Pre-packing cooling and types of packages in maintaining physiological quality of soybean seeds during storage.

Seeds storing under appropriate conditions reduces the speed of the seeds deterioration process. The aim of this study was to evaluate pre-packing cooling and types of packages in the maintenance of the physiological quality of soybean seeds during storage. The completely randomized experimental design was used, with four replications, considering a factorial arrangement involving or not the pre-packing cooling of the seed mass, three types of packages (multi-layer paper bag, big bag, and polyethylene container), and five storing periods (0, 2, 4, 6 and 8 months). The physiological quality was evaluated by the tests of first germination count, germination, accelerated aging, electrical conductivity, emergence speed index and emergence. The use of packages with larger amount of seeds (big bag and polyethylene container) did not favor the maintenance of the pre-packing cooling temperature. The types of packages did not show significant differences in the seeds viability during storage, up to eight months, regardless the pre-packing cooling. The cultivars seeds showed different tolerance to storing, i.e. seeds of the cultivar TMG 1176 had lower storing potential comparing to the seeds from the cultivar SYN 9074. [ABSTRACT FROM AUTHOR]

O armazenamento de sementes sob condições adequadas reduz a velocidade do processo de deterioração de semente. O objetivo com o trabalho foi avaliar o resfriamento pré-envase e tipos de embalagem na manutenção da qualidade de sementes de soja ao longo do armazenamento. Utilizou-se o delineamento experimental inteiramente casualizado com quatro repetições, em arranjo fatorial envolvendo ou não o resfriamento da massa de sementes antes do envase, três tipos de embalagens (sacaria de papel multifoliado, big bag e contêiner em polietileno) e cinco épocas de armazenamento (0, 2, 4, 6 e 8 meses). A qualidade fisiológica foi avaliada por meio de testes de primeira contagem de germinação, germinação, envelhecimento acelerado, condutividade elétrica, índice de velocidade de emergência e emergência. O uso de embalagens com maiores quantidades de sementes (big bag e contêiner) não favoreceu a manutenção da temperatura do resfriamento pré-envase. Os tipos de embalagem não proporcionaram diferenças na viabilidade de sementes de soja ao longo do armazenamento, até oito meses, independente do resfriamento antes do envase. As sementes das cultivares apresentaram diferentes tolerâncias ao armazenamento, sendo que as sementes da cultivar TMG 1176 RR possuem menor potencial de armazenamento em relação às sementes da cultivar SYN 9074 RR. [ABSTRACT FROM AUTHOR]

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