Abstract
Industrial seed treatment assures uniform coverage of seeds with insecticides, fungicides, micronutrients and bioestimulant at precise dose, however often resulting in higher slurry volume. Furthermore, seeds are coated long periods of time prior sowing and may influence germination and vigor. Thus, the aim of this work was to evaluate the influence of seven industrial seed treatments and their respective slurry volumes on the physiological potential of soybean seeds at 0, 15, 30, 45, 60 and 90 days of storage. In each storage period, the variables germination, accelerated aging test and emergency speed index were evaluated and studied in the repeated measures in time model. The products used were: fungicide (thiabendazole, fludioxonil and mefenoxam), insecticide (thiametoxam), insecticide/nematicide (abamectin), micronutrients (cobalt and molybdenum), bioregulator, drying powder and polymer. High volumes of seed-coating mixtures reduce the physiological quality of soybean seeds over storage. However, the slurry composition also influenced on the maintenance of the seed germination and vigor throughout the storage.
Highlights
The use of seeds of high physiological and sanitary quality plays a crucial role in plant stand and, in crop yield
In Brazil, the second-largest soybean [Glycine max (L.) Merrill] producer worldwide (Organisation for Economic Co-operation and Development [OECD]-FAO, 2017), the market of treated soybean seeds reaches more than 95% of the sown area, with the industrial seed treatment (IST) comprising about 66 % of the total market-share (Henning, França-Neto, Krzyzanowski, & Lorini, 2010)
Since several products can be employed, often the IST result in higher slurry volumes than that performed on farm
Summary
The use of seeds of high physiological and sanitary quality plays a crucial role in plant stand and, in crop yield. Not often sowing takes place in areas free of pathogens or insect threats, treating seeds with agrochemicals prior sowing is a way to guarantee seedling development, either by controlling early pests or diseases or by reducing the risk of their establishment in intact areas (Balardin et al, 2011; Pereira et al, 2011) In this context, in Brazil, the second-largest soybean [Glycine max (L.) Merrill] producer worldwide (Organisation for Economic Co-operation and Development [OECD]-FAO, 2017), the market of treated soybean seeds reaches more than 95% of the sown area, with the industrial seed treatment (IST) comprising about 66 % of the total market-share (Henning, França-Neto, Krzyzanowski, & Lorini, 2010). Unlike the treatment performed, in the IST seeds are coated weeks or months prior sowing (Strieder et al, 2014), which may influence germination and vigor, over storage
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