Vanessa Dias Rezende Trindade, Ronaldo da Silva Viana, Marco Eustaquio de Sa, Fernando Buzo, Glaucia Amorim Faria, Andre Lus Silva Maximo
Abstract: Sorghum is grass with high production potential in periods with water deficit due to its tolerance metabolism to certain adverse conditions. Thus, this crop has become the primary alternative for replacing corn in rations in the meat production sector. Thus, the objective was to evaluate agronomic characteristics of sorghum submitted to different doses of algae extract in the presence or absence of Bacillus subtilis. A randomized complete block design was used in a 5x2 factorial scheme, with five doses (0.0, 0.5, 1.0, 1.5 and 2.0 L.ha-1) of seaweed extract and two situations ( absence and presence of B. subtilis at a dose of 1.0 L.ha-1), with four repetitions each treatment. The analyzed variables plant height and stem diameter were evaluated at 14, 21, 28, 35 and 42 DAS. Root volume, root dry matter, shoot dry matter and root dry matter/root volume ratio were evaluated at 42 DAS at the time of the experiment harvest. The stem diameter was higher at zero doses of algae extract and for Bacillus subtilis application, but the absence of the bacteria promoted higher root volume. Thus, with the increase of the stem diameter, it is possible to accumulate photoassimilates, increasing the dry mass content produced.
Keywords: diazotrophic bacteria, productivity, biomass