Faculté des Sciences

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Browsing Faculté des Sciences by Author "Hannachi , Abdelhakim"

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    Ecological study for groups of citrus weeds in the Skikda region, Algeria
    (Journal of Research in Weed Science 2 (2019) 216-223, 2019-03-16) Hannachi , Abdelhakim
    The study of citrus weeds in the Skikda region during the 2017/2018 crop year included 40 phytoecological surveys of different crops. They were distributed throughout the study area in order to take into account the variability of ecological and Agronomic factors. The results obtained by the Correspondence Factor Analysis (CFA) highlight two groups of surveys including two groups of species. These results explain the distribution of citrus weeds in the Skikda region according to climate and edaphic conditions. The appearance of weed species was selective, for example, Oxalis Latifolia. Kunt. is a very common and abundant species in the more or less humid northern zone, whereas it is almost absent in the southern zone of the study area. On the other hand, Papaver rhoeas. was frequent and abundant in the southern zone, which is a somewhat dry zone, was almost absent in the northern zone.
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    INVENTORY OF THE FLORA OF ROSACEAE ORCHARDS IN THE SKIKDA REGION (ALGERIA)
    (Plant Archives Vol. 22, No. 2, 2022 pp. 62-66, 2022-09-14) Hannachi , Abdelhakim
    The study focused on the inventory and characterization of the Weeds flora of Rosaceae fruit trees in the Skikda region (Algeria). Forty-seven pharmacological surveys were carried out and made it possible to identify 102 weed species. The dicotyledons are dominant with 72 species. Monocotyledons include 30 species. The species listed are divided into 37 botanical families. The ratio of the number of monocotyledonous species to the number of dicotyledonous species (M/D) is 18.75. The biological type for all the species listed shows that annuals dominate and form 54.90% (56 species). Perennial weeds are well represented (31 species), as well as the presence of biennials (15 species). Species whose frequency is between 40 and 60% are three species. While five species have a frequency between 20 and 40%, the frequency <20% contains most of the species 95 or 93.13% of the total specific number