ESTIMACION DE LA ADAPTABILIDAD Y ESTABILIDAD DE VARIEDADES DE Pennisetum purpureum EN DIFERENTES CONDICIONES AMBIENTALES

Abstract

Eight Pennisetum purpureum strains were studied using a randomized block design with three repetitions at three different localities: San Cristóbal enterprise, Genética de Matanzas Enterprise and "Indio Hatuey" research station. Results were submitted to factorial analysis and lineal, regression techniques in order to know the adaptability and stability of these strains. Signification in genotype, environment and environment interaction was found in all indicators (yield, height and leaf content). No signification for interactions was recorded when the season was related with genotype (exception in G x L x S; P<0,05) although the season was the factor of highest contribution (P<0,001) to variance; this was due to the few genotypic variability and the use of irrigation in one of the localities. The utilization of Taiwan A-144, Taiwan A-148, 801-4, Merkerón and king grass cultivars is recommended taking into account their suitable adaptability (bi = 1), marked stability (∫2 ij n - 2 = 0 ) and mean of yield, height and leave content which was superior or slightly inferior than varietal mean of all studied environment.