Fertilizante mineral na proteção de milho contra Fusarium sp., em casa-de-vegetação

Abstract

Due to monoculture, the increase in plant diseases has increased in recent years, which leads to a decrease in grain yield and quality, such as in corn. In order to evaluate the effect of resistance inducing product on corn [Zea mays L.], an experiment was carried out in a greenhouse, located at UFMT, city of Sinop, northern Mato Grosso. The statistical design used was completely randomized, with five treatments and five repetitions, using hybrid Limagrain 3040VIP3. The mineral fertilizer was applied in association with fungicide Trifloxystrobin+Tebuconazol and the adjuvant Soybean Oil Methyl Ester, with 3 applications at intervals of 15 days starting at the stage V8 (eighth leaf), when the axillary buds begin to transform into cob primordial and define the number of grains in each spikelet that will form in each plant. The treatments were: T1- Trifloxytrobin+Tebuconazol; T2- Trifloxytrobin+Tebuconazol and mineral fertilizer 0,5 L.ha-1; T3- Trifloxytrobin+Tebuconazole and mineral fertilizer 1,0 L.ha-1; T4- Mineral fertilizer 1,0L.ha-1; T5- Control (water). Through the analysis of the results of this experiment, it can be concluded that: a) Applications of Trifloxytrobin+Tebuconazol and mineral fertilizer 1,0 L.ha-1reduce by 61,07% the severity of Fusarium sp. in inoculated corn plants and 90,84% reduction in disease severity in uninoculated plants; b) Applications of 1,0 L.ha-1 mineral fertilizer, provide a reduction of 60,07% in disease severity in inoculated plants, possibly by activating defense mechanisms in the plants.