Qualidade fisiológica de sementes de milho em função de tipo de híbrido e forma da semente

Abstract

With the increasing level of technology in the market for hybrid maize seed, seeking to achieve new levels of productivity, the demand of high physiological quality seed is a factor required for famers. The importance of seeds with high vigor and high germination are crucial for companies in this sector to achieve success with their products. In this study we have analyzed the data for germination and vigor from Agroeste Sementes in Campo Verde MT. The seeds were, separated by lots according screen type (flat or round) and size (16, 18, 20, 22 and 24), by type of hybrid (HS, HSM, HT and HD) and in three different crop years (2005, 2006, 2007). The results showed little difference between the years of assessments for the mean values of germination and vigor and their standard deviation values. The following conclusions were taken: 1 – Seed physiological quality varies according to the hybrid type; 2 – The seed physiological quality tends to be lower on simple hybrids and 3 – Physiological quality of smaller maize seeds have higher variability.