 Again, 800-741-GOLD. Paid for by Advantage Gold. Performance may vary. Past performance is not indicative of future results. Always consult your financial and tax professional. Yield results show that making in-season applications in biologicals pays. I'm Darren Hefty with Hefty Naturals. A mask is a biostimulant package designed to be applied to corn and soybeans just as the reproductive stages begin. By boosting development at this timing, a mask helps your crop maximize yield potential at harvest.