This study was conducted to determine the risk factors associated with the contamination of lettuce grown in the suburban area of Abidjan. A total of 216 samples were collected. Total aerobic bacterial counts and Enterobacteriaceae were investigated on soil, fertilizer, irrigation water and lettuce samples. Mean values of total aerobic count for sites 1 and 2 were 9.97 log 10 cfu/g and 8.20 log 10 cfu/g for the manure respectively, and 8.11 log 10 cfu/g for the soil of both sites. Lettuce samples from the market were more contaminated by Enterobacteriaceae than those obtained from the production sites. The main enterobacteria isolated were Salmonella gallinarum, Serratia marcescens and E. coli. All the lettuce samples analysed were contaminated by E. coli and Serratia. The prevalences of Serratia marcescens on lettuce from the market and from the production sites 1 and 2 were 58.33%, 33.33% and 41.67% respectively while those of E. coli were 33.33%, 25% and 8.33% respectively. The most common Salmonella serotypes isolated was Salmonella gallinarum with prevalences of 50%, 41.67%, 58.33%. Salmonella choleraesuis and Shigella sonnei were weakly represented. The manure has the highest potential as a source of contamination and infection of lettuce followed by the soils.
Une étude a été réalisée à la station de recherche sur les cultures vivrières du CNRA de Bouaké en vue de déterminer les performances agronomiques de quinze (15) nouvelles lignées de tomate. Ces lignées ont été évaluées, selon un dispositif en blocs de Fisher avec trois répétitions. Les observations et mesures ont porté en autres sur le développement végétatif, les stades phénologiques et le rendement. Les résultats obtenus ont révélé une variabilité entre les lignées pour l'état végétatif et la hauteur des plants. La taille des plants a varié entre 41 et 62 cm. La plus grande taille a été produite par la lignée TM41/14EW. L'étude de la phénologie a montré que le délai de floraison a varié entre 52 et 63 jours après le semis (JAS) et celui de la première récolte a été compris entre 96 et 101 JAS. Pour ces paramètres, TM39/14EW, TM47/14EW et TM48/15BF ont été tardives. L'évaluation des rendements a permis de noter que les lignées TM44/14EW, TM40/14EW, TM43/4EW et TM42/14EW ont été les plus productives avec un rendement moyen de plus de 30 t/ha. Les lignées TM40/14EW et TM43/14EW ont produit des nombres élevés de fruits par plant et qui ont été les plus fermes. A l'issue de cette étude, il est à noter que les objectifs ont été atteints car des lignées à hauts rendements et à fruits fermes s'adaptant bien aux conditions climatiques de la Côte d'Ivoire ont été identifiées. En conséquence, la confirmation en milieu paysan de lignées telles que TM40/14EW, TM43/14EW et TM44/14EW devrait être envisagée.
Three African eggplant (Solanum spp.) varieties were assessed in six mineral manures doses T + 1/2T, T + 1/4T, T, T -1/4T, T -1/2T and without fertilizer, with reference treatment T = 300 kg/ha of NPK 10-18-18 applied before transplanting + a mixture of 100 kg/ha of urea and 200 kg/ha of potassium sulphate at 30, 60 and 90 d after transplanting, to establish fertilization protocol for their cultivation. The experiment was laid out in split-plot design with three replications with varieties constituting the main factor and the fertilizer doses as secondary factor. The main observed parameters were the number of days to 50% flowering, the fruit number and weight per plant, individual fruit weight and fruit yields. As results, the interaction between varieties and fertilizer doses was significantly different only for the number of days to 50% of flowering (P = 0.0078) and the fruit number per plant (P = 0.0001), while any significant difference was observed for individual fruit weight (P = 0.64), fruit weight per plant (P = 0.74) and fruit yields (P = 0.74). The difference among the fertilizers treatments was significant for the number of days to flowering, number of fruits per plant, fruit weight per plant and fruit yield for Aub33K/06Gn and Aub55N/10K, whereas any significant difference was observed for these parameters concerning Aub21N/06Du. Whatever the variety, there was not any significant difference among the fertilizers treatments for the individual fruit weight. For Aub33K/06Gn and Aub55N/10K cultivation, the fertilizers doses T -1/4T and T -1/2T are suggested, respectively, while a specific study is proposed for Aub21N/06Du. As perspective, economic studies are proposed to confirm the above suggested choices of fertilizers rates.
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