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Fisher, Myles J.Rao, Idupulapati M.Ayarza, Miguel AngelLascano, Carlos E.Sanz Scovino, José IgnacioThomas, Richard J.Vera, Raúl R.[Carbon storage by introduced deep-rooted grasses in the South American savannas]Carbon storage by introduced deep-rooted grasses in the South American savannas

There is a limited knowledge on the inheritance of traits with agronomic relevance in cassava. A diallel study among 10 parental clones was conducted in the acid-soils environment in the eastern savannas of Colombia. Thirty clones were obtained for each F1 cross. Each clone was represented by six...


Calle, FPérez Velásquez, Juan CarlosGaitan, WMorante, NCeballos, H.Llano Rodríguez, Germán AlbertoÁlvarez, E.[Diallel inheritance of relevant traints in cassava (Manihot esculenta Crantz) adapted to acid-soil savannas]Diallel inheritance of relevant traints in cassava (Manihot esculenta Crantz) adapted to acid-soil savannas

Although there has been a growing interest in the study of soil fauna spatial distribution during the past decade, the identification of the environmental driving factors behind the population patterning are difficult to highlight. Soil physico-chemical heterogeneity is partly responsible for str...


Jiménez Jaén, J.J.Rossi, JP[Spatial dissociation between two endogeic earthworms in the Colombian "Llanos"]Spatial dissociation between two endogeic earthworms in the Colombian "Llanos"

The structure and seasonal changes of earthworm communities were evaluated in a natural savanna and in a improved grass-legume pasture in a Colombian oxisol over a period of 18 months. One plot of 90×90 m was isolated in each of the systems and each month five samples of 1 m2×0.5 m and ten of 20×...


Jiménez Jaén, J.J.Moreno, AlonsoDecaëns, ThibaudLavelle, Patrick M.Fisher, Myles J.Thomas, Richard J.[Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia]Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia

This study was carried out in the Eastern Plains of Colombia and assessed the impact of agricultural intensification on the structure of earthworm communities. Earthworms were hand-sorted in a variety of agroecosystems of increasing intensity, from natural savanna to pastures and annual crops. An...


Decaëns, ThibaudJiménez Jaén, J.J.[Earthworm communities under an agricultural intensification gradient in Colombia]Earthworm communities under an agricultural intensification gradient in Colombia
Friesen, Dennis K.Rao, Idupulapati M.Thomas, Richard J.Oberson, AstridSanz Scovino, José Ignacio[Adquisición y reciclaje de fósforo en sistemas de cultivos y pasturas en suelos tropicales de baja fertilidad]Adquisición y reciclaje de fósforo en sistemas de cultivos y pasturas en suelos tropicales de baja fertilidad

Aluminum toxicity limits plant growth in acid soils. Because of their advanced state of weathering, acid soils of the tropics also tend to be deficient in nutrients. A realistic assessment of plant adaptation to these soils would therefore require Al-toxic conditions under which growth is simulta...


Wenzl, PeterMancilla, LIMayer, Jorge EdgardAlbert, R.Rao, Idupulapati M.[Simulating infertile acid soils with nutrient solutions: The effects on Brachiaria species]Simulating infertile acid soils with nutrient solutions: The effects on Brachiaria species
Rivera, M.Amézquita Collazos, EdgarRao, Idupulapati M.Corrales, I.I.Chávez, Luis F.[Establecimiento de sistemas agropastoriles y su efecto en el rendimiento de cultivos en suelos ácidos de sabanas]Establecimiento de sistemas agropastoriles y su efecto en el rendimiento de cultivos en suelos ácidos de sabanas
Jiménez, J.J.Thomas, R.Fisher, M.Asakawa, N.Decaëns, ThibaudLavelle, Patrick M.Mariani, L[Impacto de los organismos del suelo en la diversidad vegetal y la abundancia: estudio de caso de una especie nativa de lombriz de tierra anécica]Impacto de los organismos del suelo en la diversidad vegetal y la abundancia: estudio de caso de una especie nativa de lombriz de tierra anécica

Phosphorus (P) deficiency and aluminium (Al) toxicity are widespread in Oxisols of the tropical savannas of eastern Colombia. A field experiment was conducted to determine the effect of Al toxicity and P deficiency on plant growth and nutrient uptake of two Brachiaria species. To examine the infl...


Hausller, KRao, Idupulapati M.Schultze-Kraft, RainerMarschner, H[Shoot and root growth of two tropical grasses, Brachiaria ruziziensis and B. dictyoneura, as influenced by aluminium toxicity and phosphorus deficiency in a sandy loam oxisol of the eastern plains of Colombia]Shoot and root growth of two tropical grasses, Brachiaria ruziziensis and B. dictyoneura, as influenced by aluminium toxicity and phosphorus deficiency in a sandy loam oxisol of the eastern plains of Colombia

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