The increase in research to measure the real efficiency of the use of biofertilizers based on humic acids in agriculture, especially in corn culture, is increasingly necessary. The objective of this study was to evaluate the effect of the use of Basfoliar® BlackGold biofertilizer on the productivity of "safrinha" corn, in order to determine the dose with the best agronomic response. The experiment was conducted in the field, on the Estrela do Sul Farm, in the municipality of Campos de Júlio-MT. A randomized block design with five repetitions was adopted, on a dystrophic Red Latosol with a very clayey texture. The treatments corresponded to the following doses of the humic substances biofertilizer BlackGold: 0; 0.5; 1.0; 1.5; 2.0; 2.5; 3.0 and 3.5 L.ha-1. Ten ears were harvested from each plot to count the number of ear rows, ear diameter (cm), ear length (cm), cob diameter (cm), mass of ten ears (g) and mass of one thousand grains (g), corrected to a moisture content of 13%. The BlackGold biofertilizer did not promote increases in agronomic and yield components evaluated, except in productivity, where the dose of 0.5 L.ha-1 caused an increase of 8.5 bags.ha-1 compared to the control. It was concluded for the present experiment that the use of biofertilizers of humic substances is presented as an alternative for the increase of productivity of safrinha corn, requiring the expansion of such studies to field conditions in Campos de Júlio-MT.
