Extended Data Fig. 6: Yield and planting date effects do not clearly diminish with longer adoption periods.

Panels show estimates of yield (left) and planting date (right) impacts when subsetting fields from the original treatment sample (3+ years of cover crop adoption) to more restrictive samples that consider fields with longer adoption histories. Data are presented as point estimates (means) ± 95% confidence intervals, based on standard errors clustered at the state level. The number of cover-cropped fields in each group is shown below each point in the figure, separately for corn and soybean.