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Desempenho de sementes de soja tratadas com inseticidas e submetidas a diferentes períodos de armazenamento RESUMOO presente trabalho teve como objetivo avaliar o desempenho fisiológico de sementes de soja armazenadas sob tratamento com inseticidas. Para tanto, as sementes de soja da cultivar M-SOY 6101 foram submetidas a quatros períodos de armazenamento (0, 3, 5 e 7 dias após o tratamento) e sete inseticidas. O delineamento experimental foi o inteiramente casualizado, em esquema fatorial 4 x 7, com quatro repetições. As sementes foram tratadas com os inseticidas thiamethoxam, fipronil, imidacloprid, imidacloprid + thiodicarb, acefato e uma testemunha, sem tratamento. As variáveis analisadas foram: germinação, velocidade de emergência, comprimento de raiz e de plântula, redução de matéria seca e porcentagem de plântulas normais no teste de envelhecimento acelerado. A aplicação dos inseticidas carbofuran, acefato, imidacloprid e imidacloprid + thiocarb é prejudicial à qualidade fisiológica das sementes de soja, cultivar M-SOY 6101, armazenadas por um período de até 7 dias. As sementes de soja tratadas com os inseticidas thiamethoxam e fipronil alcançaram níveis adequados de germinação e vigor, independentemente do período de armazenamento. Palavras-chave:Armazenagem, germinação, tratamento de sementes, vigor.Performance of soybean seeds treated with insecticides and subjected to different storage periods ABSTRACTThis study aimed to evaluate the physiological performance of soybean seeds stored under treatment with insecticides. The seeds of the cultivar M-SOY 6101 were subjected to four storage periods (0, 3, 5 and 7 days after treatment) and seven insecticides. The experimental design was completely randomized in a 4 x 7 factorial scheme with four replications. The seeds were treated with the insecticides thiamethoxam, fipronil, imidacloprid, imidacloprid + thiodicarb, acephate and a control without treatment. The analyzed variables were: germination, emergence speed, root and seedling length, dry matter reduction and normal seedlings percentage in the accelerated aging test. The application of the insecticides acephate, carbofuran, imidacloprid and imidacloprid + thiodicarb is harmful to the physiological quality of soybean seeds, cultivar M-SOY 6101, stored for a period up to seven days. Soybean seeds treated with the insecticides thiamethoxam and fipronil reached proper germination and vigor levels, regardless of the storage period.

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Bio-activators such as thiamethoxam have been used to increase the productive potential of plants, by means of metabolic and plant morphology modifications. Nevertheless, very little is known regarding the effectiveness of this insecticide when incorporated into lower quality level soybean seeds, particularly during storage. The objective of this work was to assess the influence of thiamethoxam on the physiological potential of soybean seeds with different initial vigor levels during four storage periods. Three vigor levels of cultivar Anta-low (35%), medium (70%) and high (85%) vigor-of soybean seeds were utilized in this experiment. The experimental design was completely randomized in a 3 × 2 × 4 factorial scheme-3 levels of vigor (low, medium and high); 2 seed treatments (with and without thiamethoxam) and 4 storage periods (0, 30, 60 and 90 days). The analyzed variables were: germination, first germination count, accelerated aging test, seedling length and emergence speed index. Thiamethoxam-treated soybean seeds benefit the physiological potential of both medium and high vigor seeds during storage up to 30 days. Whereas, the use of thiamethoxam was shown to be ineffective in improving the physiological quality of initial low vigor seeds.

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