Rendimento e valor nutricional de silagem de sorgo inoculada com Azopirillum brasilense

Abstract

In order to intensify livestock in semi-arid regions, it is essential to conserve roughage in the form of silage to supplement the forage deficit in the dry season. Among the crops indicated, sorghum stands out, which requires less water compared to maize. The objective was to evaluate five sorghum hybrids (Volumax, 201813B, 201814B, 201709B, BRS716) associated or not with Azospirillum brasilense and nitrogen fertilization (N) on productivity, fermentation profile and nutritional value of silages. Five sorghum hybrids were evaluated with three strategies of nitrogen fertilization using Urea, Azospirillum brasilense and the association Urea/A. brazilian. The design was in randomized blocks in a 5 x 3 factorial scheme (five hybrids and three fertilization strategies) with three replications. There was no interaction between the sorghum hybrid factors and nitrogen fertilization strategies on the structural, productive and chemical characteristics of the fresh sorghum plant. The biomass sorghum hybrids showed higher dry matter production than the forage Volumax. There was no difference between silages of sorghum hybrids on pH, gas losses, dry matter recovery, concentration of acetic acid, propionic acid and ethanol. The biomass sorghum hybrids 201709B and BRS 716 showed better digestible DM productivity.