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To guide soil fertility investment programmes in sub-Saharan Africa, better understanding is needed of the relative importance of soil and crop management factors in determining smallholder crop yields and yield variability. Spatial variability in crop yields within farms is strongly influenced b...


Tittonell, Pablo A.Shepherd, Keith D.Vanlauwe, BernardGiller, Ken E.[Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya : An application of classification and regression tree analysis]Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya : An application of classification and regression tree analysis

While Carbon (C) sequestration on farmlands may contribute to mitigate CO2 concentrations in the atmosphere, greater agro-biodiversity may ensure longer term stability of C storage in fluctuating environments. This study was conducted in the highlands of western Kenya, a region with high potentia...


Henry, MTittonell, Pablo A.Manlay, RJBernoux, MartialAlbrecht, A.Vanlauwe, Bernard[Biodiversity, carbon stocks and sequestration potential in aboveground biomass in smallholder farming systems of western Kenya]Biodiversity, carbon stocks and sequestration potential in aboveground biomass in smallholder farming systems of western Kenya

Background and aims Incorporating soybean (Glycine max) genotypes with a high nitrogen fixation potential into cropping systems can sustainably improve the livelihoods of smallholder farmers in Western Kenya. Nitrogen fixation is, however, often constrained by low phosphorus (P) availability. The...


Vandamme, E.Renkens, M.Pypers, PieterSmolders, E.Vanlauwe, BernardMerckx, R.[Root hairs explain P uptake efficiency of soybean genotypes grown in a Pdeficient Ferralsol]Root hairs explain P uptake efficiency of soybean genotypes grown in a Pdeficient Ferralsol

In order to determine the improved soybean varieties that if recommended to the farmers would have a high probability of adoption, a farmer participatory approach was used to evaluate 12 soybean varieties at full podding in five locations (Oyani, Riana, Kasewe, Akiites, and Mabole) in western Ken...


Chianu, J.N.Vanlauwe, BernardMukulama, JAdesina, A.A.Sanginga, Nteranya[Farmer evaluation of improved soybean varieties being screened in five locations in Kenya : Implications for research and development]Farmer evaluation of improved soybean varieties being screened in five locations in Kenya : Implications for research and development

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

Crop promotion is critical for market creation and rural growth in Africa. How to achieve this for crops, other than major staples (e.g., maize) and traditional export crops (e.g., tea), remains a problem since most African countries tend to focus policy attention to major staples and traditional...


Chianu, J.N.Ohiokpehai, OVanlauwe, BernardAdesina, A.A.Groot, Hugo deSanginga, Nteranya[Promoting a versatile but yet minor crop : Soybean in the farming systems of Kenya]Promoting a versatile but yet minor crop : Soybean in the farming systems of Kenya

Many food production systems in sub-Saharan Africa are constrained by phosphorus (P). We hypothesized that within legume-cereal rotation systems: targeting P to the legume phase leads to higher system productivity, and that use of grain legumes leads to better economic returns than use of herbace...


Kihara, JobVanlauwe, BernardWaswa, Boaz S.Kimetu, J.M.Chianu, J.N.Bationo, B. André[Strategic phosphorus application in legume-cereal rotations increases land productivity and profitability in Western Kenya]Strategic phosphorus application in legume-cereal rotations increases land productivity and profitability in Western Kenya

Strong gradients of decreasing soil fertility are found with increasing distance from the homestead within smallholder African farms, due to differential resource allocation. As nutrient use efficiency varies strongly along these gradients, such heterogeneity must be considered when designing soi...


Tittonell, Pablo A.Vanlauwe, BernardLeffelaar, P.A.Shepherd, Keith D.Giller, Ken E.[Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status]Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status

Integrated soil fertility management (ISFM) technologies for African smallholders should consider (i) within-farm soil heterogeneity; (ii) long-term dynamics and variability; (iii) manure quality and availability; (iv) access to fertilizers; and (v) competing uses for crop residues. We used the m...


Tittonell, Pablo A.Corbeels, MarcWijk, Mark T. vanVanlauwe, BernardGiller, Ken E.[Combining organic and mineral fertilizers for integrated soil fertility management in smallholder farming systems of Kenya : Explorations using the crop-soil model FIELD]Combining organic and mineral fertilizers for integrated soil fertility management in smallholder farming systems of Kenya : Explorations using the crop-soil model FIELD

Declining soil fertility is a major cause of low per capita food production on smallholder farms of sub-Saharan Africa. This study attempted to provide an empirical explanation of the factors associated with farmers’ decisions to adopt or not to adopt newly introduced integrated soil fertility ma...


Mugwe, JMugendi, DNMucheru-Muna, M.Merckx, R.Chianu, J.N.Vanlauwe, Bernard[Determinants of the decision to adopt integrated soil fertility management practices by smallholder farmers in the central highlands of Kenya]Determinants of the decision to adopt integrated soil fertility management practices by smallholder farmers in the central highlands of Kenya

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