Abstract
This study aimed to relate the smallest set of variables that compose the quality of soybean seeds lot under study, as well as to evaluate the influence of four industrial seed treatments and their respective slurry volumes on the physiological potential. The experiment was carried out in a completely randomized block design with 4 replicates and 24 treatments. The chemical treatments were: control (T1), micronutrient + polymer + drying powder (T2), bioregulator + polymer + drying powder (T3) and micronutrient + bioregulator + polymer + drying powder (T4). The seeds were stored for periods of 0, 15, 30, 45, 60 and 90 days and were subsequently evaluated for their physiological potential. In each storage period, the variable germination, first count, accelerated aging, emergence speed index, final emergence in the sand substrate, aerial part length, root length and total seedling length were evaluated. The main components of the standard germination test and first count were the ones that most contributed to explaining the variability of the original data. Increasing the volume of the slurry in the industrial seed treatment reduces the physiological quality of soybean seeds during storage.
Highlights
Ensuring the quality of a seed lot is essential to obtain high productivity since it provides producers with security regarding the physical, sanitary, genetic, and physiological attributes of the seeds
Besides the addition of micronutrients and biostimulant growth products have been added to soybean seed treatment mixes, with a report of beneficial effect on plant physiology and the increase in the number of flowers and roots (Klahold et al 2006)
The industrial seed treatment (IST) was performed in a continuous seed coating device, which was subsequently placed in kraft paper bags and maintained in laboratory environmental conditions
Summary
Ensuring the quality of a seed lot is essential to obtain high productivity since it provides producers with security regarding the physical, sanitary, genetic, and physiological attributes of the seeds. Widely used in on-farm treatment, the use of cobalt and molybdenum in industrial seed treatment (IST) is still incipiently employed. Both micronutrients are indispensable for success in the biological fixation of atmospheric nitrogen, a process carried out by bacteria of the genus Bradyrhizobium spp., when in symbiosis with soybean culture (Sfredo & Oliveira, 2010). The high volume of slurry used in the IST has been reported to be able to accentuate the deleterious effects of the seed deterioration process, especially during storage (França-Neto et al 2015)
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