ARMAZENAMENTO DE SEMENTES TRATADAS COM FUNGICIDAS NO DESEMPENHO DA CULTURA DA SOJA

Abstract

The objective of the present work was to evaluate the beneficial qualities of soybean seeds through the application of fungicides in seed treatment and to verify the phytotoxic effects, submitted to storage or not. For this, experiments were carried out, combining five treatments, three storage periods and four replications. The soybean cultivar used was NA5909RR and treatments were Standak Top (pyraclostrobin + methyl thiophanate + fipronil - 100 g ai / 100 kg seed), Orkestra (fluxapiroxade + pyraclostrobin - 150 g ai ha-1 ), Certeza (thiophanate (Trifloxystrobin + prothioconazole - 105 ml ha-1 ) plus one control without application and storage periods of 0, 15, and 30 days. The experiments were carried out first in a laboratory of seed analysis with the evaluations of IVE and germination, the second site was in the field with stand evaluations, plant heights and dry shoot mass, productivity indexes, and the third in a greenhouse where gas exchange and fluorescence were evaluated. It was observed that all the fungicides had visual and physiological changes in the soybean crop. Fungicides based on pyraclostrobin + methyl thiophanate + fipronil, flavonoxad + pyraclostrobin and methyl thiophanate + fluazinam are effective in the treatment of seed and the base of trifloxystrobin + prothioconazole xii reduces the physiological quality. Post treatment storage negatively influences seed quality. Regarding physiology, there are negative effects when using fungicide based on trifloxystrobin + prothioconazole.