Abstract
Abstract: This work evaluated the efficiency of accelerated aging test to determine the physiological potential in treated soybean seeds with fungicides and insecticides, in addition to analyzing the concordance between the results obtained by different accelerated aging methods with the actual results of the physiological quality in seeds after the storage. The study was divided into two experiments, both with entirely randomized delineation, with four replications. In the first experiment, seed germination was evaluated after imposing some treatments that were arranged in a 3 x 2 x 3 factorial scheme: seed treatment (imidacloprid + thiodicarb; fipronil + thiophanate methyl + pyraclostrobin; no treatment); vigor levels (high; low); and accelerated aging (traditional; saturated NaCl solution; no aging). In the second experiment, seedling emergence was evaluated after applying some treatments that were arranged in a 3 x 2 x 2 factorial scheme: seed treatment (imidacloprid + thiodicarb; fipronil + thiophanate methyl + pyraclostrobin; no treatment); vigor levels (high; low); storage time (0 and 135 days). The accelerated aging methods were efficient to determine the physiological potential of the seeds, in which, the NaCl method presented better results. The physiological potential of soybean seeds decreased throughout storage and the application of chemicals in seed treatment impaired the germination and emergence percentages, regardless of the active ingredient used. The accelerated aging method with NaCl presents greater agreement with the actual storage results.
Highlights
Soybean currently occupies about 59% of the cultivated area for grain production in Brazil, placing the country among the world’s largest grain producers (CONAB, 2020)
Several physiological tests have been recommended for assessing the vigor of soybean seeds, including the accelerated aging, which had been internationally recognized for years as the most widely used to assess the physiological potential of various legume species, providing information with a high degree of consistency (Tekrony, 2003)
The first aimed at checking the efficiency of accelerated aging testing to determine the physiological potential of treated soybean seeds, while the second aimed to understand if the influence of the chemical treatment varies depending on seed vigor level and storage time
Summary
Soybean currently occupies about 59% of the cultivated area for grain production in Brazil, placing the country among the world’s largest grain producers (CONAB, 2020). Several physiological tests have been recommended for assessing the vigor of soybean seeds, including the accelerated aging, which had been internationally recognized for years as the most widely used to assess the physiological potential of various legume species, providing information with a high degree of consistency (Tekrony, 2003). This test has as principle the increase of the deterioration rate by the exposure of the seeds to high levels of temperature and relative air humidity, both considered preponderant environmental factors that impact on the intensity and speed of deterioration (Delouche, 2002), simulating inadequate conditions of storage (Marcos-Filho, 2015). This work evaluated the efficiency of accelerated aging test to determine the physiological potential in treated soybean seeds with fungicides and insecticides, in addition to analyzing the concordance between the results obtained by different accelerated aging methods with the actual results of the physiological quality in seeds after the storage
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