Análisis de la interacción genotipo por ambiente en papa (Solanum tuberosum spp. andigena), a través de una metodología no paramétrica

The Potato Breeding Program, which belongs to the National University ofColombia, carried out nine regional trials during 1998 and 1999 for the evaluation of20 promissory genotypes of Solanum tuberosum ssp. andigena. The non-pararnetric methodology proposed by Nassar el al. (1994) which it is based on a statistic that link yield and phenotypic stability was used. In order to analyzer the data set, a MACRO program in the SAS System was developed which allowed working with unbalance data for both repetitions and genotypes. It was also developed a multivariate analysis methodology, based on the yield-stability index, which permitted to analyze the yield when it is partitioning in classes. The results showed that the advantages for the use of non-pararnetric methodologies, are not relevant for the selection of genotypes next to be released to the farmer.