Influência sobre a germinação da aplicação de dois tipos de fungicidas com diferentes dosagens em sementes de soja

Abstract

Being the soy the annual culture of larger economical importance in the national scenery, and the seed treatment with fungicides a fundamental stage preceding the establishment of the culture, it is done necessary to know the ideal concentrations of fungicide to be applied in the seeds, in order to optimize the production and to reduce the costs and impacts caused by the too much use of fungicides. Before that, the objective of that work is to identify the facts caused by different doses of fungicides in the treatment of soy seeds. The experiments were driven at the laboratory of vegetable physiology of the Universidade Federal da Fronteira Sul (UFFS) border in the campus Cerro Largo/ RS. The delineamento was Used casualizado (DIC) entirely, both with 4 treatments and 8 repetitions. Seeds were used of cultivating TEC 7849 IPRO, treated with two fungicides both with mechanism of systemic action and of contact. The experiment A: Carbendazim + Thiram (0, 100, 200 and 300 mL. 100 kg - ¹ of seeds); and I try B: Metalaxil-M + fludioxonil: (0, 50, 100 and 150 mL.100 kg - ¹ of seeds). The accomplished evaluations consisted of germination test, percentile of plantules normal, abnormal and seeds died, as well as energy test and tetrazólio in portion of pure seeds, to prove the viability of the lot. Both experiments have results similar where possible to observe that those fungicides present fitotoxidade in the plants, when used in recommended superior doses them for their respective manufacturers, they turn the germination and slow emergency, or they still inhibit entirely the process germinativo, taking the seed the death.