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Plantas que apresentam rápido estabelecimento possuem prioridade na utilização dos recursos do meio; por isso, levam vantagem na competição com plantas vizinhas. O objetivo deste trabalho foi detectar variações na velocidade de estabelecimento de cultivares de arroz irrigado. Para isso, conduziram-se três experimentos: dois deles em casa-de-vegetação e outro em campo. Em ambas as condições, investigou-se o comportamento de nove cultivares de arroz. Para caracterizar a rapidez de estabelecimento, avaliaram-se: velocidade de emergência das plântulas, estatura de planta, área folhar e massa da parte aérea aos 15 dias após a semeadura. Os genótipos Ligeirinho e XL 6 mostraram características que lhes conferem rápido estabelecimento, enquanto, Bluebelle e Formosa apresentaram características indicativas de lento estabelecimento. Plants that present fast establishment possess priority in utilizing environmental resources; therefore, they present advantage in competitive ability with their neighbours. The objective of this research was to detect variations in speed of establishment in flooded rice cultivars. This way, there were conducted three experiments, two of them in the greenhouse and the other in the field. In both conditions, it was investigated the behavior of nine cultivars. In order to characterize speed of establishment, there were evaluated: emergency velocity, plant height, leaf area, and aerial weight of the seedlings 15 days after sowing. The genotypes Ligeirinho and XL 6 showed characteristics that attribute them fast establishment; whereas, Bluebelle and Formosa presented characteristics indicative of slow seedling establishment

Velocidade de estabelecimento em cultivares de arroz irrigado como característica para aumentar a habilidade competitiva com plantas concorrentes