Improved maize seeds are one of the main factors that can contribute to improving maize productivity. This paper was carried out with the aim of identifying the determinants of adoption and improved maize seeds’ intensity use on households in all areas favourable to maize production in Benin using pooled data on 490 producers. Descriptive statistics such as mean, standard deviation, percentage, frequency distribution, t and chi-square tests were used to summarize the characteristics of the sampled producers. Cragg's Double Hurdle model was also used to categorize producers who adopted or who did not adopt improved maize seed and those who intensified the use of improved maize seed. The results showed that literacy, easy access to improved seed, specific training received on the use of improved varieties and gender, affected the adoption of improved maize seed while easy access to improved seed, maize yield, relationship with extension services, total household size, age squared, number of experience years in maize production, and distance from the producer to where the seed was purchased had a significant influence on the decision to intensify the use of improved maize seed. The fact that the variable easy access to improved seeds affected not only the adoption of improved seeds but also the intensification of their use, confirmed that access to improved seeds was an indisputable success factor for the intensification of improved seed use. Giving producers the capacity to obtain improved maize seed that was financially and geographically improved was a very important aspect to be considered by policy makers in the definition of agricultural policies. Predisposing factors for access(perception of varieties, attitudes towards the choice of new varieties, knowledge and management of these varieties)and capacity factors for access(income, availability of seeds in the environment, and seed prices)must be considered. The establishment of a wide seed distribution network through government and non-governmental organizations or private actors could, therefore, be important to reduce transaction costs and improve access to improved maize seed, and then increase the rate of adoption and continued use of improved seed.
RESUMEL'étude des groupements végétaux de la forêt classée d'Agrimey a pour but d'asseoir les bases d'un aménagement et d'une gestion durables des plantations forestières de ladite forêt. Cette étude intègre trois composantes intimement liées. L'étude phytosociologique de la végétation spontanée a eu lieu suivant l'approche synusiale intégrée. L'étude des facteurs écologiques (topographiques et pédologiques surtout) s'est faite à travers la mesure des pentes et des sondages à la tarière pédologique. L'étude des caractéristiques dendrométriques et sylvicoles des plantations forestières s'est faite par l'installation des placettes temporaires de 300 m 2 . Au total, quinze (15) synusies végétales ont été identifiées et intégrées en cinq (05) phytocénoses sur la base des relations spatio-temporelles : la phytocénose à Chromolaena odorata des milieux ensoleillés, la phytocénose à Imperata cylindrica indica et Chromolaena odorata des milieux dégradés, la phytocénose à Reissantia indica et Uvaria chamae des sols ferrugineux tropicaux bien drainés, la phytocénose à Mallotus oppositifolius et Deinbollia pinnata des sols ferrugineux tropicaux et vertisols assez bien drainés et la phytocénose à Mitragyna inermis et Nauclea latifolia des sols hydromorphes. Ces phytocénoses sont corrélées avec la productivité des plantations forestières. L'étude de la dispersion des niveaux de productivité autour de la valeur moyenne a montré que la productivité est remarquablement homogène au sein de chaque phytocénose. Par ailleurs, l'analyse de la variance a mis en évidence un effet très hautement significatif des phytocénoses sur la productivité des plantations. On en déduit en toute logique que le biotope de chaque phytocénose représente une station forestière.
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