Revista de Investigación Agraria y Ambiental

5-6

Authors: Adriana Maldonado Chaparro

La Revista de Investigación Agraria y Ambiental es una publicación realizada por la Escuela de Ciencias Agrícolas, Pecuarias y del Medio Ambiente de la Universidad Nacional Abierta y a Distancia. Fue concebida en el año 2008 como resultado de la iniciativa de los académicos de la Universidad, para dar visibilidad a los trabajos de investigación desarrollados por los docentes de la Escuela. En su momento, la revista estuvo a cargo del Dr. Edwin Páez, quien como Editor logró consolidar la primera política editorial y recibió los primeros manuscritos sometidos, algunos de los cuales han nutrido este primer número de la revista. En el año 2009, la revista es sometida a una reestructuración interna, que tiene como consecuencia el replanteamiento de la política editorial, para incorporar algunos de los estándares internacionales propios de las publicaciones seriadas y se consolidaron los diferentes comités responsables de la orientación académica, científica y administrativa, así como el sistema de pares evaluadores a través del cual cumpliremos con los estándares exigidos por los sistemas internacionales de indexación, como Publindex y Latindex.De esta forma buscamos la calidad científica de las contribuciones para mejorar el estándar y prestigio de nuestra publicación.

13-22

Authors: Miguel Ángel Landines Parra & Jorge Andrés Zambrano Navarrete

Aquaculture industry has sustained its development on the use of products obtained from marine fish species. Main industrial products in this field are both the flour and fish oil, which have a high nutritional and economic value. Fish oil has been found to be a scarce raw material, which has a high content of polyunsaturated fatty acids (PUFA n-3) and has been classified as a functional food because of the benefits they bring on the consumer’s health. Paradoxically, high PUFA n-3 content makes the fish oil highly susceptible to the autooxidation processes that lead to the transformation of PUFA N-3 in peroxides, aldehydes, ketones and polymers that are responsible for oxidative cell damage. In this document we explore the processes in which primary and secondary products are generated through oxidation, and the protection mechanisms against oxidative damage and the negative effect of primary and secondary products of lipid autoxidation on nutritional quality of balanced feeds, fish health and quality of meat products for human consumption.

29-36

Authors: Oscar Alejandro Flórez,Héctor Fabio Marín & José Agener Zapata

The quality of papaya fruits during its growth and commercialization is affected by diseases as Antracnose (Colletotrichum gloeosporioides) and papaya ringspot potyvirus (PRSV). We identified and analyzed harvest and posharvest practices of papaya (Carica papaya cv. Maradol) in the Colombian Department of Huila in order to establish some causes of losses through the productive chain. We carried out an exploratory investigation to characterize some links of the productive chain of papaya: producers, transporters, dealers and consumers. People in this survey prefer to consume papaya Maradol, although 35% of the consumers do not distinguish the papaya varieties. Quality concept in not applied in a cross-sectional way so inappropriate practices are applied. Because of this, the implementation of both harvest and postharvest good practices is fundamental in order to preserve the quality of the fruit, which allows a reduction in the postharvest losses and brings the consumer a better product.

41-47

Authors: Luz Adriana Giraldo C., Héctor Fabio Ríos O. & Manuel Francisco Polanco

One of the alternatives to prevent and control erosion of soils is bioengineering, where trees are used to increase the resistance of the soil. Most of those trees are propagated from stakes. Nevertheless, since formatting new roots from vegetative parts is not easy, it is necessary to use rooting inducing substances. We evaluate rooting two rooting of three tree species, “matarratón” (Gliricidia sepium), “nacedero” (Trichanthera gigantea) and “willow” (Salix humboldtiana). The research work was carried out in of Dosquebradas, Risaralda at 1450 m. We applied a chemical rooting inducer (Hormonagro®) and a natural rooting inducer (extract of Aloe vera) and a control treatment with no inducers. Our results indicate that rooting was improved by the addition of a stimulator. A. vera improved the rooting of the three species, being far better on S. humboldtiana, 60 days after the application. T. gigantea did not show significant differences related with application of rooting inducers. The tolerance of the species to the excess of humidity in the substrate, S. humboldtiana was more tolerant whereas T. gigantea had the major rotting problems due to the excess of water