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Articles by A. Mebarkia
Total Records ( 4 ) for A. Mebarkia
  A. Mebarkia , A. Guechi , S. Mekhalif and M. Makhlouf
  The aim of this study is the effect of the trophic medium on the biotic potential of the two species, Sitophilus granarius L. and Rhyzopertha dominica F. and the relationship between biological observations and the quantitative loss induced by the development of insects. The quality and sensibility of cereals influential the behaviour of the 2 pests. The average descent was influenced by the cereal type. Therefore, in specific mono-population, the average emergence per day, for the corn, varies from 0.61 for S. granarius L. to 0.12 for R. dominica F.; on the other hand for the soft wheat, it varies from 4.35 to 5.81, respectively. Whereas, in hetero-specific population, sensibility of the various cereals types to the attacks by R. dominica F. increases in the presence of S. granarius L., for an initial rate of infestation of 2 couples. The reverse was observed if the rate of infestation was doubled. The longest duration of development was observed for the corn with 40 and 55 days for S. granarius L. and R. dominica F., respectively. Shortest was recorded for the rice with 28 and 42 days for both. The highest loss of dry matter, in soft wheat with 4.74 and 6.09% for R. dominica F. and S. granarius L., respectively, while in corn was less than 1%.
  A. Mebarkia , K. Abbas and A. Abdelguerfi
  The experiment was conducted during two cropping seasons (2001/2002 and 2002/2003), with the objective to study the Phenology and agronomic performances of the fifteen ecotypes of the species (Vicia narbonensis L.) under the agro-climatic conditions of the semi-arid region of Setif. The various phenological stages of the plant, the fodder and grains yields and several characters relating to the quality of seeds were measured. The results obtained show large diversity among phenological ecotypes of Vicia narbonensis L. The ecotype 2466 is very early for the beginning of flowering, for full flowering, for the beginning of pods formation and for complete maturity. In contrast, ecotype 2390 is the latest for all the phonological stages measured. Concerning forage and grain production, the statistical analysis showed highly significant differences between ecotypes. The best fodder and grain productions are reported for the late flowering ecotypes. Ecotype 2390 produced average values of 2.5 ton dry matter ha-1 of fodder and 16.9 quintals ha-1 of grains. The fodder and grain yields were correlated positively (p<0.05) with the number of days to the full flowering, which guides the selection towards the late ecotypes. Highly significant differences were observed for total nitrogen and fat contents of seeds (p<0.01). Ecotypes 2393 and 2467 produced the highest concentrations in fat (1.2%) and the ecotype 2462 produced 33.6% in total nitrogen.
  A. Mebarkia , K. Abbas and A. Slimani
  We studied the dry matter yield, grain yield and yield components of ecotype 2388 of Vicia narbonensis L. using three seeding rates and three levels of phosphorus. The experiment was conducted during two crop years 2009/2010 and 2010/2011 in the Agricultural Technology Institute located in the semi arid region of Setif in Algeria. The experimental design adopted was a complete randomized block with three repetitions. Phosphorus levels used are 60, 80 and 120 kg ha-1 and seeding rates are 40, 60 and 80 seeds m2. Analysis of variance indicates that the dry matter yield, grain yield and agronomic traits were significantly affected by the density and phosphorus levels. Using the rate of 120 kg ha-1 of phosphorus results in average yields very important of dry matter of about 45.61 qx ha-1, grain yield of 15.60 qx ha-1 , plants highest of 60.84 cm and a length of pods best of 5.19 cm. Density of 80 m2 grains has spawned better grain yields of 15.48 and 47.62 qx ha-1 of dry matter. However, the number of seeds per pod and weight of 100 seeds were affected differently. The low density of 40 seeds m2 recorded the most important weight of 100 seeds of 16.46 g and a number of seeds per pod high of about 4.94. Significant positive correlations were observed between grain yield and plant height (r = 0.825) and dry matter yield (r = 0.715) and negatively correlated with the number of grains per pod (r = -0.654, p<0.05).
  A. Mebarkia , Y. Abdi , S. Rahmani and A. Abjabi
  The aim of this study was to evaluate the toxicity of pea albumin 1 subunit b (PA1b) homologous against granary weevil (Sitophilus granarius L.). Adults of less than 5 days were maintained at 27±0.2°C and 70±5% relative humidity, on bread wheat (Triticum aestivum L. subsp. Aestivum) flour dumplings (control) and on pea flour, chickpea, bean, lentil, broad bean (toxic) during 15 days. The concentrations of used pea flour were 10, 20, 40, 60 and 80%. On PA1b reference: Pea/wheat with 80% pea flour, we have observed on the 3rd day, a mortality rate over 10%. From 7 days there were no survivors. For concentrations of 40 and 60%, the mortality rate was 73 and 93%, respectively; but at 10 and 20% of pea, the rate was low not exceeding the 20% threshold. A significantly positive correlation (R2 = 0.91) was observed between the concentration of pea flour extract and the mortality rate of Sitophilus granarius L. The linear regression of semi-logarithmic curve is highly significant (p = 0.012, <0.05) and allow to determine the LD50 of which is 25.63±3.26% or 64.075±8.14 mg. At the maximum concentration of 80% on lentil, bean and broad bean, there was a total mortality of the insect at 7 days; others are less toxic such as pea with 30% and chickpea, whose mortality rate does not exceed the 23% threshold. Furthermore, complete mortality of the insect was observed after 14 days in all grain legumes.
 
 
 
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