Time filter

Source Type

Colonia Nicolas Bravo (Kilometro Noventa y Dos), Mexico

Mancillas R.G.,Colegio de Mexico | Lopez J.F.J.,Colegio de Postgraduados | Navarro L.A.A.,Colegio de Postgraduados | Hernandez B.R.,Popular University of Chontalpa | Pena A.G.,Colegio de Postgraduados
Investigaciones Geograficas | Year: 2015

The exponential growth of energy demand worldwide, the depletion of oil reserves and the severe pollutants problems caused by industry that favors greenhouse effect, evidence the need to increase the supply of oils for biodiesel production. This sets a new overview for studying non-edible oilseeds species. An alternative is barbados nut or piñon (Jatropha curcas) crop, perennial bush that is native from Mexico and Central America, grows in most of tropical countries, and it is considered like one of the non-conventional oilseed crops with great expectations for obtaining biodiesel. The barbados nut (Jatropha curcas) seeds have an outstanding characteristic: their high oil content allows converting it to liquid biofuel, and also the shell can be transformed into biogas and biofertilizers. Jatropha curcas is a green option to reforest degraded soils and to control erosion, as well as an option to diversify agricultural systems (crop rotation). On the other hand, in several scientific studies it is reported a wide variation in yields, due lack of study of plant's genetics, the agronomic handling, as well to the misunderstanding that exists in some countries in the field of zones with best agroecological ability to set the crop. The agroecological zoning (ZAE) refers to a division of land surface and weather into smaller units, that have similar characteristics related to its ability, potential yield and environmental impact. The aim of this paper is to define the zones with different agroecological abilities to set the Jatropha curcas crop, in the state of Tabasco. In order to accomplish this, four types of abilities were defined: optimal, proper, marginal by thermal or water deficit, and marginal by thermal or water excess. The agroecological zoning (ZAE) proposed in this paper defines zones based on combinations of soil, physiography, weather characteristics of temperature, rainfall and growth rate. An agroclimatic zoning is a zone with characteristics related to weather and crop systems, for our study the database of ERIC III (Extractor Rápido de Información Climatológica) was used, reporting for Tabasco a total of 93 meteorological stations. Nevertheless, only 35 stations were selected, since the other had inconsistencies in their information. From those 35 stations, a weather database was created, considering the information of historical series in a daily basis, like minimum and maximum temperatures, rainfall and evaporation (1950-2003 period). The edaphoclimatic zoning consisted in assessing the soil resource based in the units and subdivisions of soil from FAO/UNESCO system. In order to fulfill the zoning, cartographic data of soils subunits was consolidated, including texture, slope, soil depth, and its fertility, whose edaphological properties were compared to FAO's Jatropha curcas crop requirements and optimal level was assigned. The tool used for cartography elaboration was ArcMap GIS Software, which consists of computer mapping system that relates locations with agroclimatic information equal to Jatropha curcas crop requirements, which were defined like areas with ability, and according to this maps were prepared at a scale of 1:250 000 of every climatic element. The interpolation for the calculation of isolines was made by Kriging method, embedded within ArcMap software, which ease the handling and superposition of theme information layers of weather and soil. The yearly average analysis of temperature corroborated that whole Tabasco state has optimal ability and the rainfall analysis showed a surface of 2 229 631 ha with optimal ability. About soil resource there were detected 37 subunits of soil with optimal ability, adding a surface of 945 462 ha. After analyzing the maps between optimal characteristic abilities (temperature, rainfall and growth rate) and edaphological, there were detected 833 181 ha with optmial agroecological ability, therefore in the state of Tabasco is feasible the crop of this oilseed to produce biofuels.

Hernandez-Rivera M.A.,Juarez Autonomous University of Tabasco | Ojeda-Morales M.E.,Juarez Autonomous University of Tabasco | Martinez-Vazquez J.G.,University of Atacama | Villegas-Cornelio V.M.,Popular University of Chontalpa | Cordova-Bautista Y.,Juarez Autonomous University of Tabasco
Journal of Soil Science and Plant Nutrition | Year: 2011

In México, there are extensive areas polluted by oil spills. Currently, bioremediation technologies have been developed, using microorganisms to clean up oil sites. In this study, we evaluated the development of a hydrocarbonoclastic bacterial strain, using a completely randomized 3×3×4 factor arrangement: three temperatures, three pH, and four nutrients. We collected samples of soil contaminated with 3.45 × 10 5 mg kg -1 (345,000 ppm) Total Petroleum Hydrocarbons (TPH), located at the Ejido José N. Rovirosa, Huimanguillo, Tabasco, México. The samples were grown in a culture medium Nutrient Agar (NA), obtaining a bacterial strain, which was characterized and classified as Proteus sp. The strain was grown in a combined carbon culture medium and then in a liquid mineral medium with crude oil as sole carbon source. Analysis of variance and mean test were performed, using the SPSS-11.0 statistical software. The microorganisms showed the highest population growth in the treatment N 2=Triple17pH1=4.0T1=29°C with a value of 4.6 × 10 10 CFU mL -1. To reach, by bioaugmentation, the same development of Proteus sp in a conditioned soil would allow us to implement a potential bioremediation strategy for solving the problem of soils contaminated with hydrocarbons in the state of Tabasco in particular, and in Mexico in general.

