Como a aplicação de benzoato de sódio, a realocação e o tempo de armazenamento afetam a fermentação, a composição química e a estabilidade aeróbia da silagem de cana-de-açúcar?

Abstract

Sugarcane silages are naturally prone to dry matter (DM) losses due to intense alcoholic fermentation. The use of chemical additives, such as sodium benzoate (SB), can be efficient in reducing these losses, especially when silages are subjected to adverse conditions such as relocation processes. This study aimed to determine the effect of the application of sodium benzoate at a concentration of 0.2% of the natural matter (DM) of the ensiled mass, the time of exposure of the silages to the air during the relocation (no relocation, 12, 48 or 72 hours), and the storage time after the relocation (10 or 60 days) on the fermentation profile, microbiology, chemical composition and aerobic stability. The silages were made in plastic experimental silos with a capacity of 15 L. In the silage and in the re-esilling of the masses, densities of 476 ± 35kg MN / m³ of silo were used. The microbiology and chemical composition; the fermentative characteristics; dry matter losses; and aerobic stability were determined. The use of BS altered the chemical composition of sugarcane silage, as well as the time of exposure modified the DM contents. Silages with SB had higher losses when relocated for 72 hours while silages without additive increased losses with 48 hours of relocation. Silages stored for 60 days and relocated for 12 or 48 hours showed higher effluent losses. Stability was greatest in silages that were not reallocated. The 0.2% (NM) sodium benzoate is effective in the inhibition of yeasts and in the maintenance of the pH of reallocated sugarcane silages.