Adaptation de la pomme de terre au mode de production biologique en relation avec le compost et l' aspect varietal.

français. Dans cette etude relative a l' adaptation de la pomme de terre en agriculture biologique, deux essais ont ete realises. Le premier essai consiste a etudier l' adaptation varietale. Vingt varietes ont ete testees sur la base de parametres agronomiques tels que le rendement, la hauteur des plantes, le nombre et le diametre des tiges, la vigueur vegetative, la couverture vegetale et l' etat sanitaire. Les resultats montre que les varietes Arinda, Safrane, Obelix en particulier Atlas ont donne des rendements assez satisfaisants. Dans le second essai, quatre types de compost de composition differente et un fumier frais ont ete utilises pour la fertilisation et compares a un temoin sans fertilisation, afin d' etudier l' impact de ces traitements sur la variete Spunta de pomme de terre. Il n' y a pas eu de differences significatives entre les traitements du point de vue rendement.

anglais. In this study on potato adaptation to organic agriculture, two experiments were made. The first trial aims to study the varieties' adaptation. Twenty varieties were tested on the basis of agronomic parameters such as yield, plant height, the number and diameter of the stems, vegetative vigor, growth cover and the sanitary status. The varieties Arinda, Safrane, Obelix and particularly Atlas gave satisfactory yield. The yield was in general well correlated with agronomic criteria such as the quick emergence, the high number of stems, the good vegetative growth and the tolerance to the late and early blights. In the second trial, four compost types of different composition and a fresh manure were used for the fertilization, and compared to a non-fertilized control, in order to characterize the effects of these treatments on potato Spunta variety. Regarding yield, there is not a significant difference between the treatments.