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Sustainable use (in terms of nutrients) of soil resources by farmers in Sub-Saharan Africa is constrained by institutions and markets. This paper explores the case of northern Nigeria, by using a combination of multi-attribute utility theory and bio-economic modelling. This approach allowed us to...


Berkhout, E.D.Schipper, R.A.Keulen, H. vanCoulibaly, O.[Heterogeneity in farmers production decisions and its impact on soil nutrient use: results and implications from northern Nigeria]Heterogeneity in farmers production decisions and its impact on soil nutrient use: results and implications from northern Nigeria

High-altitude ecosystems shelter important reserves of biodiversity, water provision and soil organic carbon (SOC) stocks. Climate change, agricultural encroachment, overgrazing, and mining activities are endangering ecosystems sustainability, particularly in the high-Andean Puna. Increasing food...


Rolando, J.L.Turin, C.Ramírez, D.Mares, V.Monerris, J.Quiróz, R.[Key ecosystem services and ecological intensification of agriculture in the tropical high-Andean Puna as affected by land-use and climate changes.]Key ecosystem services and ecological intensification of agriculture in the tropical high-Andean Puna as affected by land-use and climate changes.

Cowpeas suffer major yield losses due to insect pests, so insect resistant cowpea varieties are being developed to minimize insecticide use in integrated pest management. Experiments during the cropping seasons of 2002–2004 at Kano, Nigeria, evaluated four cowpea varieties and five combinations o...


Ajeigbe, Hakeem A.Singh, B.B.[Integrated pest management in cowpea: effect of time and frequency of insecticide application on productivity]Integrated pest management in cowpea: effect of time and frequency of insecticide application on productivity
Cock, Matthew J.W.Biesmeijer, Jacobus C.Cannon, Raymond J.C.Gerard, Philippa J.Gillespie, DaveJiménez, Juan J.Lavelle, Patrick M.Raina, Suresh K.[The positive contribution of invertebrates to sustainable agriculture and food security]The positive contribution of invertebrates to sustainable agriculture and food security
Spain, James M.[Los Llanos Orientales de Colombia, zona de grandes posibilidades agropecuarias]Los Llanos Orientales de Colombia, zona de grandes posibilidades agropecuarias

The effect of fertilizer and mulch across tropic level of the cassava ecosystem, i.e. the plant, the cassava mealybug(CM), the wasp Apoanagyrus lopezi and its hyperparasitoids, was studied in two field experiments planted ins southern Benin. Several cassava cultivars with different branching patt...


Schulthess, F.Neuenschwander, P.Gounou, S.[Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa]Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa

Expansion of crop production into high-altitude native grasslands is occurring in the Peruvian High-Andes due to climate change and agricultural intensification, with little understanding of the consequences to the ecosystem. The objective of this study was to determine the impact of land-use cha...


Rolando, J.L.Dubeux, J.C.Ramírez, D.Ruiz Moreno, M.Turin, C.Mares, V.Sollenberger, L.Quiróz, R.[Land use effects on soil fertility and nutrient cycling in the Peruvian High-Andean puna grasslands.]Land use effects on soil fertility and nutrient cycling in the Peruvian High-Andean puna grasslands.

Trees can influence both the supply and availability of nutrients in the soil. Trees increase the supply of nutrients within the rooting zone of crops through (1) input of N by biological N2 fixation, (2) retrieval of nutrients from below the rooting zone of crops and (3) reduction in nutrient lo...


Buresh, R.J.Tian, G.[Soil improvement by trees in sub-Saharan Africa]Soil improvement by trees in sub-Saharan Africa

Research to identify appropriate means of sustaining tropical soil productivity has intensified during the last 2 decades and promising technologies such as minimum tillage, herbaceous and tree based systems, and improved fallows have been identified. This paper discusses the contribution of soil...


Sanginga, N.Mulongoy, K.Swift, M.[Contribution of soil organisms to the sustainability and productivity cropping systems in the tropics]Contribution of soil organisms to the sustainability and productivity cropping systems in the tropics

Intensification of agriculture in the tropics has resulted from a shortage of farmland and insufficient food production to satisfy the needs of an expanding population. Many tropical farmers are challenged by the prospect of intensifying their production while sustaining or improving the fertilit...


Beare, M.H.Reddy, M.V.Tian, G.Srivastava, S.C.[Agricultural intensification, soil biodiversity and agroecosystem function in the tropics: the role of decomposer biota]Agricultural intensification, soil biodiversity and agroecosystem function in the tropics: the role of decomposer biota

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