Qualidade fisiológica de sementes de soja armazenadas em diferentes condições

Abstract

The objective of this study was to evaluate the quality of seeds of RR and RR2 PRO soybean cultivars stored in a natural atmosphere with raffia packaging (ANER), in a natural atmosphere with laminated packaging (ANEL), modified atmosphere (-14 PSI) with packaging of polyethylene (AMEP), in a refrigerated atmosphere (1 to 3 ° C) with raffia packaging (ARER), in a refrigerated atmosphere (1 to 3 ° C) with laminated packaging (AREL), in a modified atmosphere (-14 PSI) and refrigerated (1 to 3 ° C) with polyethylene packaging (AMREP), over six months of storage. The experiment was characterized by a completely randomized design, with three replicates for each treatment, considering the storage conditions, the storage time and the cultivars as sources of variation. Samples of the seeds of the different treatments were carried out every two months: at zero, two, four and six months of storage to carry out the tests of water content, apparent specific mass, weight of a thousand seeds, electrical conductivity and germination. The results were analyzed by the computer program Sisvar, version 4.0 @ at 5% probability, using the Tukey average test. The results obtained showed that the seeds of cultivar RR were preserved with better physiological quality. Raffia and polyethylene packaging under natural storage conditions, with a refrigerated and modified atmosphere, did not preserve the seed quality over the storage period. Under the conditions of storage in natural atmosphere in laminated packaging (RING) and refrigerated atmosphere in laminated packaging (AREL) reduced the environmental effects of temperature and relative humidity, obtaining better results of physiological quality of the seeds. The storage time influenced the reduction of the physiological quality of the seeds, with the exception of AREL and ANEL, which maintained the qualities close to the initial conditions, throughout the six months of storage. It was concluded that the best alternative for the storage of soybean seeds over a period of six months was to laminated packaging in a natural environment, matching in terms of quality to storage in laminated packaging with a refrigerated environment.