Abstract
Abstract: The aim of this study was to evaluate the effect of industrial seed treatments on the physiological potential of soybean seeds over storage. Four mixtures of agrochemical products in association with two fertilizers were tested. The agrochemical product mixtures were carbendazim/thiram + imidacloprid/thiodicarb; pyraclostrobin, thiophanate-methyl, and fipronil; thiophanate-methyl/fluazinam + bifenthrin/imidacloprid; and metalaxyl-m/fludioxonil + thiamethoxam. The two fertilizers were 7% N, 16% P2O5, 0.6% Co, and 2.5% Mo; and 1% Co, 10% Mo, and 7% P2 O5. The experiment was carried out in a completely randomized design in a split-plot arrangement in time, with four replications. The treatments were allocated in the plots, while the storage periods (0, 30, 60, 90, and 120 days) constituted the split-plots. The following tests were carried out in each period: first count of germination, germination, accelerated aging, emergence speed index in sand substrate, and final seedling emergence in sand substrate. Seed germination and vigor declined over the storage period, especially after industrial treatment. Pesticide mixtures of a carbendazim/thiram fungicide base and an imidacloprid/thiodicarb insecticide base most impaired seed physiological potential throughout storage, regardless of fertilizer use in the industrial treatment.
Highlights
The use of high quality seed plays an important role in plant stand and, in agricultural crop yield.sowing of seeds rarely occurs in areas free of threats to plant health, leading the producer to make use of chemical fungicide or insecticide seed treatments
Sowing of seeds rarely occurs in areas free of threats to plant health, leading the producer to make use of chemical fungicide or insecticide seed treatments
Treatments consisted of the combination between five storage periods (0, 30, 60, 90, and 120 days) with four combinations of agrochemical pesticide products normally used in industrial treatment of soybean seeds and two fertilizer formulations
Summary
The use of high quality seed plays an important role in plant stand and, in agricultural crop yield. Sowing of seeds rarely occurs in areas free of threats to plant health, leading the producer to make use of chemical fungicide or insecticide seed treatments. In this scenario, soybean (Glycine max) stands out as the main agricultural. It is estimated that more than 95% of the area sown to soybean in Brazil makes use of chemically treated seeds (Henning et al, 2010), and industrially treated seeds represented 66% of total seeds sold in 2015 (França-Neto et al, 2015). As low application rates of these elements are required, demand for the use of these elements together with chemical treatment is growing, above all when the seed lots are treated in accordance with producer demand
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