Efeito do suco fermentado de milho como bioinoculante em silagem de cana-de-açúcar.

Abstract

This study aimed to evaluate the effect of bioinoculant doses of fermented corn juice on the fermentation and the physicochemical quality of sugarcane silage. For the degradability test the experimental design was of blocks with subdivided plots and for the other analyzes the completely randomized design was used. The treatments consisted of five proportions of the fermented juice of the corn plant (0, 200, 400, 800 and 1600 ml t-1) in sugarcane silage. The highest loss by effluents, as well as by gases, occurred in the control silage (0 ml t-1), with a difference in comparison with the bioinoculars (P <0.05), consequently the dry matter recovery was statistically lower in the silage without bioinoculant (P<0.05). There was no significant difference in relation to N-NH3 values (% NT). There was an increasing linear effect (P<0.01) of air exposure time on the silage surface temperature. For the internal temperature of the silage there was interaction with the time of exposure to air, where the highest temperature was obtained in the sugarcane silage without the bioinoculant, causing the aerobic stability to break after the 31 hours and 50 minutes. The addition of the bioinoculant increased (P<0.05) the dry matter (DM) concentration without influencing the amount of acid detergent insoluble fibers (NDF). There was an increase (P<0.05) in the amount of non-fibrous carbohydrates (CNF) in bionicolut silages. The inoculation with fermented corn juice decreased (P<0.05) the amount of butyric acid, the amount of lactic, acetic and propionic acid in ideal concentrations for silage. The bionoculant kept the microbial population similar to that of corn planting and there was no difference between the treatments (P> 0.05). All treatments presented low degradability, but the best values were in the bioinoculated silages. The use of the fermented corn juice provided a better quality of sugarcane silage compared to the control treatment, and the 200 ml t-1 dose presented the most satisfactory results and could be indicated for silage improvement.