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Twenty Mimosa-nodulating bacterial strains from Brazil and Venezuela, together with eight reference Mimosa-nodulating rhizobial strains and two other ?-rhizobial strains, were examined by amplified rRNA gene restriction analysis. They fell into 16 patterns and formed a single cluster together wit...


Chen, W.M.Faria, S.M. deStraliotto, RPitard, RMSimoes-Araujo, JLChou, JHChou, YJBarrios, E.Prescott, ARElliott, GNSprent, JIYoung, JPWJames, EK[Proof that Burkholderia strains form effective symbioses with legumes : A study of novel Mimosa-nodulating strains from South America]Proof that Burkholderia strains form effective symbioses with legumes : A study of novel Mimosa-nodulating strains from South America
Fonte, Steven J.Barrios, E.Six, Johan[Earthworms, soil fertility and aggregate-associated soil organic matter dynamics in the Quesungual agroforestry system]Earthworms, soil fertility and aggregate-associated soil organic matter dynamics in the Quesungual agroforestry system

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

Soil organic matter (SOM) and phosphorus (P) fractions play a key role in sustaining the productivity of acid-savanna oxisols and are greatly influenced by tillage practices. In 1993, a long-term experiment on sustainable crop rotation and ley farming systems was initiated on a Colombian acid-sav...


Basamba, T.A.Barrios, E.Amézquita Collazos, EdgarRao, Idupulapati M.Singh, B.R.[Tillage effects on maize yield in a Colombian savanna oxisol : Soil organic matter and P fractions]Tillage effects on maize yield in a Colombian savanna oxisol : Soil organic matter and P fractions

Soil fertility replenishment is a critical factor that many farmers in the tropical American hillsides have to cope with to increase food crop production. The effect of three planted fallow systems (Calliandra houstoniana-CAL, Indigofera zollingeriana-IND, Tithonia diversifolia-TTH) and a crop ro...


Basamba, T.A.Barrios, E.Singh, B.R.Rao, Idupulapati M.[Impact of planted fallows and a crop rotation on nitrogen mineralization and phosphorus and organic matter fractions on a Colombian volcanic-ash soil]Impact of planted fallows and a crop rotation on nitrogen mineralization and phosphorus and organic matter fractions on a Colombian volcanic-ash soil

The increasing attention paid to local soil knowledge in recent years is the result of a greater recognition that the knowledge of people who have been interacting with their soils for long time can offer many insights about the sustainable management of tropical soils. This paper describes two a...


Barrios, E.Trejo Tercero, M.T.[Implications of local soil knowledge for integrated soil management in Latin America]Implications of local soil knowledge for integrated soil management in Latin America

Near infrared reflectance spectroscopy (NIRS) analysis was used to discriminate soils of different agroecosystems in Colombia, with different contents and qualities of organic matter, chemical, and biological properties. Correlations were sought between absorbance in wavelength classes as determ...


Velásquez, E.Lavelle, Patrick M.Barrios, E.Joffre, RReversat, F[Evaluating soil quality in tropical agroecosystems of Colombia using NIRS]Evaluating soil quality in tropical agroecosystems of Colombia using NIRS

Lack of synchronization between N released from prunings applied to the soil as green manures and crop uptake as well as optimization of protein digestibility for ruminants, remain major research objectives for the selection of multipurpose tree and shrub legumes (MPT) for mixed smallholder syste...


Tscherning, KLascano, Carlos E.Barrios, E.Schultze-Kraft, RainerPeters, Michael[The effect of mixing prunings of two tropical shrub legumes (Calliandra houstoniana and Indigofera zollingeriana) with contrasting quality on N release in the soil and apparent N degradation in the rumen]The effect of mixing prunings of two tropical shrub legumes (Calliandra houstoniana and Indigofera zollingeriana) with contrasting quality on N release in the soil and apparent N degradation in the rumen

Organic resources (ORs) are essential inputs in tropical farming systems and their decomposition dynamics are related to their quality. A Decision Support System (DSS) for organic N management has been proposed earlier that subdivides ORs in four classes depending on their N, lignin, and soluble ...


Vanlauwe, BernardGachengo, CNShepherd, Keith D.Barrios, E.Cadisch, GeorgPalm, C.A.[Laboratory validation of a resource quality-based conceptual framework for organic matter management]Laboratory validation of a resource quality-based conceptual framework for organic matter management

Se evaluó la respuesta de la aplicación de cinco inóculos de hongos micorrícico arbusculares (HMA), Entrophospora colombiana-ECLB, Gigaspora margarita-GMRG, Glomus manihotis-LMNH y mezcla viva y esterilizada de estas tres especies de HMA en sustrato sin desinfectar (SD) y desinfectado (D) sembrad...


Zarate, LMBarrios, E.Sánchez, M.Caballero, LM[Participación del micelio externo de hongos micorrícico-arbusculares en la formación de agregados estables alagua en suelos de ladera con influencia de cenizas volcánicas = Participation of external mycelium of arbuscular mycorrhizal fungi in the formation of water stable aggregates in slope grounds with volcanic ash influence]Participación del micelio externo de hongos micorrícico-arbusculares en la formación de agregados estables alagua en suelos de ladera con influencia de cenizas volcánicas = Participation of external mycelium of arbuscular mycorrhizal fungi in the formation of water stable aggregates in slope grounds with volcanic ash influence

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