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Articles by E. Guevara
Total Records ( 3 ) for E. Guevara
  N. De la Cruz-Landero , V.E. Hernandez , E. Guevara , M.A. Lopez-Lopez , A.T. Santos , E. Ojeda-Trejo and A. Alderete-Chavez
  Phytoremediation uses the survival capacity of certain plant species in environments contaminated with heavy metals to extract such metals. The objective of this study was to evaluate the response of Lupinus versicolor as a biological agent in soils contaminated with Cu, Pb, Cd, Ni and Zn. The present study was conducted in a greenhouse. The experimental design was a completely randomized block with 6 replications. Results showed that the plants accumulated as much as 0.12 mg kg-1 of Cu within foliage, 0.94 mg kg-1 of Pb within stems, 0.31 mg kg-1 of Cd within stems, 1.03 mg kg-1 of Ni within stems and 2.46 mg kg-1 of Zn within the leaves, being these values higher than those found by other researchers. In this experiment, favorable results were obtained for the accumulation of Cd in the leaves, Ni in the stems and Cu in the roots. Therefore, based on the results obtained, L. versicolor is a plant that can be considered as a good alternative for removing heavy metals in contaminated soils and for the phytostabilization and revegetation of contaminated soils.
  A. Alderete-Chavez , J.J. Guerra-Santos , N. De la Cruz-Landero , R. Brito , E. Guevara , R. Gelabert , E. Nunez , E. Endanu and L.E. Amador-del Angel
  The present research was carried out to explore the ability of Clitoria ternatea to incorporate nutrients into soils. There are just few studies about native species in Mexico. Clitoria plays an important ecological role by providing favorable conditions for soil restoration in forest areas after forest fires occurrence. In agriculture, Clitoria species affect soil acidification and nutrient solubilization. Data about the performance of Clitoria species and the characterization of its behavior during the growing cycle and the extraction of some nutrients like Nitrogen (N), Phosphorus (P) and Potassium (K) is not available. An experiment using a completely randomized design with six replications was conducted under natural conditions in Carmen Island. Results showed that C. ternatea is able to increase the levels of N, P and K in the soil during the period of growth.
  A. Alderete- Chavez , L. Aguilar-Marin , N. De la Cruz-Landero , J.J. Guerra-Santos , R. Brito , E. Guevara and R. Gelabert
  This study was conducted to determine the effectiveness of scarification treatments in the germination of Crotalaria retusa to propose an effective and practical method for breaking seed dormancy. Seeds were collected on December 2009 from disturbed forests in coastal dunes and tested with different times of exposure (0, 5, 10, 20 and 30 min) to sulfuric acid immersion on February 2010, assays were done in the Seed laboratory of Natural Sciences Faculty a day/night regime of 32/18°C was taken into consideration along with a 12 h photoperiod. The germination was observed daily early in the morning for a period 30 days. All the treatments initiated their germination three days after the start of the experiment and reached their maximum value between the days twenty-six and twenty-nine. Seeds treated with sulphuric acid, responded positively in all cases but, the immersion in acid for thirty or twenty minutes were the treatment that gave the best results, for purposes of re-colonization in forest areas is recommended the use of these treatment.
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