Evaluation du rendement en coton-graine de nouveaux génotypes de cotonnier (Gossypium hirsutum L.) sélectionnés au Bénin Evaluation du rendement de nouveaux génotypes de coton

Abstract

Yield assessment of new released genotypes of cotton (Gossypium hirsutum L.) bred in Benin. This paper aimed at identifying the most productive upland cotton genotypes among seven new releases (P 625-1, P 746-1, Q 674-2, Q 723-4, Q 792-2, R 663-4 et R 689-1). The controls were the 3 varieties currently in use in Benin: ANG 956, OKP 768, and KET 782. Overall, 146 variety trials have been set over 3 years. All the new releases were evaluated on station, whereas only P 625-1 and P 746-1 have been tested on farmer field trials. Experiments were run according to a randomized complete block design. Data were analysed with a linear mixed model. The Genotype x Macro-environment interaction was retrieved from an Additive Main effects and Multiplicative Interactions (AMMI) model. Yields were poor in 2015, but got better thereafter. The Genotype x Year interaction was not significant (P>0.05). The Genotype x Macro-environment interaction was small, though significant (P<0.001). On station, R 663-4 and P 625-1 out-performed the check-varieties in Upper-North and South respectively. From the farmer-field trials, P 746-1 was the most productive in the Upper-North. In the South, P 625-1 ranked higher than KET 782. R 663-4, P 625-1, and P 746-1 are the most promising genotypes.