A population-projection model was developed for a depth-structured weed seed population (employing tywsition matrices to model seed survival, germination, and vertical movement) and plant survival and seed production. Abutflon theophrasti and Setaria viridis seedbank dynamics were simulated in continuous com and in two crop rotations (com-soybean and oatl clover-com-soybean-com). Results suggest that crop rotation can nearly eliminate S. viridis seedbanks, while A. theophrasti seedbanks are less affected. Sensitivity analysis indicated that variation in seed survivorships over winter influenced population dynamics most strongly. Other seed survivorships were also highly influential, while plant survivorships and per-plant seed production had smaller effects. These results highlight the potential value of weed control measures aimed at seed. ApPENDIX 1.

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