Application and Coapplication of Biostimulants Enhance Corn Yield and Profitability

The introduction of biostimulants into agriculture has positively impacted both productivity and economic returns, increasing profitability per cultivated area. However, understanding the effects of their combined application is essential, as these products are increasingly integrated into commercial cropping systems. It is worth noting that the use of biostimulants is a promising tool for the development of regenerative agriculture, since their diverse compositions can help in the search for lower socioeconomic and environmental impacts, bringing benefits to producers and consumers. This study evaluated the interaction among three distinct biostimulants during corn production. The treatments included: T1—Control; T2—nicotinamide (40 g ha −1 ); T3— Azospirillum brasilense (400 mL ha −1 ); T4—Stimulate (250 mL ha −1 ); T5—nicotinamide + A. brasilense ; T6—nicotinamide + Stimulate; T7— A. brasilense + Stimulate; and T8—nicotinamide + A. brasilense + Stimulate. At harvest, ear length, ear diameter, number of grain rows per ear, number of grains per row, total number of grains per ear, grain mass per ear, 1000‐grain weight, and grain yield were evaluated. The isolated or combined application of biostimulants did not affect ear biometric traits. However, these treatments positively influenced grain filling and overall corn yield, regardless of whether the products were applied alone or in combination, which is directly associated with increased economic returns. A synergistic effect on grain yield and profitability was observed when combining biostimulants, reaching an increase of up to 40.5% in grain yield. Nonetheless, due to their lower acquisition cost, the return on investment was more favorable with the isolated or combined application of nicotinamide and A. brasilense . Our findings highlight the importance of studies focused on the economic impacts caused by the combined use of biostimulants, as well as possible implications for the environment and the community, mainly in a positive way.