4 research outputs found
Analyse de la flore aquatique envahissante dans les plans dâeau de la ville de Daloa (Centre Ouest de la CĂŽte dâIvoire)
Objectif : La prĂ©sente Ă©tude, rĂ©alisĂ©e dans les plans dâeau de la ville de Daloa (Centre Ouest de la CĂŽte dâIvoire), avait pour objectif principal dâavoir une meilleure connaissance de la flore aquatique envahissante dans la perspective de sa gestion efficiente.MĂ©thodologie et rĂ©sultats : La collecte des donnĂ©es a combinĂ© la mĂ©thode des relevĂ©s de surface et celle dite itinĂ©rante. AprĂšs lâinventaire, lâidentification proprement dite des espĂšces rĂ©coltĂ©es sâest faite Ă partir de la base de donnĂ©es globale des espĂšces envahissantes (www.issg.org/database/welcome/), de la documentation sur la flore ivoirienne et avec lâappui dâun systĂ©maticien du Centre National de Floristique de lâUniversitĂ© FĂ©lix HouphouĂ«t Boigny. Lâinventaire a Ă©tĂ© faite sur quatre sites suivant un Ă©chantillonnage direct. La flore des VAE recensĂ©s est constituĂ©e de dix espĂšces, reparties en dix familles, dix genres et deux embranchements. Il ressort que Nymphaea lotus, Cyperus articulatus, Typha domingensis et Eicchornia crassipes sont les plus dominants. Parmi toutes ces espĂšces, celles appartenant Ă lâembranchement des Angiospermes sont les plus reprĂ©sentĂ©es. Conclusion et application des rĂ©sultats : Nymphaea lotus, Cyperus articulatus, Typha domingensis et Eicchornia crassipes sont les espĂšces les plus dominantes dans les plans dâeau de la ville de Daloa. La prolifĂ©ration de ces espĂšces est favorisĂ©e par les pollutions de types agricoles et mĂ©nagers qui sont pratiquĂ©es autour des plans dâeau. Cela induit la rĂ©gression de la surface des plans dâeau, la diminution des activitĂ©s de pĂȘche et la prolifĂ©ration des moustiques responsables du paludisme.Mots clĂ©s : Inventaire, VAE, Daloa, CĂŽte dâIvoire
Dynamics of Human Pressures on the Mont PĂ©ko National Park (West-CĂŽte d'Ivoire)
The Mont PĂ©ko national Park (MPNP) located to the West of CĂŽte d'Ivoire underwent severe human pressure related to a succession of political and military crises from 2002 to 2011. Since 2013, the Ivoirians government is engaged in a process of rehabilitation of this park. This study aimed to evaluate the dynamics of human pressures from 1996 to 2018, in order to allow the manager of the park to better focus their awareness and protection activities. To achieve this, the RAPPAM method of WWF international was adopted for the collection of data. The study identified 10 types of pressures of which farm is the most severe followed by pressure on land, logging, bush fires, the establishment of settlements, poaching and pollution. The intensity of pressures on the MPNP doesnât significantly vary depending on the areas, but this varies according to the socio-political gradient in time. The pressures have evolved gradually from 2002 to 2011 before beginning to decline progressively until 2018. Currently, except for uncontrolled bush fires, all pressures declined significantly, or even disappear for some. The existence of a variety of pressures on the MPNP to disturbing proportions is therefore related in part to the lack of monitoring during the crises. The anthropization of the MPNP found the springs of its acceleration in the existence of an armed gang who have organized, systematic exploitation of the resources
Effets de biofertilisants Ă base de Tithonia diversifolia et de Thevetia neriifolia sur la production de la laitue en CĂŽte dâIvoire
The search for a reliable and effective alternative to chemical fertilizers is important for sustainable agriculture. This study was carried out to evaluate the biofertilizing effect of Tithonia diversifolia and Thevetia neriifolia on the production of lettuce (Lactuca sativa). Three leaf treatments of Tithonia diversifolia (liquid and fresh) and Thevetia neriifolia (liquid) were applied to lettuce plants in a completely randomized block of four treatments and four replicates, in addition to a Control treatment without any fertilizer input. Inputs based on liquid T. diversifolia and fresh T. diversifolia recorded high yields of 19.6 and 18.8 t/ha respectively of fresh lettuce biomass compared to Thevetia leaves (18.5 t/ha) and to the control (13.9 t/ha). Tithonia diversifolia could be used for the development of an effective biofertilizer in vegetable production.
Keywords: Biofertilizer, Tithonia diversifolia, Thevetia neriifolia, Lettuce, Sustainable agricultureLa recherche dâalternative fiable et efficace aux fertilisants minĂ©raux est une nĂ©cessitĂ© pour une agriculture durable. La prĂ©sente Ă©tude a Ă©tĂ© rĂ©alisĂ©e pour Ă©valuer le potentiel fertilisant des feuilles de Tithonia diversifolia et de Thevetia neriifolia sur la culture de la laitue (Lactuca sativa). Trois traitements, constituĂ©s de feuilles fraiches hachĂ©es de Tithonia diversifolia (frais), de purin de feuilles de Tithonia diversifolia (liquide) et de purin de feuilles de Thevetia neriifolia (liquide), ont Ă©tĂ© appliquĂ©s aux plants de laitue et comparĂ©s Ă un tĂ©moin. Les rendements de laitue obtenus avec les apports de biofertilisants Ă base de T. diversifolia liquide et T. diversifolia frais ont Ă©tĂ© Ă©levĂ©s respectivement de 19,6 et 18,8 t/ha de biomasse fraiche de laitue comparativement aux feuilles de Thevetia (18,5 t/ha) et au tĂ©moin (13,9 t/ha). Tithonia diversifolia pourrait ĂȘtre utilisĂ©e pour la mise en place dâun biofertilisant efficace en culture maraichĂšre.
Mots clés: Biofertilisant, Tithonia diversifolia, Thevetia neriifolia, Laitue, Agriculture durabl
BIOLOGY AND HARMFULNESS OF INVASIVE DISCOSCOREA IN SUGARCANE (SACHARUM OFFICINARUM L.) CULVITATION IN THE AREA OF THE SUGAR REFINERY COMPLEX OF FERKESEDOUGOU IN NORTH COTE DâIVOIRE
*Author for Correspondence Floristic sampling done in hundred plots around the sugar refinery complex of Ferke 1 and Ferke 2 located in Ferkessedougou in North Cote dâIvoire during the cropping cycle of 2011-2012, revealed 30 species of weed including 6 of invasive Discoreas as D. bulbifera, D. dumetorum, D. hirtiflora, D. lecardi,. paraehensillis and D. preussii. Observations done on the biology, the phenology and the harmfulness showed that the occurrence of invasive Dioscorea in sugarcane fields was effective by bulbils and in certain level by tubers and bulbils generating new tubers, when produced during the vegetative growth stage between the second and seventh months of cultivation. D. bulbifera, D. dumetorum, D. hirtiflora and D. lecardi were producer of bulbils and occurred in highest potential densities. Excepted for D. lecardi, they were more harmful to sugarcane plant because of overlapping of vegetative cycle durations likewise for D. praehensilis. Hence, these weeds may have high competiveness ability with the crop for soil water and nutrient uptake as well as for sun light reception. Key Words: Weed, Dioscorea, Sugarcane, Biology, Phenology and Harmfulnes