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Nutrient balances are useful tools as indicators of potential land degradation and for optimizing nutrient use, and are thus highly relevant in the African context. A comprehensive literature review on nutrient balances in Africa was carried out to illustrate the main approaches, challenges, and ...


Cobo Borrero, Juan G.Dercon, G.Cadisch, Georg[Nutrient balances in African land use systems across different spatial scales: a review of approaches, challenges and progress]Nutrient balances in African land use systems across different spatial scales: a review of approaches, challenges and progress

Leaves of nine green manure (GM) species were surface applied to a tropical volcanic-ash soil at a rate of 100 kg N ha 1 in order to evaluate their N-fertilizer value in a glasshouse experiment. GM treatments were compared to urea at two rates, 50 kg N ha 1 (FN50) and 100 kg N ha 1 (FN100), and t...


Cobo Borrero, Juan G.Barrios, E.Kass, DCLThomas, Richard J.[Nitrogen mineralization and crop uptake from surface-applied leaves of green manure species on a tropical volcanic-ash soil]Nitrogen mineralization and crop uptake from surface-applied leaves of green manure species on a tropical volcanic-ash soil

The decomposition and nutrient release of 12 plant materials were assessed in a 20-week litterbag field study in hillsides from Cauca, Colombia. Leaves of Tithonia diversifolia (TTH) and Indigofera constricta (IND) decomposed quickly (k=0.035±0.002 d?1), while those of Cratylia argentea (CRA) and...


Cobo Borrero, Juan G.Barrios, E.Kass, DCLThomas, Richard J.[Decomposition and nutrient release by green manures in a tropical hillside agroecosystem]Decomposition and nutrient release by green manures in a tropical hillside agroecosystem
Cobo Borrero, Juan G.Dercon, G.Delve, Robert J.Cadisch, Georg[Assessing the variability of soil quality and crop productivity at different spatial scales in three settlement schemes in NE Zimbabwe by integrating mid-infrared spectroscopy and geostatistical tools]Assessing the variability of soil quality and crop productivity at different spatial scales in three settlement schemes in NE Zimbabwe by integrating mid-infrared spectroscopy and geostatistical tools

Planted fallow systems under slash and mulch management were compared with natural fallow systems at two farms (BM1 and BM2) in the Colombian Andes. The BM1 site was relatively more fertile than the BM2 site. Planted fallow systems evaluated included Calliandra calothyrsus CIAT 20400 (CAL), Ind...


Barrios, E.Cobo Borrero, Juan G.[Plant growth, biomass production and nutrient accumulation by slash/mulch agroforestry systems in tropical hillsides of Colombia]Plant growth, biomass production and nutrient accumulation by slash/mulch agroforestry systems in tropical hillsides of Colombia
Barrios, EdmundoCobo Borrero, Juan G.Rao, Idupulapati M.Thomas, Richard J.Amézquita Collazos, EdgarJiménez Jaén, Juan JoséRondón, Marco Antonio[Fallow management for soil fertility recovery in tropical Andean agroecosystems in Colombia]Fallow management for soil fertility recovery in tropical Andean agroecosystems in Colombia

Crop simulation models have been used successfully to evaluate many systems and the impact of change on these systems, e.g. for climatic risk and the use of alternative management options, including the use of nitrogen fertilisers. However, for low input systems in tropical and subtropical region...


Delve, Robert J.Probert, MECobo Borrero, Juan G.Ricaurte Oyola, José JaumerRivera Pena, MBarrios, E.Rao, Idupulapati M.[Simulating phosphorus responses in annual crops using APSIM : Model evaluation on contrasting soil types]Simulating phosphorus responses in annual crops using APSIM : Model evaluation on contrasting soil types

Knowledge of soil spatial variability is important in natural resource management, interpolation and soil sampling design, but requires a considerable amount of geo-referenced data. In this study, mid-infrared spectroscopy in combination with spatial analyses tools is being proposed to facilitate...


Cobo Borrero, Juan G.Dercon, G.Yekeye, TChapungu, LKadzere, CMurwira, ADelve, Robert J.Cadisch, Georg[Integration of mid-infrared spectroscopy and geostatistics in the assessment of soil spatial variability at landscape level]Integration of mid-infrared spectroscopy and geostatistics in the assessment of soil spatial variability at landscape level
Monje, CCobo Borrero, Juan G.Dercon, G.Cadisch, GeorgDelve, Robert J.[Biophysical factors affecting maize productivity of small-scale farming system under settlement schemes in North-East Zimbabwe]Biophysical factors affecting maize productivity of small-scale farming system under settlement schemes in North-East Zimbabwe

Cobo Borrero, Juan G.Dercon, G.Delve, Robert J.Cadisch, Georg[Scaling-up nutrient balances from plot to village level under small-holder settlement schemes in sub-humid Zimbabwe]Scaling-up nutrient balances from plot to village level under small-holder settlement schemes in sub-humid Zimbabwe

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