Confidence for recommending new corn hybrids in Panama.

The corn-breeding project of IDIAP evaluated 96corn cultivars in 132 localities, during 1989-2000. Thehighest yielding genotypes have been recommended to thegrowers. Nevertheless, to continue improving the evaluationsystem of new cultivars, it is necessary to determine theirconfidence degree in rela...

Descripción completa

Autores Principales: Camargo Buitrago, Ismael, Gordón Mendoza, Román, González, Andrés, Quirós, Eric, Figueroa, Alejandro
Formato: Artículo
Idioma: Español
Publicado: Universidad de Costa Rica 2014
Acceso en línea: http://revistas.ucr.ac.cr/index.php/agromeso/article/view/13225
http://hdl.handle.net/10669/17566
Sumario: The corn-breeding project of IDIAP evaluated 96corn cultivars in 132 localities, during 1989-2000. Thehighest yielding genotypes have been recommended to thegrowers. Nevertheless, to continue improving the evaluationsystem of new cultivars, it is necessary to determine theirconfidence degree in relation to the regional cultivars. Thepresent study aimed to estimate the stability of the most sownhybrids in the country by determining the performance,normalised over zero (RNi) of the superior cultivars. Theconfidence of performance was determined for the hybrids:3018, 3031, HS-8, P-8916, P-94922, P-9490 and X-1358K;compared to the hybrid X-304C. The evaluated hybrids wereclassified in three categories: Genotypes with high confidence(HS-8, P-9490 y X-1358K; 0.8= RNi<0.9), mediumconfidence (3018, 3031, P-9422; 0.6 = RNi<0.8) and lowconfidence (P-8916; 0.5=RNi<0.6). The values RNi for eachgenotype represent the probability that a genotype exceedsthe mean level of production of the reference hybrid (X-304C), RNi of 0.8 means that the performance of the newhybrids was superior in 8 of 10 localities. Additionally, it wasverified that the confidence is a measure closely related toparameters of stability based on a regression model. Thisstudy stated that hybrids with superior capabilities ofproduction and adaptation to diverse ecological zones throughthe years were HS-8, P-9490 and X-1358K.