Dessecação em pré-colheita com glifosato e qualidade de sementes armazenadas de soja
Carregando...
Data
2014-01-01
Autores
Toledo, Mariana Zampar
Ishizuka, Mariane Sayuri [UNESP]
Cavariani, Cláudio [UNESP]
Franca-Neto, Jose de Barros
Picoli, Lais Bilia [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Univ Estadual Londrina
Resumo
Seeds from non-genetically modified soybean cultivars harvested after chemical desiccation of plants with glyphosate may produce abnormal seedlings; these may show phytotoxicity symptoms that could persist even after some time of storage due to accumulation of toxic residues. This study aimed to evaluate the quality of stored soybean seeds harvested after chemical desiccation of plants with glyphosate at R7 stage. Seeds from soybean cultivar 'Conquista' were produced with and without desiccation with glyphosate, at the dose 2.0 L ha(-1), applied at physiological maturity stage. Seed quality was evaluated right after harvest and after eight months of storage by tests of moisture content, mass, germination and vigor. The experimental design was the completely randomized block with four replications. Data was submitted to variance analysis and means were compared by the Tukey test (p <= 0.05) as a 2 x 2 factorial. The results show deleterious effects of glyphosate used as desiccant for early harvest of soybean seeds from conventional cultivars. Accelerating plant senescence leads to production of seeds with lower germination and decreased seedling development, although the percentage of abnormal seedlings is reduced after 8 months of storage possibly due to degradation of toxic residues of glyphosate and/or derivates.
Descrição
Palavras-chave
Glycine max, phytotoxicity, physiological maturity, germination, seedling development
Como citar
Semina-ciencias Agrarias. Londrina: Univ Estadual Londrina, v. 35, n. 2, p. 765-773, 2014.