Tomato seed coating with growing concentrations of synthetic polymer/Recobrimento de sementes de tomate com concentracoes crescentes de polimero sintetico

The airing of fungicides, insecticides and growth regulators through the film coating tomato seed can be promising in the context of the production of seedlings. However, first there is a need to understand the dynamics of polymers in the germination and vigor of seeds. In this way, it was determined the effects of film coating on the physiological potential of tomato seeds and seedling growth. To this end, it was used a completely randomized design in factorial scheme 2x4, being two cultivars ('Santa Clara ' and 'Kada Gigante') with four concentrations of polymer Disc AG Red L-203[R] (0, 50, 100 and 150mL [kg.sup.-1] of seed), and four replications. The interaction among the factors (cultivar x polymer concentrations) ocurred only for variables germination and first count. Concentrations 100 and 150mL [kg.sup.-1] harmed the germination of seeds of tomato cultivate 'Santa Clara'. The 'Kada Gigante' cultivar obtained a better performance when compared to 'Santa Clara' regarding the emergence of seedlings. The effect of film coating on the seeds germination of tomato depends on the cultivar The physiological potential of tomato seeds is not changed by the use of coating polymers. Key words: Solanum lycopersicum L, film coating, seed physiological quality. A veiculacao de fungicidas, inseticidas e reguladores de crescimento por meio da peliculizacao as sementes de tomate pode ser promissora no contexto da producao de mudas. No entanto, primeiramente, e necessario entender a dinamica do revestimento com polimeros na germinacao e vigor de sementes. Dessa forma, determinaram-se os efeitos da peliculizacao no potencial fisiologico de sementes de tomate e no crescimento de mudas. Para tanto, empregou-se o delineamento inteiramente casualizado, em esquema fatorial 2x4, sendo duas cultivares ('Santa Clara' e 'Kada Gigante') e quatro concentracoes do polimero Disco AG Red L-203[R] (0, 50, 100 e 150mL [kg.sup.-1] de semente), com quatro repeticoes. A interacao entre os fatores (cultivar x concentracoes de polimero) ocorreu somente para as variaveis germinacao e primeira contagem. As concentracoes 100 e 150mL [kg.sup.-1] prejudicaram a germinacao de sementes de tomate da cultivar 'Santa Clara'. A cultivar 'Kada Gigante' obteve um desempenho superior a 'Santa Clara ' quanto a emergencia de plantulas. O efeito da peliculizacao na germinacao de sementes de tomate depende da cultivar utilizada. O potencial fisiologico de sementes de tomate nao e alterado pelo uso de polime