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      Agronomic response of forage mixtures in a silvopastoral system in the Colombian dry tropics Translated title: Respuesta agronómica de mezclas forrajeras en un sistema silvopastoril de trópico seco colombiano


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          Abstract Mixtures of forage grasses and legumes were established on 9.7 ha, using the following treatments: Brachiaria hybrida cv. Cayman, Brachiaria hybrida cv. Toledo, Panicum maximum cv. Mombaza, Brachiaria hybrida cv. Cayman + C. brasiliensis, Brachiaria hybrida cv. Toledo + C. brasiliensis, Panicum maximum cv. Mombaza + C. brasiliensis. The following variables were evaluated: vigor, height of the plant, coverage, incidence of pests and diseases at the four-week mark and production of forage and dry matter were recorded at the six-week mark. Statistical differences were found for plant height, which evidenced which of the treatments behaved best in terms of growth. Non-combined treatments were found to perform best for the production of dry matter variable. C. brasiliensis contributes to the growth of the combined grasses during the first four weeks of establishment, but after this time the legume begins to compete for space and light, affecting the development of the other forage species.

          Translated abstract

          Resumen Se establecieron 9,7 ha, en asociación de gramíneas y leguminosas forrajeras utilizando los siguientes tratamientos: Brachiaria hibrido cv Cayman, Brachiaria hibrido cv Toledo, Panicum maximum cv. Mombaza, Brachiaria hibrido cv Cayman + C. brasiliensis, Brachiaria hibrido cv Toledo + C. brasiliensis, Panicum maximum cv Mombaza + C. brasiliensis, evaluándose las variables de vigor, altura de la planta, cobertura, incidencia de plagas y enfermedades a la cuarta semana y en la sexta semana se registraron valores de producción de forraje y materia seca de las asociaciones. Se encontraron diferencias estadísticas para altura, evidenciado mejor comportamiento en los tratamientos asociados; mientras que la variable de producción de materia los tratamientos sin asociación presentaron altos valores. C. brasiliensis contribuye al crecimiento de las gramíneas asociadas durante las cuatro primeras semanas de establecimiento, después de este tiempo la leguminosa inicia proceso de competencia por espacio, afectando el desarrollo de la otra especie forrajera.

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          Most cited references 16

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          Photoreceptor effects on plant biomass, resource allocation, and metabolic state.

          Plants sense the light environment through an ensemble of photoreceptors. Members of the phytochrome class of light receptors are known to play a critical role in seedling establishment, and are among the best-characterized plant signaling components. Phytochromes also regulate adult plant growth; however, our knowledge of this process is rather fragmented. This study demonstrates that phytochrome controls carbon allocation and biomass production in the developing plant. Phytochrome mutants have a reduced CO2 uptake, yet overaccumulate daytime sucrose and starch. This finding suggests that even though carbon fixation is impeded, the available carbon resources are not fully used for growth during the day. Supporting this notion, phytochrome depletion alters the proportion of day:night growth. In addition, phytochrome loss leads to sizeable reductions in overall growth, dry weight, total protein levels, and the expression of CELLULOSE SYNTHASE-LIKE genes. Because cellulose and protein are major constituents of plant biomass, our data point to an important role for phytochrome in regulating these fundamental components of plant productivity. We show that phytochrome loss impacts core metabolism, leading to elevated levels of tricarboxylic acid cycle intermediates, amino acids, sugar derivatives, and notably the stress metabolites proline and raffinose. Furthermore, the already growth-retarded phytochrome mutants are less responsive to growth-inhibiting abiotic stresses and have elevated expression of stress marker genes. This coordinated response appears to divert resources from energetically costly biomass production to improve resilience. In nature, this strategy may be activated in phytochrome-disabling, vegetation-dense habitats to enhance survival in potentially resource-limiting conditions.
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            Brachiaria hybrids: potential, forage use and seed yield

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              Nitrogen status of functionally different forage species explains resistance to severe drought and post-drought overcompensation


                Author and article information

                Dyna rev.fac.nac.minas
                Universidad Nacional de Colombia (Medellín, Antioquia, Colombia )
                June 2020
                : 87
                : 213
                : 80-84
                [1] Valle del Cauca orgnameUniversidad del Cauca orgdiv1Facultad de Ciencias Agrarias orgdiv2Grupo de Investigación Nutrición Agropecuaria Colombia carlosmartinez@ 123456unicauca.edu.co
                S0012-73532020000200080 S0012-7353(20)08721300080

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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