Potencial fisiológico de sementes de milho híbrido tratadas com inseticidas e armazenadas em duas condições de ambiente

Abstract

Seed treatment is a widely disseminated practice in Brazilian cultural areas, which linked to other culturalpractices, has contributed to the increase in productivity, cost reduction, final product improvement,environmental damagereduction as well as good seed protection in the field level and storage. The work hadthe objective to check the insecticide effect on the germination and vigor of the hybrid maize seeds, stored intwo environmental conditions. The seeds were treated withthree insecticides, identified as: Insecticide one(Thiametoxan); Insecticide two (Neonicotinoide) and Insecticide three [Neonicotinoide +(Imidaclopride+thiodicarbe)]. After being treated, the seeds were stored for a period of 270 days, in twodifferentplaces, one with (10ºC) temperature and relative humidity (60%) and another under normalcondition of storage. During this period evaluations were accomplished every 45 days, through germinationand vigor tests. In addition to germination and cooling tests, sanitation analysis, seedling emergency and seedinoculation were carried out. After that the seeds were stored for a period of 30 days in environmental placeswith and without control of air condition. The results obtained allow to conclude that the maintenance of seedquality of hybrid maize, treated with insecticides, depends on the hybrid and chemical product used in theirtreatment and that the reduction in feasibility and vigor of seeds treated with thiametoxan is intensified due tothe storage period extension.