





Soybean Replant Decision

Once we can get back into the fields the decision to replant will be based on the yield potential of the current stand relative to the cost and yield potential of the replanted soybean field (see table below). Before any decision to tear up a field is made, make sure you contact your crop insurance agent to discuss coverage and you have the replant seed on your farm or at least en route. As we all know seed supplies are tight and replant acres will be high. Also remember to check herbicide labels for plant back restrictions if you are planning to plant soybean into a flooded corn field.

soybean plant population table

Since full-season maturity group soybeans are unrealistic for planting this late, only early and mid-group soybean cultivars should be considered. The average yield potential for soybean planted in late June in southern WI is in the 30-35-bu yield range (Figure 1). For yield potential and harvestability, (a combine may not be able to pick up the lower pods) a grower should plant, if possible, a mid-maturity group soybean instead of an early maturity group for their geographic area.

To maximize yield potential in late-planted soybean, a minimum of 180,000 plants/acre is required in a drilled system as yield potential in rowed beans would be significantly reduced due to decreased canopy development. To achieve 180,000 plants/acre, a grower may have to seed as many as 225,000 seeds/acre.

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