Qualidade de lotes em resposta ao beneficiamento e ao tratamento de sementes de arroz

Abstract

This study aimed to evaluate the quality of different lots of IRGA 424 RI seeds collected in different periods after processing. Another objective was to evaluate the action of seed treatment in two irrigated rice cultivars IRGA 424 RI and IRGA 426 CL. In the first assay, five different lots of seeds of the cultivar IRGA 424 IR were used, collected in three periods after processing, before seed treatment and after seed treatment, and the variables germination, accelerated aging, cold vigor and sanitary quality of the seeds were analyzed. In the second assay, the physiological and sanitary quality of seeds submitted to treatment with fungicides, insecticides (Standak top, Maxim XL, Cruiser Opti) and the same treatments associated with seed protector (Permit Star) were evaluated, the variables germination, cold vigor and sanitary quality of seeds were evaluated. In both trials, a completely randomized design was used. Considering the results obtained, it is possible to separate the lots of rice seeds in the analyzed stages. Seed treatment helps to maintain quality after the storage period and is efficient in decreasing the incidence of fungi. As for the seed treatment of the cultivars IRGA 424 RI and IRGA 426 CL did not affect the physiological quality, and when added the seed protector had an effect on reducing the physiological quality of the cultivar IRGA 426 CL. In all treatments containing fungicide take greater effectiveness in the control of fungi.