Sidedress Biologicals: Placement Matters More Than You Think
Trial Objective
Can biological products improve performance when applied later in the season?
Results
Adding biologicals at sidedress: little to no yield increase
ROI did not improve significantly [2025 DIRT Book (1) | PDF]
Why?
Biologicals depend on:
Root colonization
Early soil interaction
Late placement limits their impact.
Conclusion
Biologicals are most effective when applied early, not mid-season.