1. Economics of Alternative Rotations North Central Research Association March 11, 2004

2. Rotation Considerations Impact on yields Impact on costs, especially nitrogen and pesticides Relative market prices Government program considerations

3. Rotation Considerations - Seven alternative rotations - Continuous corn, Spring and Fall N - CCCO - CSb - CSbCO - CCOM - COMM - Four N levels - 0, 80, 160, 240

11. Assumptions N at $.25 per pound Corn after corn $164 variable cost First year corn $152 variable cost Oats $36 plus P and K removed variable cost; $1.25 per bu., 44, 50 lb. small square bales at $1.75 per bale Hay $84 plus P and K removed variable cost; $80 per ton

17. Conclusions Soil types have significant impact on results Corn soybean rotation and CSbCO relatively equal in returns Price does have an impact Very pronounced yield impacts which are partially offset by N level

18. Corn on Corn vs. Corn on Soybeans; Long Term Field Studies Rotation fertility studies from 1979 Rotations: CC, CSb, CCSb, CCCSb, Sb 4 N levels: 0, 80, 160, 240 Data from Ken Peckinovsky and Antonio Mallarino

25. Conclusions Evaluate the whole rotation, not a single crop Soil types have significant influence on results Corn yields increase for corn following any other crop Corn/Soybean is the most profitable rotation with CCSb second under normal conditions Significant pest pressure with more severe impact on soybean yields will influence the results Market prices influence most profitable rotation but C/Sb still is most profitable