Search Results - "Colombians"

Analysis of threats to South American flora and its implications for conservation by Ramírez Villegas, Julián Armando, Jarvis, Andy, Trouval, Jerry

“…Critical areas to monitor, expand and strengthen are mainly located in the Ecuadorian and Colombian Andes, southern Paraguay, the Guyana shield, southern Brazil, and Bolivia.…”
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Disc harrowing intensity and its impact on soil properties and plant growth of agropastoral systems in the Llanos of Colombia by Phiri, S, Amézquita Collazos, Edgar, Rao, Idupulapati M., Singh, B.R.

“…Oxisols such as those of the Colombian Eastern Plains (Llanos) are susceptible to physical, chemical and biological degradation once brought into cultivation, especially under intensive use of machinery. …”
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Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia by Jiménez Jaén, J.J., Moreno, Alonso, Decaëns, Thibaud, Lavelle, Patrick M., Fisher, Myles J., Thomas, Richard J.

“…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 20×20×20 cm were randomly selected from a stratified block design. …”
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Plant growth, biomass production and nutrient accumulation by slash/mulch agroforestry systems in tropical hillsides of Colombia by Barrios, E., Cobo Borrero, Juan G.

“…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. …”
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Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems by Buehler, S., Oberson, Astrid, Rao, Idupulapati M., Friesen, Dennis K., Frossard, Emmanuel

“…To improve this assignment, the effect of land-use systems and related P fertilizer inputs on size of P fractions and their isotopic exchangeability was investigated. A Colombian Oxisol, sampled from a long-term field experiment with contrasting management treatments, was labeled with carrier free 33P and extracted after incubation times of 4 h, 1, and 2 wk. …”
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Short range spatial variability of soil physico-chemical variables related to earthworm clustering in a Neotropical gallery forest by Jiménez, J.J., Decaëns, Thibaud, Amézquita Collazos, Edgar, Rao, Idupulapati M., Thomas, Richard J., Lavelle, Patrick M.

“…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 of a regular grid with 5 m inter-sample distance. …”
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Simulating infertile acid soils with nutrient solutions: The effects on Brachiaria species by Wenzl, Peter, Mancilla, LI, Mayer, Jorge Edgard, Albert, R., Rao, Idupulapati M.

“…We analyzed soil solutions of two Oxisols from the Colombian savannas. Nutrient concentrations were extremely low (ionic strength <1.7 mM). …”
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The relationship of farm surroundings and local infestation pressure to pest management in cultivated Passiflora species in Colombia? by Wyckhuys, Kris A.G., López Acosta, F.J., Rojas, M., Ocampo, J

“…Here, we relate agro-ecological knowledge and pest management of Colombian Passiflora producers to local Lonchaeid infestation levels and farm surroundings. …”
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Los fríjoles colombianos Lima y común: puntos de vista de su origen y el significado de su evolución by Debouck, Daniel G.

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Effects of conservation tillage on total and aggregated soil organic carbon in the Andes by Quintero, Marcela, Comerford, N.B.

“…Many Andisols of the Andes have been disturbed by traditional potato-based rotation agriculture disrupting soil structure, water retention capacity and organic matter content.This study was undertaken to investigate the contribution of conservation farming technology or reduced tillage in potato-based rotations in the Colombian Andes in order to rehabilitate total and aggregated soil organic C in disturbed organic matter-rich Andisols.Soils were sampled from farms with 7-year of reduced tillage and farms with conventional farming practices.Ultrasound energy was applied to samples to disrupt aggregation and total soil C was determined in order to investigate the amount of carbon held inside the aggregates of different soil size classes.Results indicated that reduced tillage in potato-based crop rotations increased the soil C concentration and average C content in the whole profile (≈117 cm depth) by 50 and 33% (1636 t C ha -1 vs. 1224 t C ha -1 ), respectively, as compared to conventional farming practices.Carbon content increased 177% in the subsoil (A2 horizon, 78 -117 cm depth, from 215 to 596 t•ha -1 ), although most of the soil C was in the A1 horizon (between 0 -78 cm average thickness, 1097 t•ha -1 ).These increases show that reduced tillage enhances C stores in Andisols which are already high in organic matter.In addition, C in aggregates represented more than 80% of the total organic matter and it was positively affected by conservation practices.The C increase was preferential in the smaller macroaggregates (<2 mm).The aggregate dispersion energy curves further suggested that C increase was occurring in microaggregates within the smaller macroaggregate fraction.Data suggested that smaller macroaggregates can be used in these soils to evaluate the influence of field management practices on soil C sequestration.…”
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The feasibility of introducing opaque-2 maize for human consumption in Colombia by Pinstrup-Andersen, Per

