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Scanty information on long-term soil organic carbon (SOC) dynamics hampers validation of SOC models in the tropics. We observed SOC content changes in a 16-year continuously cropped agroforestry experiment in Ibadan, south-western Nigeria. SOC levels declined in all treatments. The decline was mo...


Diels, J.Vanlauwe, BernardMeersch, M.K. van derSanginga, N.Merckx, R.[Longterm soil organic carbon dynamics in a subhumid tropical climate: 13C data in mixed C3/C4 cropping and modeling with ROTHC]Longterm soil organic carbon dynamics in a subhumid tropical climate: 13C data in mixed C3/C4 cropping and modeling with ROTHC

The functioning of trees as a safety-net for capturing nutrients leached beyond the reach of crop roots was evaluated by investigating changes in exchangeable cations (Ca, Mg, and K) and pH in a wide range of medium to long term alley cropping trials in the derived savanna of West Africa, compare...


Vanlauwe, BernardAihou, K.Tossah, B.Diels, J.Sanginga, NteranyaMerckx, R.[Senna siamea trees recycle Ca from a Carich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone]Senna siamea trees recycle Ca from a Carich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone

Crop response, tree biomass production and changes in soil fertility characteristics were monitored in a long-term (1986–2002) 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, BernardDiels, J.Sanginga, NteranyaMerckx, R.[Long term integrated soil fertility management in southwestern Nigeria: crop performance and impact on the soil fertility status]Long term integrated soil fertility management in southwestern Nigeria: crop performance and impact on the soil fertility status

The potential of alley cropping systems supplied with a limited amount of fertilizer to restore crop productivity on a degraded site and to maintain crop productivity on a recently cleared, non-degraded site on ‘terre de barre' soils in Southern Bénin was investigated from 1994 to 1996. Leucaena ...


Aihou, K.Sanginga, N.Vanlauwe, BernardLyasse, O.Diels, J.Merckx, R.[Alley cropping in the moist savanna of West Africa I. Restoration and maintenance of soil fertility on terre de barre soils in Benin Republic]Alley cropping in the moist savanna of West Africa I. Restoration and maintenance of soil fertility on terre de barre soils in Benin Republic

The functioning of trees as a safety-net for capturing nutrients leached beyond the reach of crop roots was evaluated by investigating changes in exchangeable cations (Ca, Mg, and K) and pH in a wide range of medium to long term alley cropping trials in the derived savanna of West Africa, compare...


Vanlauwe, BernardAihou, K.Tossah, B.K.Diels, J.Sanginga, NteranyaMerckx, R.[Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone]Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone

Crop response, tree biomass production and changes in soil fertility characteristics were monitored in a long-term (1986–2002) 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, BernardDiels, 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

In cropping systems with limited amounts of external inputs, the soil organic matter pool (SOM) may contribute significantly to plant nutrition. The impact of organic inputs on total SOM and particulate organic matter (POM) N contents as affected by soil type and the relationships between sources...


Vanlauwe, BernardAman, S.Aihou, K.Tossah, B.K.Adebiyi, V.Sanginga, N.Lyasse, O.Diels, J.Merckx, R.[Alley cropping in the moist savanna of West Africa III. Soil organic matter fractionation and soil productivity]Alley cropping in the moist savanna of West Africa III. Soil organic matter fractionation and soil productivity

The moist savanna of West-Africa is characterized by a wide range of climates and soil types. The impact of the biophysical environment on hedgerow N uptake, wood production and maize grain yield was assessed for three years in three alley cropping trials with a selected number of hedgerow specie...


Tossah, B.K.Zamba, D.K.Vanlauwe, BernardSanginga, N.Lyasse, O.Diels, J.Merckx, R.[Alley cropping in the moist savanna of West Africa II. Impact on soil productivity in a northtosouth transect in Togo]Alley cropping in the moist savanna of West Africa II. Impact on soil productivity in a northtosouth transect in Togo

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

The recovery of a single application of leucaena (Leucaena leucocephala) leaf N (78 kg N ha−1) in a maize crop, the hedgerow and the top 10 cm soil of a leucaena alley cropping system was measured for 236 d through the use of 15N labeled residues. The leucaena-derived-N (LDN) was followed in the ...


Vanlauwe, BernardSwift, M.J.Merckx, R.[Soil litter dynamics and N use in a leucaena (Leucaena leucocephalaLam. (de Witt)) alley cropping system in southwestern Nigeria]Soil litter dynamics and N use in a leucaena (Leucaena leucocephalaLam. (de Witt)) alley cropping system in southwestern Nigeria

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