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Articles by E. Ojeda-Trejo
Total Records ( 3 ) for E. Ojeda-Trejo
  A. Alderete-Chavez , D.A. Rodriguez-Trejo , V. Espinosa-Hernandez , E. Ojeda-Trejo and N. de la Cruz-Landero
  This study was conducted to determine the effectiveness of scarification treatments in the germination of Lupinus leptophyllus Schlecht and Cham; seeds were tested with different times of exposure to sulfuric acid immersion and heat. All the treatments induced germination two days after the start of the experiment and reached their maximum value between the days twenty-seven and twenty-nine, almost at the end of the experiment. Seeds treated with sulphuric acid, responded positively in all cases, the immersion in acid for fifteen minutes was the treatment that gave the best results. The treatment with heat at 80°C had lower germination than the control. However, in all the other cases, the seeds responded positively and at temperatures of 140 and 110°C for 2 min the best results were obtained.
  A. Khalil-Gardezi , A. Exebio-Garcia , E. Mejia-Saenz , E. Ojeda-Trejo , L. Tijerina-Chavez , Habibsha -Gardezi and M. Delgadillo-Pinon
  The aim of this study is to evaluate the growth response of Leucaena leucocephala inoculated with Glomus intrarradices and application of organic matter and the actual level of contamination with heavy metals Cu, Cr, Zn and Pb in soil irrigated with sewage and clean water. Sewage water is used for irrigation, which creates both opportunities and problems. This is an option to reduce the stress on limited fresh water and help meet the nutrient requirement of crops, but also produces contamination. In the irrigation District 018, Tulancingo, Hidalgo, Mexico, forage for cattle has been irrigated with residual water for several years. To evaluate the level of contamination of two plots, one hectare was irrigated with residual water and another with clean water. In soil the contamination of Cu, Cr and Ni are below the established limits for contaminants. Pb was not found. A comparison of soil irrigated with clean water or sewage water indicated that Cu is nearly twice as concentrated in soil irrigated by contaminated water; Ni is slightly greater; Cr is more abundant. Soil was collected for a greenhouse experiment with Leucaena leucocephala (guaje) to observe its growth with inoculation of Glomus intrarradices with different amounts of vermicompost. Later a factorial experiment 7x2 completely randomized design with five replications in the greenhouse was established. The variables measured were plant height, stem diameter, root volume, dry weight of biomass and dry weight of roots. The experiment lasted 180 days from planting until harvesting. It is concluded that the inoculation with Glomus intrarradices increased the absorption by Leucaena leucocephala in nutrient adsorption.
  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.
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