Effets de l’age de transplantation et de l’annee culturale sur les performances agronomiques du chou pomme (brassica oleracea) a faranah republique de Guinee

This study was carried out over two cropping seasons (2023 and 2024), in the Urban Municipality ofFaranah located in south-western Guinea, more precisely in the Sagbaya market garden perimeter covering an area of 8.5 hectares. The aim of this research was to evaluate the influence of transplanting age and crop year on the agronomic performance of cabbage (Brassica oleracea var. capitata). A Randomized Complete Block Design (R.C.B.D.) trial was carried out, with three variants represented by three transplanting ages repeated three times. Three transplant ages of 26 days (A1), 36 days (A2) and 46 days (A3) were tested. Variables measured included average plant height at harvest and apple circumference in cm, average apple weight in kg, and above-ground, biological and agricultural biomass yields in t/ha. The results of the two-factor analysis of variance (ANOVA) revealed that transplant age had a significant effect on all the variables studied (p < 0.05), with optimum agronomic performance obtained for seedlings aged 36 days (A2). The crop year also influenced certain variables such as average weight leaves apples and yields, reflecting inter-annual variability probably linked to environmental conditions. A significant interaction between plant age and year was observed for apple circumference, indicating that the effect of age on this variable depended on the specific conditions of the crop year. In conclusion, plants transplanted in 2023 at 36 days old showed better agronomic performance in cabbage cultivation for all ages and crop years tested. Thus, taking into account the age of cabbage transplants and annual climatic conditions, among other agrotechnical measures, would enhance the sustainability of market gardening systems in Guinea.