes on a low-P savanna soil and the status of soil P fractions after a subsequent maize crop]Phosphate rock utilization by soybean genotypes on a low-P savanna soil and the status of soil P fractions after a subsequent maize crop

Root characteristics associated with phosphorus (P) uptake under limiting soil-P conditions were examined in two sets of greenhouse experiments. Average diameter and length of soybean, cowpea, maize and sorghum roots were assessed after 7 weeks in three low-P soils amended with P fertilizer at 0,...


Nwoke, O.C.Diels, J.Abaidoo, R.C.Nziguheba, GeneroseMerckx, R.[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]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

The fractionation of soil P into various organic and inorganic pools with differing levels of bioavailability, coupled with knowledge of the P adsorption and desorption characteristics of the soils, provides insights into management strategies that enhance P availability to crops. Sequential soil...


Nwoke, O.C.Vanlauwe, BernardDiels, J.Sanginga, NteranyaOsonubi, O.[The distribution of phosphorus fractions and desorption characteristics of some soils in the moist savanna zone of West Africa]The distribution of phosphorus fractions and desorption characteristics of some soils in the moist savanna zone of West Africa

The fumigation–incubation (FI) and the fumigation–extraction (FE) ninhydrin methods for quantifying the microbial biomass pool were tested and the relationships between microbial biomass characteristics and soil organic matter fractions (separated following particle size) investigated for a range...


Vanlauwe, BernardNwoke, O.C.Sanginga, N.Merckx, R.[Evaluation of methods for measuring microbial biomass C and N and relationship between microbial biomass with soil organic matter particle size classes in West African soils]Evaluation of methods for measuring microbial biomass C and N and relationship between microbial biomass with soil organic matter particle size classes in West African soils

Crop response, tree biomass production and changes in soil fertility characteristics were monitored in a long-term (1986–2006) alley-cropping trial in Ibadan, Nigeria. The systems included two alley cropping systems with Leucaena leucocephala and Senna siamea on the one hand and a control (no-tre...


Vanlauwe, BernardNziguheba, GeneroseNwoke, O.C.Diels, J.Sanginga, NteranyaMerckx, R.[Long-term integrated soil fertility management in South-Western Nigeria: crop performance and impact on the soil fertility status]Long-term integrated soil fertility management in South-Western Nigeria: crop performance and impact on the soil fertility status

A laboratory incubation experiment with 15N labeled root and leaf residues of 3 agroforestry species (Leucaena leucocephala, Dactyladenia harto'i and Flemingia macrophylla) was conducted under controlled conditions (25 °C) for 56 days to quantify residue C and N mineralization and its relationshi...


Vanlauwe, BernardNwoke, O.C.Sanginga, N.Merckx, R.[Impact of residue quality on the C and N mineralization of leaf and root residues of three agroforestry species]Impact of residue quality on the C and N mineralization of leaf and root residues of three agroforestry species

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