“…Furthermore, a number of alternative public policy measures which could be applied by the Colombian government with respect to Opaque-2 maize were outlined. …”
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Achieving CO2 Reductions In Colombia: Effects of Carbon Taxes and Abatement Targets by Calderón, Silvia L, Álvarez, Andrés Camilo, Loboguerrero Rodriguez, Ana María, Arango, Santiago, Calvin, Katherine, Kober, Tom, Daenzer, Kathryn, Fisher-Vanden, Karen

“…By comparing baseline and policy scenario results from two integrated assessment partial equilibrium models TIAM-ECN and GCAM and two general equilibrium models Phoenix and MEG4C, we provide an indication of future developments and dynamics in the Colombian energy system. Currently, the carbon intensity of the energy system in Colombia is low compared to other countries in Latin America. …”
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Caracterización de recursos forrajeros de sistemas de pastoreo de la altillanura colombiana usando el algoritmo LOCAL con espectroscopía en el infrarrojo cercano by Ariza Nieto, Claudia Janeth, Mojica, B., Mayorga Mogollón, Olga Lucía, Sierra Alarcón, Andrea Milena, Mancipe Muñoz, Edgar Augusto, Vargas Dominguez, Jahir, Afanador Téllez, Germán

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Las enfermedades del café: logros y desafíos para la caficultura colombiana del siglo XXI by Cadena Gómez, Gabriel, Gaitán Bustamante, Alvaro

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Determinación de la huella de carbono de una empresa forestal productora de guadua.El caso de la empresa Yarima Guadua, Eje Cafetero de Colombia by Arango Arango, Angela M., Camargo García, Juan C.

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Consideraciones sobre inventario y medición del bambú en bosques y plantaciones, con especial referencia a Guadua angustifolia en el Eje Cafetero de Colombia by Camargo García, Juan C., Arango Arango, Angela M.

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Diversidad de avifauna en paisajes rurales de la cuenca del río La Vieja, Eje Cafetero de Colombia by Sánchez Gómez, Elsa L., Camargo García, Juan C.

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Análisis detallado de sistemas productivos claves e indicadores a nivel regional en el contexto de crecimiento verde by International Center for Tropical Agriculture, CGIAR Research Program on Climate Change, Agriculture and Food Security, Centro de Estudios Regionales Cafeteros y Empresariales

“…According to the above, it becomes a priority to analyze the issues of agriculture and green growth in light of the particularities presented by each of the Colombian regions. This is how this report presents the result of the construction of green growth indicators at the regional level. …”
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Multi-Trait selection indices for identifying new cassava varieties adapted to the Caribbean Region of Colombia by León, Rommel, Rosero, Elvia Amparo, García, Jorge Luis, Morelo, Julio, Orozco, Alfonso, Silva, Gabriel, Ossa, Víctor de la, Correa, Ender, Cordero, Carina, Villalba, Leonardo, Belalcázar, John Eiver, Ceballos, Hernán

“…Sixteen genotypes were evaluated under four environmental conditions (localities) of the Colombian Caribbean region (Cereté, Carmen de Bolivar, Agustín Codazzi, and Sevilla), and two production cycles (2016/2017–2017/2018) in order to assess phenotypic expression of selected traits, their stability, and utility in genotype selection. …”
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In vitro methane production and ruminal fermentation parameters of tropical grasses and grass-legume associations commonly used for cattle feeding in the tropics by Uribe, Xiomara Gaviria, Bolívar Vergara, Diana M., Chirinda, Ngonidzashe, Molina Botero, Isabel Cristina, Mazabel, Johanna, Rosales, Rolando Barahona, Arango, Jacobo

“…In vitro study was carried out to measure methane (CH4) production and ruminal fermentation parameters of tropical forages either commonly used and with a potential for inclusion in Colombian livestock systems. The forages evaluated wereUrochloa hybrid cv. …”
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