Épocas de aplicação de fungicidas e seus efeitos sobre a qualidade fisiológica e sanitária de sementes de soja

Abstract

This work was carried out with the objective of evaluating fungicide application period in physiological and health of soybean seed quality. The first fungicide application was done when the soybean plants were in R1 stage (50% of flowering); the second application 20 days after and de third, 40 days after the first one. The fungicide used was Trifloxystrobin + cyproconaxole (Sphere) with the dose of 56, 2+24 g i.a.ha-1. The cultivars were CD 215 and CD 202, being the last one, the most cropped in the west region of Paraná State. This work was established in Coopavel Experimental Field, located in Cascavel, Paraná. The results indicated that yield and 1,000 seeds weight were determinate by the number of fungicide applications; that the fungicide application number do not affect physiological quality and that the fungi detected in soybean seeds is determinate by the harvest period and that there is a negative relation between fungi amount and physiological seed quality.