1 Where is the Profit? Corn on Corn vs Corn -SoybeansSEIARA Annual Meeting March 4, 2004

2 Corn on Corn vs. Corn on Soybeans; General ConsiderationsRotation effects on yields Rotation effects on costs of production, especially insecticides and N Market considerations Effects on pest cycles Effects of the government programs

3

4 Continuous Corn and Corn-Soybean Tillage StudyStarted in 1990 Two soil types Kalona Nira Three tillage systems No-Till Ridge/Alternative Chisel Plow-Disk

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

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

22

23

24

25

26

27

28

29

30

31

32

33 Conclusions Corn yields increase for corn following any other cropCorn/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