Iowa farmer-cooperator’s Dick Sloan and Tim Sieren found better yields when terminating cover crops three weeks prior (19-21 days) to planting corn compared to reduced yields when terminating a few days (1-3) before planting. Sloan states, however, that it is not the timing of the termination but more so the amount of biomass that matters, “When I have good cover crop growth, I will kill it early and plant corn early, a few days after termination, to get my corn planted earlier.” Yet, for both farms, returns were highest when terminating the cover crop mixture 19 days before planting corn. Read the full study to learn more!

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