Tratamentos de sementes de arroz irrigado e períodos de armazenamento

Abstract

Seed is the main input of a crop. Therefore, the use of quality seeds and techniques that help the initial development of the crop, are fundamental to ensure a good production. The objective of this work was to evaluate the influence of the chemical treatment of rice seeds with fungicide, insecticide and seed protector in storage periods. Two cultivars of irrigated rice were used, BRIRGA 409 and IRGA 424 RI. The cultivars were analyzed separately. For each cultivar the experimental design was completely randomized, in a 3 x 5 factorial scheme, with three seed treatments and five storage periods, with four replications. The treatments were: 1- fungicide + insecticide + Permit star®; 2- fungicide + insecticide; 3- without seed treatment. The storage periods were 0, 5, 15, 30 and 60 days before the seed germination test. A germination test was performed in the laboratory and emerged in the field. In the laboratory, the number of normal, abnormal plants, root length and aerial part were evaluated. The storage time of the seeds presented variation in the germination of seeds in the laboratory, however, at the end of the experiment the percentage was above 80%. Seed treatments promoted a greater number of seedlings emerged in the field. The use of the seed protector (Permit star®) did not influence the initial establishment of seedlings in the field.