Spraying fulvic acid, a natural soil-derived compound, on young wheat sharply reduced damage from drifting glyphosate herbicide. Applying it a few days before the drift worked best, and mixing it with the herbicide left no visible damage.
1
Fulvic acid at 5 g/L was the optimum dose out of six tested (1, 3, 5, 7, 10, 15 g/L) against simulated glyphosate drift at 3% of the recommended weed-kill rate.
2
Treated wheat had more biomass, longer roots, more chlorophyll, better gas exchange, and higher shoot Cu, Mn, Fe, and Zn than untreated drift-exposed plants.
3
Applying fulvic acid 3 days before glyphosate beat same-day application; mixing it with glyphosate caused no observable damage; cultivar Magenta was less sensitive and benefited more than Scepter.
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