3 research outputs found

    CaractĂ©risation Аgronomiques des Аrbres Еlites Аnacardier (Anacardium occidentale L.) SĂ©lectionnĂ©s des Zones de Production au Togo

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    Les maillons des interprofessions anacarde ont un intĂ©rĂȘt Ă©conomique commun pour  des entreprises nationales et internationales. La faible productivitĂ© des plantations au Togo est causĂ©e par l’utilisation des semences tous venants et de l’absence de sĂ©lection du matĂ©riel vĂ©gĂ©tal  performant. L’objectif de l’étude est d’augmenter les rendements avec les noix de qualitĂ©. Trois prospections annuelles prĂ©cĂ©dĂ©es  d’un prĂ© identification des vergers des arbres Ă  productivitĂ© Ă©levĂ©e ont Ă©tĂ© rĂ©alisĂ©es. Les critĂšres de choix des arbres ont Ă©tĂ© l’ñge, forme de l’arbre et de la noix, qualitĂ© de l’amande, productivitĂ©, nombre d’inflorescences, pĂ©riode de fructification, Ă©tat sanitaire des arbres prĂ© identifiĂ©s. 36 arbres prĂ©sentant les meilleurs critĂšres ont Ă©tĂ© retenus. La structuration agronomique a permis d’obtenir trois groupes d’arbres ayant une productivitĂ© moyenne entre 24,67±1,764 et 72,33±5,983 kg, un grainage compris entre 139 et 221, un KOR  compris entre 41 et 60, les taux d’amande entre 260 et 314. Les arbres Ă©lites obtenues vont permettre de produire des  plants amĂ©liorĂ©s Ă  partir du greffage et le sur greffage. La rĂ©sistance de ces arbres Ă©lites aux maladies va contribuer Ă  contrĂŽler l’état sanitaire des vergers par une lutte intĂ©grĂ©e. Les rendements production anacarde vont augmenter avec l’utilisation des semences sĂ©lectionnĂ©es.   The links of the cashew inter-branch associations have found a common economic interest for national and international companies. The low productivity of plantations in Togo is caused by the use of all-coming seeds and the lack of selection of efficient plant material. The goal of the study is to increase yields with quality nuts. Three annual surveys preceded by a pre-identification of orchards of high productivity trees were carried out. The criteria for choosing trees took into account the age, shape of the tree and nut, the quality of the kernel, productivity, inflorescences, fruiting period, and health status of the pre-identified trees. 36 trees with the best criteria were selected. The agronomic structuring made it possible to obtain three groups of trees with an average productivity between 24.67±1.764 and 72.33±5.983 kg, graining between 139 and 221, KOR between 41 and 60, the fine rates between 260 and 314. The elite trees thus obtained will make to produce improved plants from the grafts and over-grafting. The resistance of these elite trees to diseases will help control the health status of orchards through integrated pest management. The resistance of these elite trees to diseases will help control the health status of orchards through integrated pest management. Cashew production yields will increase with the use of selected seeds from the study

    CaractĂ©risation Аgronomiques des Аrbres Еlites Аnacardier (Anacardium occidentale L.) SĂ©lectionnĂ©s des Zones de Production au Togo

    Get PDF
    Les maillons des interprofessions anacarde ont un intĂ©rĂȘt Ă©conomique commun pour  des entreprises nationales et internationales. La faible productivitĂ© des plantations au Togo est causĂ©e par l’utilisation des semences tous venants et de l’absence de sĂ©lection du matĂ©riel vĂ©gĂ©tal  performant. L’objectif de l’étude est d’augmenter les rendements avec les noix de qualitĂ©. Trois prospections annuelles prĂ©cĂ©dĂ©es  d’un prĂ© identification des vergers des arbres Ă  productivitĂ© Ă©levĂ©e ont Ă©tĂ© rĂ©alisĂ©es. Les critĂšres de choix des arbres ont Ă©tĂ© l’ñge, forme de l’arbre et de la noix, qualitĂ© de l’amande, productivitĂ©, nombre d’inflorescences, pĂ©riode de fructification, Ă©tat sanitaire des arbres prĂ© identifiĂ©s. 36 arbres prĂ©sentant les meilleurs critĂšres ont Ă©tĂ© retenus. La structuration agronomique a permis d’obtenir trois groupes d’arbres ayant une productivitĂ© moyenne entre 24,67±1,764 et 72,33±5,983 kg, un grainage compris entre 139 et 221, un KOR  compris entre 41 et 60, les taux d’amande entre 260 et 314. Les arbres Ă©lites obtenues vont permettre de produire des  plants amĂ©liorĂ©s Ă  partir du greffage et le sur greffage. La rĂ©sistance de ces arbres Ă©lites aux maladies va contribuer Ă  contrĂŽler l’état sanitaire des vergers par une lutte intĂ©grĂ©e. Les rendements production anacarde vont augmenter avec l’utilisation des semences sĂ©lectionnĂ©es.   The links of the cashew inter-branch associations have found a common economic interest for national and international companies. The low productivity of plantations in Togo is caused by the use of all-coming seeds and the lack of selection of efficient plant material. The goal of the study is to increase yields with quality nuts. Three annual surveys preceded by a pre-identification of orchards of high productivity trees were carried out. The criteria for choosing trees took into account the age, shape of the tree and nut, the quality of the kernel, productivity, inflorescences, fruiting period, and health status of the pre-identified trees. 36 trees with the best criteria were selected. The agronomic structuring made it possible to obtain three groups of trees with an average productivity between 24.67±1.764 and 72.33±5.983 kg, graining between 139 and 221, KOR between 41 and 60, the fine rates between 260 and 314. The elite trees thus obtained will make to produce improved plants from the grafts and over-grafting. The resistance of these elite trees to diseases will help control the health status of orchards through integrated pest management. The resistance of these elite trees to diseases will help control the health status of orchards through integrated pest management. Cashew production yields will increase with the use of selected seeds from the study

    Effect of human disturbance and climatic variability on the population structure of Afzelia africana Sm. ex pers. (Fabaceae–Caesalpinioideae) at country broad-scale (BĂ©nin, West Africa)

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    AbstractAnthropogenic disturbances and climatic variations are presumed to alter species population structures. In this study, we assessed the population structure of the endangered species, Afzelia africana across gradients of climate and human disturbances. Dendrometric variables such as regeneration and tree density, mean diameter, basal area and height and stem diameter distribution were recorded at national scale in forest reserves located in three different climatic zones in BĂ©nin. A canonical discriminant analysis was applied to describe the species' population structure across climatic zones and disturbance levels. Relationships between the principal components (structural parameters of A. africana stands) and climatic variables and disturbance levels were assessed using Pearson correlation. Significant differences were found in the structural parameters between the disturbance levels, mostly in the Guinean zone. Structural parameters also differed significantly across the three climatic zones, with the Guinean zone recording the highest values. The effects of disturbance levels on structural parameters depend on the climatic zone, and vice versa. The results imply an interaction between climatic zones and disturbance levels. In the Guinean zone, the tallest and biggest trees were found at the low disturbance level. However, along the climatic gradient (towards drier regions), trees were shorter and smaller irrespective of disturbance level. Further, the tallest and biggest trees were found at lower altitudes
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