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O objetivo do presente trabalho foi avaliar a qualidade fisiológica e sanitária das sementes de soja, tratadas com fungicida, armazenadas em um sistema de armazenamento a frio. As sementes, tratadas com o fungicida Difenoconazole na dose de 0,05g i.a./kg de sementes, foram armazenadas na porção superior de duas pilhas de 1.200 sacos cada, no 23° lastro (penúltimo), em diversas posições em relação ao duto central de aeração do sistema a frio. Durante um período de oito meses, as sementes foram avaliadas quanto à germinação, vigor (envelhecimento acelerado, emergência em campo e tetrazólio) e sanidade (método do papel filtro). As sementes de soja, armazenadas na parte superior das pilhas, sofreram redução da qualidade fisiológica após dois meses de armazenamento. As sementes tratadas com fungicida apresentaram melhor desempenho nos períodos iniciais de armazenamento. A redução média de umidade das sementes de 0,6 pontos percentuais por mês de armazenamento não diminui suficientemente o processo de deterioração em sementes de soja. The objective of this study was to evaluate physiological quality and health of soybean seeds, treated or not with fungicide Dipheconazol in the dosage of 0,05g i.a./kg- of seeds, in an open storage with cooling system. The seeds stored in the upper portion of two piles of 1.200 bags each, in the 23rd ballast (penultimate), in several positions in relation to the central duct of aeration of the cooling system, were evaluated for standard germination, vigor (accelerated ageing, field emergence and tetrazolium) and health (blotter test) during a period of eight months. Soybean seeds with initial moisture content of 14%, store in the upper part of the piles with cooling aeration system, reduced its physiological quality after two months of storage. The seeds treated with fungicide showed better performance in the initial periods of storage, but not after four months. The seed moisture content variation over the storage period was significant, starting with 14% ending with 10%. After 30 days, even so, the seeds still showed 13,8% moisture content, being probable the cause of reduction of the physiological quality. The reduction of 0,6 percentage points per month of storage was not sufficient to delay deterioration effects on seeds

Armazenamento em sistema a frio de sementes de soja tratadas com fungicida