Valdano Tafur

En este trabajo se hace enfasis al estudio realizado sobre los estudiantes de los primeros anos de la Carrera de Ingenieria Agronomica en la Universidad Central del Ecuador, con el objetivo de determinar en forma cientifica su estado metacognitivo respecto a los estilos de aprendizaje de las materias que se imparten en las Ciencias Basicas de la Carrera como son: fisica quimica, matematica y biologia, utilizando en la recoleccion de la informacion el test de estilos de aprendizaje propuesto por Cabrera (2004) en su tesis doctoral.

Con e lobjetivod e te r m i n a r e l e fe c tode l a a pl ic ac i onde f e rtil iz a nteo r g a ni c odeo r i g e nm i c ro a l g a l s obre la g e rmin ac iony e l c r ec i m ientodeplantulasde a lb a h ac a ( O c imumbasil i c um L )v a r i e d a dHojade L e c hug a , se ins t a loun e ns a y o e n e lC e ntrode B io l o g ia, Univ e rsid a dC e ntr a ld e lE c u a dor. L ostr a t a m i e ntos c onsist i e ron e n a dicion a rfertil iz a nteo r g a nicol i quido e ndosp r op o r c io n e s a l a g u a d e c a dari e g o(50y 100 % )y untest i g o a bs o lu t o.Eldisenode e x p e r i mentofue e nbloques a l a z a r c ontr e str a tamien t osy 9 r e p e t i c iones. L a s v a r i a b les e v a luad a sfu e ron: t a sa y p o rc e ntaje deg e r m i n ac ion; a l t u r a depl a ntu l a s, lon g i t udde r a i z ,p e sos e c odelap a rte a e reaydelar a i z . Enlata s adeg e r m ina c iony a l t u r a d eplant u lasno se e n c ontro e fe c tosi g ni f ic a t i vo c onla a pl i cac ionde...

Correspondence and Reprint Requests: Sebastián Yánez Received: O c t o b e r , 1 5 2 0 1 7 | Accepted: N o v e m b e r , 6 2 0 1 7 | Published Online: D e c e m b e r , 2 8 2 0 1 7 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (creativecommons.org/licenses/by/3.0) Conflict of interest: None declared | Abstract Herbivorous insects in pastures of alfalfa(MedicagosativaL.), influence growth and crop plant health. Noone really knows phytophagous interaction with the predatorand the host.AphiscraccivoraKoch, Aphis fabaeScop. and Aphis gossypiiGlover. are conducting phytophagyinalfalfa. The phonological stages were studied, Mv: mean vegetative and Lv: Vegetative late. Different ranges of significance in the study of the cumulative number of total budsper plant regardless of the phenological stage. The average range was 3.26+0.28to19.4 + 0.21. The height of the plant has linear trend. In Mv was: y = 0.1936x+10.58 and Lv: y = 0.2784x+...

Este artículo analiza los factores socioeconómicos que influyen en la diversidad de cultivos a nivel de finca y la probabilidad de adopción del monocultivo entre hogares rurales de la provincia de Esmeraldas. Con datos de una encuesta de hogar (n=226) levantada en octubre de 2020 y por medio de técnicas de análisis multivariado, se pudo determinar que los hogares con jefes que ostentan educación superior, reciben ingresos no agrícolas, no reciben el Bono de Desarrollo Humano y gastan más en insumos agrícolas, tienen menor diversidad de cultivos en sus fincas. Por otra parte, los hogares con mayores niveles de educación, que tienen de mayores extensiones de tierra propia, invierten más en insumos agrícolas y han sido beneficiarios de crédito, son más propensos a adoptar el monocultivo como forma de producción. Las implicaciones de estos hallazgos para las políticas públicas se abordan en la sección de conclusiones

The Forest Law of Ecuador consists of 107 articles, whereas its regulations contain 269 articles. They are related to forestry resources, forestry patrimony protection, forests and vegetation, forest production and benefits, the control and mobilization of the forestry resources, research and capacitation, and the forestry industry protection; to natural areas, wild flora and fauna, their patrimony, conservation, and economic support; and to the violation of the law and its judgment.

Off-farm employment in rural households has been cited in the literature as a potentially ideal alternative to reduce forest clearing and pressure on natural resources, since it provides income while at the same time taking household labor away from the farm. Nonetheless, empirical research on the relationship between off-farm work and natural resource use is still scarce. This paper examines the impact of off-farm work on forest clearing, logging, hunting, and fishing among both migrant colonists and indigenous populations in the Ecuadorian Amazon. In contrast to prior research, we use an instrumental variable approach to control for the potential endogeneity of off-farm work with respect to natural resource use. The results indicate that the higher the number of days worked off-farm at the household level, the lower the forest clearing. On the other hand, the number of days worked off-farm has no effect on logging, hunting, and fishing. The implications of this for sustainable dev...

Off-farm employment in rural households has been cited in the literature as a potentially ideal alternative to reduce forest clearing and pressure on natural resources, since it provides income while at the same time taking household labor away from the farm. Nonetheless, empirical research on the relationship between off-farm work and natural resource use is still scarce. This paper examines the impact of off-farm work on forest clearing, logging, hunting, and fishing among both migrant colonists and indigenous populations in the Ecuadorian Amazon. In contrast to prior research, we use an instrumental variable approach to control for the potential endogeneity of off-farm work with respect to natural resource use. The results indicate that the higher the number of days worked off-farm at the household level, the lower the forest clearing. On the other hand, the number of days worked off-farm has no effect on logging, hunting, and fishing. The implications of this for sustainable dev...