Izquierdo-Hernandez J.,Colegio de Mexico | Salgado-Garcia S.,Colegio de Mexico | C. Lagunes-Espinoza L.D.,Colegio de Mexico | Palma-Lopez D.J.,Colegio de Mexico | And 3 more authors.
Sugar Tech | Year: 2016

In order to assess the nutritional and physiological response of sugarcane varieties COLPOSCTMEX 05-223, COLPOSCTMEX 06-039, RD 75-11, COLPOSCTMEX 06-271, MEX 69-290, COLPOSCTMEX 06-2362, MEX 68-P-23 COLPOSCTMEX 472, ATEMEX 96-40 and CP 72-1210 to nitrogen doses of 0, 120 and 180 kg ha−1, foliar N, P and K, chlorophyll content, photosynthesis rate (A), transpiration rate (E) and stomatal conductance (gs) were recorded for 150 days. The study was conducted in fields of sugar factory Azsuremex (IA), Tabasco, Mexico, during the growing season of 2014/2015, under rainfed conditions with Haplic (silty–eutric–calcaric) Cambisol. No variation was observed among the sugarcane varieties studied, in terms of the nitrogen doses applied, foliar N and P. Foliar K concentrations were deficient in all varieties (0.55–0.80 %). The dose of nitrogen did not affect chlorophyll concentration or photosynthesis rate in any variety, but it had an effect on gs and E. Under conditions of increasing photosynthetically active radiation, the variety ATEMEX 96-40 was performed better than the varieties COLPOSCTMEX 05-223 and RD75-11B in terms of A, gs, internal CO2 concentration (Ci) and transpiration rate (E). © 2016 Society for Sugar Research & Promotion

Aranda E.M.,Colegio de Mexico | Georgana L.E.,Popular University of Chontalpa | Ramos J.A.,Colegio de Mexico | Salgado S.,Colegio de Mexico
Cuban Journal of Agricultural Science | Year: 2012

In order to evaluate the efficiency in the synthesis of microbial protein in a feed based on sugarcane with different levels of Mexican zeolite (Clinoptilolita calcica), an experiment was designed with ground stems of the Mex69-290 sugarcane cultivar, of twelve months of age. Urea (1.5 %), ammonium sulfate (0.3 %), mineral salts (0.5 %), and inoculum of lactobacilli (Vitafert) (10 %) were mixed homogeneously. Ten kilograms of the mixture were spread on the floor, with layer thickness of 10 cm. The mixture was subject to constant aeration and it was fermented under shade. A complete random design was used with factorial fit, four levels of zeolite (0, 1, 2, 3 %) and five fermentation times (0, 24, 48, 72, 96 h), with four repetitions per treatment. Nutritional variables were measured: dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), digestibility and fermentation variables, pH, NH3, acetic, propionic, butyric, and lactic acids, and the temperature. The CP at 24 h was from 16 to 21%, according to the treatment, and it decreased at the end of the fermentation. There was increasing synthesis of microbial protein, not having effect due to the addition of zeolite. The digestibility was of 50 to 60 %, without any effect due to the zeolite addition. The DM values were of 37 and 44 %, at 72 y 96 h, respectively. At the beginning, the pH was acid, and, at the end, alkaline, due to the production of lactic acid, volatile fatty acids, and ammonium. The maximum temperature was of 45 °C at 24 h. It was concluded that the zeolite had no effect on the production of microbial protein. The process of sugarcane fermentation in solid state increased the synthesis of microbial protein. After 48 h, the pH was alkaline, and at 24 h it reached the maximum temperature.

Villarreal-Ibarra E.C.,Popular University of Chontalpa | Del Carmen Lagunes-Espinoza L.,Colegio de Mexico | Lopez P.A.,Colegio de Mexico | Garcia-Lopez E.,Colegio de Mexico | And 3 more authors.
Boletin Latinoamericano y del Caribe de Plantas Medicinales y Aromaticas | Year: 2015

Because of the increase of chronic degenerative diseases, such as Diabetes Mellitus (DM), it is necessary and indispensable to carry out pharmacological studies in order to identify and to evaluate plant species that are used in regional traditional medicine for empirical control of DM. Results of an ethnopharmacological research on Mexican plants used for empirical control of DM in a community at the southeast of Mexico are presented in this study. Information was obtained from people at a community of Tabasco, Mexico by means of applying a TRAMIL structured interview, and by reviewing herbarium specimens. A total of 36 plant species that are used in the community to control the DM was found, all of those species are known by one or more local names. Botanical families with more species mentioned by people are Fabaceae, Asteraceae, Cucurbitaceae, Meliaceae and Poaceae. On the basis of their high TRAMIL significant use (TSU), five plant species are distinguished for local DM control, and two of them are the most important: Tradescanthia spathacea Sw. and Manilkara zapota (L.) P. Royen. The importance of using those species in the community emphasizes the need to initiate pharmacological studies on the hypoglycemic activity of them. © 2015.

Discover hidden collaborations