Juan Carlos Suárez Salazar

Agronomy, Agricultural Plant Science, Forestry

BSc. MSc. Ph.D(c)
6.42

Publications

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    Faver Alvarez · Jairo Rojas · Juan Carlos Suárez Salazar

    Full-text · Article · Jan 2016
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    Gelber Rosas Patiño · Jader Muñoz Ramos · Juan Carlos Suárez Salazar

    Full-text · Article · Dec 2015 · Acta agronomica
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    ABSTRACT: En los municipios de Suaza y Timana se seleccionaron 55 lotes con diferentes rangos altitudinales, condiciones de manejo agronómico y beneficio, para evaluar la relación entre características químicas del suelo y manejo con los atributos sensoriales en taza. El método estadístico utilizado fue Análisis de Correspondencias Múltiples (ACM) y un análisis de PLS para determinar la relación entre los atributos sensoriales y las variables agronómicas de manejo y parámetros de suelo. Se encontro diferencias significativas (P
    Full-text · Article · Jul 2015
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    ABSTRACT: Este estudio tuvo como objetivo evaluar el crecimiento inicial de tres clones de caucho (Hevea brasiliensis) (FX 4098, FDR 5788, y el testigo IAN 873) en cuatro sistemas de siembra con copoazú (Theobroma grandiflorum) y plátano Hartón (Musa AAB) en dos localidades de Caquetá (Amazonia colombiana). En cada zona se siguió un diseño de bloques completos al azar con tres repeticiones y un arreglo en parcelas divididas, el cual se analizó mediante un modelo lineal general mixto. En los años 1 y 2 después del establecimiento del cultivo de caucho se evaluaron los índices de crecimiento: altura total (AT), circunferencia del tronco (CT), área de copa (AC) e índice de área foliar (IAF). CT fue la variable que más se correlacionó con los distintos índices de crecimiento (r ≥ 0.94). La variación temporal y clonal, así como el sistema de siembra implementado fueron los factores que más influyeron en los cuatro índices de crecimiento (p < 0.01). Solo hubo diferencias significativas entre las dos localidades para AC (p < 0.05). La interacción clon x sistema fue significativa para IAF (p < 0.01). Luego de 2 años, los mayores índices de crecimiento se observaron en el clon FX 4098 (AT = 4.43 m; CT = 13.00 cm; AC = 4.62 m2; IAF = 1.37), y en dos de los tres sistemas agroforestales (AT ≥ 4.08 m; CT ≥ 11.43 cm; AC ≥ 4.01 m2; IAF ≥ 1.54) en comparación con el sistema testigo (monocultivo).
    Full-text · Article · Jun 2015
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    Juan Carlos Suárez Salazar · Ervin Humprey Durán Bautista · Gelber Rosas Patiño
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    ABSTRACT: La densidad, riqueza y diversidad de la macrofauna edáfica son afectadas, entre otros factores, por la con-figuración de los agroecosistemas y la estacionalidad de la precipitación. Con el fin de evaluar estos efec-tos en mayo y noviembre de 2011, correspondientes a épocas de máxima y mínima precipitación, respecti-vamente, se realizaron estudios sobre la composición de la macrofauna edáfica asociada con los arreglos agroforestales ubicados en el Centro de Investigaciones Macagual Cesar Augusto Estrada González de Corpoica, Amazonia, Caquetá, Colombia. El experimento se dispuso en un diseño completo al azar bifac-torial con cuatro tratamientos (arreglos agroforestales: AB = abarco – Cariniana pyriformis; CH = caucho Hevea brasiliensis; CP = caucho-parica Schizolobium amazonicum Huber; UV = uvito Genipa Americana L.) y dos épocas (máxima y mínima precipitación), y cuatro repeticiones en parcelas divididas. Para explorar las relaciones entre los órdenes de macrofauna, se realizó un análisis de componentes principales y se evalúo el efecto de los arreglos agroforestales con una prueba de Monte Carlo. Los resultados mostraron que la densidad de la macrofauna fue mayor en el periodo de máxima precipitación (1129 individuos) en compa-ración con el de mínima (598 individuos). Los arreglos agroforestales influyen sobre la presencia o ausen-cia de algunos grupos taxonómicos (P < 0.05) como Homoptera (Insecta) y Raphidioptera (Insecta); ade-más los UV y AB pueden favorecer a la macrofauna del estrés por sequía.
    Full-text · Article · May 2015
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    Diana Maria Sanchez · Oscar Velandia · Juan Carlos Suárez Salazar

    Full-text · Article · Jan 2015
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    Katerine Angel · Magdy Pimentel · Juan Carlos Suárez Salazar

    Full-text · Article · Jul 2014 · Zootecnia Tropical
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    Full-text · Article · Jun 2014
  • Juan Carlos Suárez Salazar

    No preview · Article · Jan 2014
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    Juan Carlos Suárez Salazar

    Full-text · Article · Jan 2014
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    Faver Alvarez · Jairo Rojas · Juan Carlos Suárez Salazar

