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Articles by Jesus Herrera Corral
Total Records ( 2 ) for Jesus Herrera Corral
  Gabriela Barragan Valencia , Vicente Hernandez Vargas , Jose Natividad Uribe Soto , Nestor Naranjo Jimenez and Jesus Herrera Corral
  Problem statement: Presence of Trichoderma spp. in agricultural soils decrease incidence of diseases by phytopathogen fungi. Sanity diagnostic require to know if exist beneficial microorganism and what agricultural practices help to their propagation. Approach: Samples (30) were taken from soils and sick plants of ten sites in four localities of Valley of Poanas. Phytophthora capsici Leo, Rhizoctonia solani Kühn and Trichoderma sp were isolated in agar V8 and were identified by microscopy. Results: In the 30 samples analyzed the presence of Phytophthora capsici Leo and Rhizoctonia solani Kühn was determined. Two isolations of Trichoderma sp were obtained from soil, they had antagonist activity against to P. capsici and R. solani on agar-V8 medium and showed chitinase activity. Sugar production in chitinase (10 mg.mL-1) by crude extract of Trichoderma growth in basal medium more chitin was determined. The average of sugar production from strains were 0.1175 and 0.1125 mg.mL-1 and standard deviations were 0.0567 and 0.0567 in four repetition. Interviews were applied to fifty farmers about cultivars and cultivation practices. At least seven types of chili were cultivated in the region of the Valley of Poanas, inorganic fertilization, irrigation systems by channel, gates and pumps were used. One hundred percent of farmers reported diseases of Damping off and Phytophthora root. Biocides were not used to control these diseases. Conclusion: The natural presence of Trichoderma spp was detected in Valley of Poanas, but some practices as inorganic fertilization and irrigation system can be contributing to propagation of phytopathogen fungi.
  Jesus Herrera Corral , Martin E. Pereda Solis , Yolanda Herrera Arrieta , Francisco Gonzalez Gonzalez , Manuel Murillo Ortiz , Francisco O. Carrete Carreon , Armando Cortez Ortiz and Norma Almaraz Abarca
  The aim of this study was to estimate stocking rate in open grassland considering its primary productivity, diet quality and voluntary intake of beef cattle. To achieve this, the methodology and systems analysis approach was used. By means of the Stella 8.0 simulation program a model was developed whose predictions show an 11% of difference in the actual primary productivity respect to that estimated of 3 years with different precipitation. In the study period, the stocking rate estimated in 2000 ha in the study period according to dry matter intake, crude protein and metabolizable energy ranged between 248-663, 233-823 and 297-758 animal units, respectively. The monthly stocking rate average estimated by the model base on produced dry matter and protein crude and metabolizable energy was 247.4, 289.5 and 321.54 animal units, respectively. Stocking rate and stocking coefficient predicted by the model indicate that assigning the hectares per animal unit will meet the needs of dry matter intake but there is a deficiency of crude protein and metabolizable energy when the mean annual precipitation is equal or lower to average.
 
 
 
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