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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

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 tree component of agroforestry systems may interfere with N cycling in several ways. In alley cropping systems, first of all, the prunings added during the different activities have a certain biochemical quality and subsequent N release characteristics. Secondly, the quality of the complete o...


Vanlauwe, BernardSanginga, Nteranya[Impact of the tree component on N cycling in agroforestry systems under subhumid tropical conditions]Impact of the tree component on N cycling in agroforestry systems under subhumid tropical conditions

L‘intégration des légumineuses fixatrices d‘azote dans les systèmes techniques de production a donné lieu à de nombreux travaux de recherche destinés à améliorer ou restaurer la fertilité des terres, mais très peu de ces systèmes techniques sont vraiment appropriés par les paysans en Afrique de l...


Carsky, R.J.Douthwaite, BoruManyong, Victor M.Sanginga, NteranyaSchulz, S.Vanlauwe, BernardDiels, J.Keatinge, J.D.H.[Amélioration de la gestion des sols par l'introduction de légumineuses dans les systèmes céréaliers des savanes africaines]Amélioration de la gestion des sols par l'introduction de légumineuses dans les systèmes céréaliers des savanes africaines

The impact of land use (unfertilized continuous maize cropping, unfertilized and fertilized alley cropping with maize, Gliricidia sepium tree fallow, natural fallow) on the soil organic matter (SOM) status and general soil fertility characteristics were investigated for a series of soils represen...


Vanlauwe, BernardAihou, K.Tossah, S.Aman, B.K.Diels, J.Lyasse, O.Hauser, S.Sanginga, P.Merckx, R.[Nitrogen and phosphorus uptake by maize as affected by particulate organic matter quality, soil characteristics, and landuse history for soils from the West African moist savanna zone]Nitrogen and phosphorus uptake by maize as affected by particulate organic matter quality, soil characteristics, and landuse history for soils from the West African moist 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

The 13C natural labeling technique in combination with modeling could potentially be used to analyze SOM changes in long-term experiments involving complex cropping systems such as agroforestry systems. It requires information on quantity and 13C abundance of all plant materials entering the soil...


Diels, J.Vanlauwe, BernardSanginga, N.Coolen, E.Merckx, R.[Temporal variations in plant delta 13C values and implications for using the 13C technique in longterm soil organic matter studies]Temporal variations in plant delta 13C values and implications for using the 13C technique in longterm soil organic matter studies

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

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

The amounts of earthworm surface casts were monitored for 200 days after commencement of casting in three alley cropping experiments of different ages and hedgerow species. Casts were collected twice per week in transects from under the hedgerow to the middle of the interrow space. Average annual...


Hauser, S.Asawalam, D.O.Vanlauwe, Bernard[Spatial and temporal gradients of earthworm casting activity in alley cropping systems]Spatial and temporal gradients of earthworm casting activity in alley cropping systems

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