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Chemical sequential extraction is widely used to divide soil phosphorus (P) into different inorganic (Pi) and organic (Po) fractions, but the assignment of these fractions to pools of differing plant availability, especially for low P tropical soils, is still matter of discussion. To improve this...


Buehler, S.Oberson, AstridRao, Idupulapati M.Friesen, Dennis K.Frossard, Emmanuel[Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems]Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems
Borrero, GonzaloFriesen, Dennis K.Oberson, AstridRodríguez, M.Rao, Idupulapati M.[Destinos de fósforo aplicado como fertilizante en oxisoles de los Llanos Orientales de Colombia: fraccionamiento secuencial]Destinos de fósforo aplicado como fertilizante en oxisoles de los Llanos Orientales de Colombia: fraccionamiento secuencial

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

In this study, we investigated the spatial distribution of an earthworm community together with the heterogeneity of selected soil properties in a gallery forest (GF) of the Colombian Llanos . We performed fine-scale spatial variability by intensively sampling 100 points distributed in the nodes...


Jiménez, J.J.Decaëns, ThibaudAmézquita Collazos, EdgarRao, Idupulapati M.Thomas, Richard J.Lavelle, Patrick M.[Short range spatial variability of soil physico-chemical variables related to earthworm clustering in a Neotropical gallery forest]Short range spatial variability of soil physico-chemical variables related to earthworm clustering in a Neotropical gallery forest

A greenhouse experiment was conducted at the International Centre for Tropical Agriculture in Colombia to evaluate effects of the fungal endophyte, Acremonium implicatum, on growth and physiological responses of five Brachiaria cultivars. Plants were grown under well-watered (WW) and drought-stre...


Odokonyero, KennedyAcuña, Tina BotwrightCardoso Arango, Juan AndrésJiménez Serna, Juan de la CruzRao, Idupulapati M.[Effect of Endophyte Association with Brachiaria Species on Shoot and Root Morpho-physiological Responses under Drought Stress]Effect of Endophyte Association with Brachiaria Species on Shoot and Root Morpho-physiological Responses under Drought Stress
Rubiano Mejía, Jorge EliécerSoto, V.Rajasekharan, MayaCook, Simon E.Douthwaite, BoruRao, Idupulapati M.[Extrapolation domain analysis: a method to estimate potential global impacts of research projects]Extrapolation domain analysis: a method to estimate potential global impacts of research projects
Castro, A.Rivera Peña, MFerreira, OscarPavón, JGarcía, E.Amézquita Collazos, EdgarAyarza, Miguel AngelBarrios, E.Rondón, Marco AntonioPauli, N.Baltodano, Maria EugeniaMendoza, B.Álvarez Welchez, LuisJohnson, Nancy L.Cook, Simon E.Rao, Idupulapati M.[Improving the efficiency of rain water use in smallholder farms in sub-humid tropics: agricultural and environment benefits of Quesungual agroforestry system]Improving the efficiency of rain water use in smallholder farms in sub-humid tropics: agricultural and environment benefits of Quesungual agroforestry system
Pavon, J.Amézquita Collazos, EdgarMenocal, O.Ayarza, Miguel AngelRao, Idupulapati M.[Application of QSMAS principles to drought-prone areas of Nicaragua: characterization of soil chemical and physical properties under traditional and QSMAS validation plots in La Danta watershed in Somotillo]Application of QSMAS principles to drought-prone areas of Nicaragua: characterization of soil chemical and physical properties under traditional and QSMAS validation plots in La Danta watershed in Somotillo
Rivera, M.Amézquita Collazos, EdgarRicaurte, J.Ayarza, Miguel AngelRao, Idupulapati M.[Effects of different proportions of stones in soil and frequencies of water application in the production of biomass of maize under greenhouse conditions using soil from hillsides]Effects of different proportions of stones in soil and frequencies of water application in the production of biomass of maize under greenhouse conditions using soil from hillsides
Rivera, M.Amézquita Collazos, EdgarAyarza, Miguel AngelRicaurte, J.García, E.Rao, Idupulapati M.[Soil physical characterization for determining water dynamics in Quesungual Slash and Mulch Agroforestry System (QSMAS): Establishing the baseline at time zero]Soil physical characterization for determining water dynamics in Quesungual Slash and Mulch Agroforestry System (QSMAS): Establishing the baseline at time zero

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