Comparison of methods for the evaluation of adaptability and stability for yield in cotton genotypesAbstract -The objective of this work was to compare different methods used to estimate adaptability and stability of 17 cotton genotypes evaluated in 23 locations of the Brazilian savannah. Genotype and environment effects and genotype x environment interaction were significant. According to ecovalence and AMMI models, cultivar BRS Cedro showed the best stability. Varieties Delta Penta and BRS Ipê were among the most unstable genotypes, but not among the most productive. Using the methods of Eberhart & Russel, Lin & Binns and Annicchiarico, genotypes BRS 269 -Buriti, FMT 701 and CNPA GO 2001-999 were the most stable and among the five most productive on average. The evaluation of the specific adaptabilities provided by the AMMI analysis is of great importance in the study of the behavior of genotypes. The amount of information generated and the facilities of interpretation favors Lin & Binns method, which can be complemented by an AMMI analysis.Index terms: Gossypium hirsutum, AMMI analysis, assesment of cultivars, ecovalence, genotype x environment interaction. IntroduçãoNo Brasil, o algodoeiro (Gossypium hirsuntum L.) é cultivado em toda a faixa tropical, e a região do Cerrado se destaca tanto em área cultivada quanto em produtividade. Contudo, dada a extensão dessa região, condições diferentes de clima e solo são encontradas e, portanto, é esperada ausência de comportamento consistente de genótipos nos diversos ambientes.A identificação de cultivares com maior estabilidade fenotípica é uma das estratégias para amenizar o efeito da interação genótipos x ambientes (GxA).A metodologia denominada de ecovalência, proposta por Wricke, citado por Cruz & Regazzi (1997), decompõe a soma de quadrado da interação em partes atribuídas a cada genótipo, e considera como mais estável o genótipo que apresente menor estimativa para a ecovalência. Ramalho et al.(1993) comentam que a ecovalência é

This paper proposes the use of Near Infrared Hyperspectral Imaging (NIR-HSI) as a new strategy for fast and non-destructive classification of cotton seeds with respect to variety.

Cotton cultivar BRS 336 is a high-quality fiber upland cultivar and has wide adaptation to the Brazilian growing areas, with resistance to bacterial blight. BRS 336 exhibited fiber length higher than 32.0 mm in all field tests. Also, fiber strength exceeded all upland cotton currently grown in Brazil.

-BRS 369RF and BRS