Abstract
Abstract: Seeds treatment is a relevant factor in the soybean production system. The aim of this work was to evaluate composition and volumes of slurry used in industrial treatment of soybean seeds, and their physiological quality during storage. The experimental design was completely randomized, in a 20x4 factorial scheme, i.e. 20 seeds treatments and four storage periods (0, 30, 90 and 150 days). Seeds of the cultivars NS7667IPRO and NS7709IPRO were used. The slurry composition tested were a combination of fungicide and insecticide Standak top® (Fipronil + Piraclostrobin + Thiophanate Methyl), polymer L551Incotec® and water, in order to obtain the volumes of 450, 700 and 1200 mL.100 kg of seeds-1, and the controls treatment. The physiological quality was assessed by germination in sand and accelerated aging tests. Genotypes showed distinct tolerance to seed treatment industrial , slurry volumes and storage. Treatments with Standak top®, polymer and water, with volumes of up to 1200 mL.100 kg seed-1, and stored for 150 days in cold chamber were not harmful for germination of cultivar NS7667IPRO. As for cultivar NS7709IPRO, the tolerance was 90 days. Treating seeds with large slurry volumes is detrimental to maintain seeds vigor during storage, with depreciation after 30 days, especially with water predominance.
Highlights
Soybean culture contributes significantly to Brazilian exports
Dan et al (2010) reported that seeds treated with certain insecticides exhibited a negative interference with the physiological quality throughout the storage, a fact identified by Piccicin et al (2013)
In the germination in sand and vigor assessed by the accelerated aging test, according to the analysis of variance, a significant effect was observed for all sources of variation, seed treatment and storage, in isolated manner, and with significant interaction in both cultivars
Summary
Soybean culture contributes significantly to Brazilian exports. In the 2016/2017 crop, it occupied an area of 33.9 million hectares, which accounted for 30.9% of worldwide production (CONAB, 2017). In order to sustain this growth, it is necessary to adopt innovations in the production system and to introduce new technologies to boost production, and many of them are propagated through seeds. In this sense, seed producer companies have been adopting seeds treatment in the industry (Ferreira et al, 2016). In this process, seeds are treated in the beneficiation line, and they are bagged and stored until the moment of sowing. The industrial treatment of seeds may present some limiting factors, such as negative effects that the active ingredients might cause on seeds during storage, and later in field (Brzezinski et al, 2015). Dan et al (2010) reported that seeds treated with certain insecticides exhibited a negative interference with the physiological quality throughout the storage, a fact identified by Piccicin et al (2013)
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