Qualidade fisiológica de sementes de arroz irrigado - cultivar BRS AG “GIGANTE”: tratamentos pré-germinativos e armazenamento

Abstract

To obtain high yields, farmers must use high quality seeds in all their attributes in the establishment of crops. In this context, the first objective of the present work was to evaluate the period and the best method of overcoming dormancy in irrigated rice seeds of cultivar BRS AG "GIGANTE"; And the second one, to verify the effect or, storage in different packages and environments on the dormancy and physiological quality of seeds of the same cultivar. The experiments were composed of 96 and 30 treatments involving three and four factors, respectively. For both, a subdivided parcels design was used in a factorial scheme (2x8x6) and (3x2x5), with four replications. In the evaluation periods, the following tests were carried out to evaluate their physiological quality: germination, first count of germination, dormant and dead seeds, abnormal seedlings, cold test and emergence in trays, all expressed as a percentage. The main conclusions were: that for evaluation of the physiological quality of rice seeds of cultivar BRS AG "GIGANTE", there is no need to overcome dormancy, regardless of the evaluation period; The period of 100 days of storage is sufficient to cause seed dormancy of the cultivar BRS AG “GIGANT” to zero; And the multifoil paper packaging in the cold chamber and dry chamber conditions used were higher than the conventional storage conditions, maintaining the viability of the seeds until the end of the study (480 days).