    Full-text · Article · Jun 2013
  • Juan Carlos Suárez Salazar
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    ABSTRACT: The work was conducted in the municipality of Rio Blanco, in order to perform profitability analysis in a traditional production systems and the integration of silvopastoral systems in dual purpose farms Matagalpa - Nicaragua. In the characterization phase of farms, by the method of cluster analysis found three types farms, Largs farms (Fl) farms medium (Fm) y small farms (Fs) which differed statistically (p <0.001) between groups for variables such as land area, area in pastures (improved and native) and availability of total workforce. Between types, milk production was 4.04, 3.98, 4.43 liters-1 cow-1 day-1,stocking rate of 1.37, 1.43 and 2.14 animals ha-1 and milk production per unit area was 1.65, 1.39 and 2.54 liters ha-1 day-1 to Fl, Fm and Fs, respectively. Among the most representative items within the cost structure for each of the farms were all kinds of food, followed by animal health and the demand for labor. An analysis per unit area shows that the gross margin per hectare is higher on small farms (Fs) due to supplementation presented systems based on forage which produces higher yields per unit area (US$ 75.42 Fl; US$ 42.38 Fm, US$127.72 Fs) the marginal cost of production of a liter of milk was 0.21, 0.225 and US$ 0.191 for Fl, Fm and Fs, respectively, with a higher value for Fs typologies of 0.097 per liter milk sold. Among the options of incorporating technologies silvopastoriles, is the model bank of protein for cutting and carried. The results of the financial analysis indicate that the use of forage for food in dual purpose cows were profitable, with a net present value (NPV) of incremental US$ $ 474 and an internal rate of return (IRR) of 22.32%. According to sensitivity analysis, with the reduction in price of milk was found that all models in the IRR was affected more significantly and in the case of cut and carry systems that are high labor. We found an effect between the supplementation of forage obtained from silvopastoral systems (protein banks) and the composition of milk varies between 3.55 to 4.02% in fat content, as well as the value of specific weight milk. Therefore, the technologies evaluated in this study are an alternative to improve production efficiency and profitability of farms of Rio Blanco by increasing net income and reducing the cost of milk production by reducing dependence on external inputs. Therefore the use of silvopastoral systems with improved pastures and cutting-carried contributes to improving the profitability of farms, compared with traditional management.
    No preview · Thesis · Dec 2008
  • Juan C Suárez · Bertha L Ramírez · Jaime E Velásquez
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    ABSTRACT: The use of fodder trees in agroforestry systems as protein banks used by cut and carry system has been seen as an alternative technology to maintain or improve animal productivity and sustainability. Therefore, we estimated biomass production of five forage species subject to cut and carry located on two soils in the Colombian Amazon piedmont. A design of complete blocks was used at random, with factorial adjustment 2 x 5 (2 types of landscape by 5 treatments) and 4 repetitions. The results showed a variability in the production of biomass in each component (P <0.05) because of the differences between each species and the site which were sown. The leaf component varied from 1.942 for Cratylia argentea to 73 g DM/plant for Thichantera gigantean. For the stem component, production varied from 1,116 to 28 g MS/plant for Cratylia argentea and Thichantera gigantea, respectively. The higher production of biomass was for Cratilia argentea, meanwhile Thichantera gigantea had the highest ratio of leaf-stem. We found high production of biomass on meson soil and among species the values of total biomass for the component leaf+ stem for one year, were for Cratylia argentea, Gliricidia sepium, and Clitoria fairchildiana.
    No preview · Article · Sep 2008 · Zootecnia Tropical
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    ABSTRACT: The tree cover in pastureland contribute to improve the animal productivity through reducing the heat stress, and also benefits the soil conservation and biodiversity. The objective of this study was to know the effects of tree crown cover on the availability of Brachiaria brizantha grass. A census of trees in 53 plots was taken out and there were selected the 12 most abundant in pastureland for monitoring the grass availability under the canopy and in open pasture. Also, there was determined the relationship between tree cover and grass availability. Beneath canopy the grass availability showed reductions between 4 and 97% when compared to open pasture, except for Acrocomia aculeata specie which was higher under canopy (9%). The grass availability was reduced according to increasing the tree crown cover in pastureland. It is concluded that grass availability under tree canopy varied among species and there was a good negative relationship between crown cover percentage and grass availability.
    No preview · Article · Sep 2008 · Zootecnia Tropical
  • Juan C Suárez Salazar · Juan E Carulla · Jaime E Velásquez
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    ABSTRACT: Actually, livestock production systems depend on low-quality foods, for which foliage of trees and shrubs can be used as an alternative fodder to supplement due to higher content of protein and minerals. This study assessed the chemical composition and nutritional value of Erithryna fusca, Clitoria fairchildiana, Trichanthera gigantean, and Cratylia argentea established in two soil types in the Colombian Amazonia piedmont. The chemical composition (crude protein-CP, neutral detergent fiber-NDF, acid detergent fiber-FAD) and in vitro digestibility were determined in fodder. The results showed a high variability (P<0.01) in quality due to the species and to the site which were sown. The contents of the PC, NDF, and ADF ranged from 15.51 to 22.42%, 49.27 to 78.64%, and 41.27 to 74.26%, respectively. The concentration of Ca and P ranged from 0.18 to 8.29%, and 0.21 to 0.47%, respectively. In vitro digestibility ranged from 17.47 to 46.92%, which is very low. Among species, Trichanthera gigantea stood out for its high quality. This species presented the highest DIVMS and Ca (44.46% and 7.16%) and the lowest contents of NDF (54.7%) and ADF (49.5%).