Este artículo analiza el efecto del 1-Meticlciclpropeno en la inhibición de etileno en el fruto de babaco (Vasconcellea x heilbornii var. Pentagona) en tres estados de madurez del fruto y tres tiempos de exposición. Se empleó un Diseño Completamente al Azar (DCA) con cuatro repeticiones. Las variables bajo estudio fueron: la pérdida de peso, la firmeza, la concentración total de sólidos solubles y el porcentaje de acidez titulable. La menor pérdida de peso se registró para frutos cosechados de forma temprana (color “Verde”) y expuestos al 1-Meticlciclpropeno por un período corto (7 días). En el caso de la variable firmeza de fruto, los mejores resultados se obtuvieron al cosechar los frutos cuando estos se cosechan en estado “Verde”. La concentración de sólidos solubles fue mayor para los frutos cosechados en estado “Verde-Amarillo” y “Amarillo”, mientras que los valores de porcentaje de acidez titulable se incrementan con la madurez del fruto. El tiempo de inmersión no tuvo efectos...

En la presente investigación se diseñaron las técnicas para la propagación de tejido meristemático presente en las yemas de la especie Scoparia dulcis L, (Scrophulariaceae), obteniendose plántulas genéticamente idénticas a la planta madre. Esta práctica permite reducir el espacio y el tiempo necesario para el cultivo de la planta. Con el protocolo desarrollado se podrá obtener especímenes de alto rendimiento en principios activos y libres de agentes infecciosos, especialmente en la producción de material requerido en la elaboración de productos medicinales. La especie en estudio ha sido referida con propiedades antimaláricas, entre sus componente químicos esta el beta sitosterol utilizado como desinflamante de la próstata y elemento básico para tratamientos de la calvicie. Para desarrollar el cultivo in vitro se definió primero el método para desinfección de explantes de bacterias y hongos; para lo cual se ensayaron los tiempos de exposición de los explantes en hipoclorito de sodio ...

PHENOLOGICAL AND PRODUCTIVE STUDY OF NINE VARIETIES OF ROSE (Rosa sp.), IN THE THIRD AND FOURTH PRODUCTION CYCLE IN CAYAMBE.
SUMMARY
In the Flower Company "Ponte Tresa Inversiones SA" located at Cayambe, Pichincha, was evaluated phenological and productive growth of nine varieties of rose (Rosa sp.), Explorer, Freedom, Green Tea, High & Orange Magic, High & Yellow Magic, Mondial was evaluated, Tibet, Titanic and Topaz, in third and fourth production cycle. For statistical validation tests of significance, was used test "t" of student and Chi-square (chi-square), with 30 observations per variety. The variables evaluated were: stem length and diameter (cm) long flower bud (cm), days to sprouting, days to flowering, number of harvested stems and productivity. The best results in the fourth production cycle (wet season), in the varieties: Explorer, with average height 92.8 cm; High Yellow Magic, with 0.78 cm in diameter; Titanic with button size 6.89 cm long; Green Tea, with 9.96 days of sprouting; Tibet 45.65 days to flowering; Titanic with 52.8 stems of productivity.

KEYWORDS: FLOWERING.  FLORICULTURE. ORNAMENTAL.  ROSACEAE.

In order to decontaminate urban areas, plants with a large capacity for CO2 absorption must be used. For this purpose, the Jacaranda (Jacaranda mimosifolia D. Don.) Is the most prominent species. Micropropagation techniques were used to obtain seedlings, capsules , The seeds were extracted, washed, disinfected and germinated in Murashige & Skoog culture media at half the salt concentration (MS ½) and Woody Plant Medium (WPM).

At 8 days of germination, the epichyles obtained were cultivated in the Murashige & Skoog media at half the concentration (MS ½) and Woody Plant Medium (WPM), to which different concentrations of 6-benzylaminopurine (BAP) To obtain aerial shoots. After 30 days, the outbreaks obtained were subcultured in the MS ½ and WPM media added with indolebutyric acid (IBA) to achieve rooting. Acclimatization was carried out in a greenhouse, where the roots of the explants were washed with water to remove the agar, then transplanted into polyethylene sheaths which contained a substrate composed of two parts of black soil and a part of sand Covered with plastic cups and watered continuously. In the statistical part, a completely random design was used with factorial 2 x 4 with five observations; it was found that for budding WPM + 0.9 ppm BAP obtained shoots in less time and greater length; For rooting WPM + 0.0 ppm IBA obtained the highest percentage of rooting and length of roots, with this technique allowed to obtain plants at a cost of USD 0.42 / plant.

KEY WORDS: REFORESTATION, FOREST SPECIES MICROPROPAGATION, EXPLANTS, HORMONE, SPROUTING, ROOTING.

In the Flower Company "Ponte Tresa Inversiones SA" located at Cayambe, Pichincha, was evaluated phenological and productive growth of nine varieties of rose (Rosa sp.), Explorer, Freedom, Green Tea, High & Orange Magic, High & Yellow Magic, Mondial was evaluated, Tibet, Titanic and Topaz, in third and fourth production cycle. For statistical validation tests of significance, was used test "t" of student and Chi-square (chi-square), with 30 observations per variety. The variables evaluated were: stem length and diameter (cm) long flower bud (cm), days to sprouting, days to flowering, number of harvested stems and productivity. The best results in the fourth production cycle (wet season), in the varieties: Explorer, with average height 92.8 cm; High Yellow Magic, with 0.78 cm in diameter; Titanic with button size 6.89 cm long; Green Tea, with 9.96 days of sprouting; Tibet 45.65 days to flowering; Titanic with 52.8 stems of productivity.