Navegando por Autor "Salazar, Juan Carlos Suárez"

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Efecto de las condiciones de cultivo, las características químicas del suelo y el manejo de grano en los atributos sensoriales de café (Coffea arabica L.) en taza
(Universidad Nacional de Colombia, 2015) Salazar, Juan Carlos Suárez; Burgos, Engelberto Rodríguez; Bautista, Ervin Humprey Duran
En 54 fincas cultivadas con café (Coffea arabica L.) en rangos altitudinales, características de plantación y formas de beneficio del fruto diferentes, en los municipios de Suaza y Timaná (Departamento del Huila), Colombia, se evaluaron la relación entre estas variables de cultivo y manejo con los atributos sensoriales en taza. Para el estu dio fueron utilizados el método estadístico Análisis de Correspondencias Múltiples (ACM) y Partial Least Square (PLS) para determinar la relación entre los atributos sensoriales y las características del suelo y de manejo de la plantación. A través del análisis de varianza multivariado mediante la prueba de Hotelling se encontraron diferen cias (P < 0.001) para pH, Ca, Mg, Na, saturación de bases (SB), Al, P, Zn, así mismo, se observaron diferencias (P < 0.01) para K, Mn, M.O y B entre los tipos de suelos. En general, el perfil de las tazas fueron de cuerpo medio, algunas ácidas e intermedias con atributos sensoriales representativos. La calidad de taza Q3 se relacionó con atributos sensoriales como cuerpo, dulzor, balance, sabor, acidez y estos con variables de características de la plantación como densidad de siembra (Ds), edad, altura y elementos químicos con azufre (S). Q2 fue una taza afectada por el tiempo de la fermentación (horas) y por variables químicas como pH, SB, Ca, Mg además variables de manejo como sombra, la cual depende de la altura del sitio en el cual se encuentra el cultivo. Q1, que presentó baja calificación en los atributos sensoriales, se relacionó con variables del suelo como Al y Fe.
Minority compounds and sensory analysis evaluation of Coffea arabica var. caturra cultivated in three different altitudinal ranges
(Universidad Nacional de Colombia, 2017) Bolivar, Jennifer Tatiana Cruz; Pérez, Wilson Rodríguez; Salazar, Juan Carlos Suárez; Espinosa, Claudia Mercedes Ordoñez; Cano, Gustavo Adolfo Vega
The composition of minority compounds in samples of roasted and ground coffee (Coffea arabica var. caturra) cultivated in three altitudinal ranges 1300-1400, 1400-1600, 1600-1800 m. a. s. l., in the Huila department of Colombia were determined. The samples were collected in July of 2012. pH, total acidity and total lipids were measured. Subsequently, the composition of total lipids after esterification and gas chromatography analysis coupled to high resolution mass spectrometry (GC-MS) was established. Quality cup test considering the following attributes: fragrance/aroma, taste, residual flavor, acidity, body, uniformity, balance, clean cup, sweetness, quality and note, were performed. No statistically significant difference (p <0.05) in pH, titratable acidity, total time of roasting and cracking time was determined. Significant difference was found in% humidity range: 1300-1400 m relative to the ranges: 1400-1600 and 1600-800 meters. As for the major compounds are predominantly: stigmasterol, sitosterol, 4-methylpentanamide and 2- (2-hydroxyphenyl) buta-1,3-diene, in the altitudinal ranges evaluated. No significant difference (p>0.05) was found in the evaluated attributes at the quality cup test at different altitudinal range.
Soil macrofauna and edaphic properties in coffee production systems in southern Colombia
(Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro, 2019) Suárez, Leonardo Rodríguez; Pinto, Sandra Patricia Cuarán; Salazar, Juan Carlos Suárez
The objective of this study was to evaluate the occurrence of the soil macrofauna in coffee production systems, as well as their relationship with edaphic properties. Therefore, two coffee production systems were selected: coffee plantations at full-sun with conventional management (Intensive) and shaded coffee plantations with organic management (Traditional). In each crop system, three soil samples were collected randomly, in the form of blocks (25 × 25 cm), to a soil depth of 10 cm. In total, 17,109 individuals were recorded in this study being the Oligochaeta group the most representative, regardless of the coffee production system. The average density of soil macrofauna was higher in traditional coffee plantations (p < 0.05) due to the higher density of Oligochaeta, Diplopoda and Blattodea. The traditional coffee plantations provided a better soil chemical fertility reflected in the principal component analysis. Furthermore, these Chemical attributes probably could affect the occurrence of the soil macrofauna groups.