    No preview · Article · Sep 2008 · Zootecnia Tropical
  • Source
    Juan C. Suárez · Bertha L. Ramírez · Jaime E. Velásquez
    [Show abstract] [Hide abstract]
    ABSTRACT: The use of fodder trees in agroforestry systems as protein banks used by cut and carry system has been seen as an alternative technology to maintain or improve animal productivity and sustainability. Therefore, we estimated biomass production of five forage species subject to cut and carry located on two soils in the Colombian Amazon piedmont. A design of complete blocks was used at random, with factorial adjustment 2 x 5 (2 types of landscape by 5 treatments) and 4 repetitions. The results showed a variability in the production of biomass in each component (P <0.05) because of the differences between each species and the site which were sown. The leaf component varied from 1.942 for Cratyliaargentea to 73 g DM/plant for Thichantera gigantean. For the stem component, production varied from 1,116 to 28 g MS/plant for Cratylia argentea and Thichantera gigantea, respectively. The higher production of biomass was for Cratilia argentea, meanwhile Thichanteragigantea had the highest ratio of leaf-stem. We found high production of biomass on meson soil and among species the values of total biomass for the component leaf+ stem for one year, were for Cratylia argentea, GliricidiaSepium , and Clitoriafairchildiana .
    Preview · Article · Sep 2008
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The tree cover in pastureland contribute to improve the animal productivity through reducing the heat stress, and also benefits the soil conservation and biodiversity. The objective of this study was to know the effects of tree crown cover on the availability of Brachiaria brizantha grass. A census of trees in 53 plots was taken out and there were selected the 12 most abundant in pastureland for monitoring the grass availability under the canopy and in open pasture. Also, there was determined the relationship between tree cover and grass availability. Beneath canopy the grass availability showed reductions between 4 and 97% when compared to open pasture, except for Acrocomia aculeata specie which was higher under canopy (9%). The grass availability was reduced according to increasing the tree crown cover in pastureland. It is concluded that grass availability under tree canopy varied among species and there was a good negative relationship between crown cover percentage and grass availability.
    Full-text · Article · Sep 2008
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    R.H. Posada · L.A. Franco · C Ramos · L.S. Plazas · J.C. Suárez · F Alvarez
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    ABSTRACT: To evaluate the effects of soil physical and chemical factors (pH, conductivity, humidity, available phosphorus and organic matter) and environmental factors (temperature, relative air humidity, altitude and atmospheric pressure) on arbuscular mycorrhizal fungi (AMF)-Brachiaria decumbens grass relationship. Furthermore to establish patterns of microbiological responses that allow to differentiate the study sites in two relief types. Mycorrhizal characteristics (spore density, external hyphae and root colonizations by hyphae, vesicles and arbuscules), physical and chemical factors in soil and environmental factors were measured. The effect of physical, chemical and environmental factors on microbiological variables was related to the type of relief 'valley and hilly terrain'; the AMF behaviour was affected only over narrower ranges of evaluated variables. Similarly, the colonization of B. decumbens roots by AMF hyphae, vesicles and the mycorrhizal spore density follow different patterns according to the relief type. The type of relief is one of the factors to be taken into consideration to evaluate the AMF inoculum and root colonization of these pastures, because of the influence of slope - as physical property of soil - on AMF.
    Full-text · Article · Feb 2008 · Journal of Applied Microbiology
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    Juan C. Suárez Salazar · Juan E. Carulla · Jaime E. Velásquez
    [Show abstract] [Hide abstract]
    ABSTRACT: Actually, livestock production systems depend on low-quality foods, for which foliage of trees and shrubs can be used as an alternative fodder to supplement due to higher content of protein and minerals. This study assessed the chemical composition and nutritional value of Erithrynafusca , Clitoriafairchildiana , Trichanteragigantea , and Cratyliaargentea established in two soil types in the Colombian Amazonia piedmont. The chemical composition (crude protein-CP, neutral detergent fiber-NDF, acid detergent fiber-FAD) and in vitro digestibility were determined in fodder. The results showed a high variability (P<0.01) in quality due to the species and to the site which were sown. The contents of the PC, NDF, and ADF ranged from 15.51 to 22.42%, 49.27 to 78.64%, and 41.27 to 74.26%, respectively. The concentration of Ca and P ranged from 0.18 to 8.29%, and 0.21 to 0.47%, respectively. In vitro digestibility ranged from 17.47 to 46.92%, which is very low. Among species, Trichanthera gigantea stood out for its high quality. This species presented the highest DIVMS and Ca (44.46% and 7.16%) and the lowest contents of NDF (54.7%) and ADF (49.5%).
    Full-text · Article ·

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