1. Evaluating Center Pivots in Missouri Joe Henggeler University of Missouri University of Missouri 38th ANNUAL MISSOURI IRRIGATION CONFERENCE Wednesday, Feb. 2, 2004 309 Hearnes Center, Columbia, MO

2. Team Up! Irrigation Scheduling Irrigation Scheduling Proper fertigation (corn) Proper fertigation (corn) Testing center pivots Testing center pivots

3. Conducting a Test

6. Other Data Collected Pivot age / total hours of operation Pivot age / total hours of operation Pressure at beginning & end Pressure at beginning & end

7. Other Data Collected, cont. Type of sprinkler Type of sprinkler Weather conditions during the test Weather conditions during the test

8. Distribution Uniformity Average catch of Low Quarter Average catch DU = x 100

9. Irrigation Distribution Uniformity (DU) Average catch = 1.1” Average Low Quarter catch = 0.8”

10. Irrigation Distribution Uniformity (DU) Average catch = 1.1” Average Low Quarter catch = 0.8” DU = (0.8  1.1) x 100 = 72%

11. Evaluating Catch Amounts 10 ft

12. Evaluating Catch Amounts 0.8 “ 1.2 “ 0.3 “1.0 “0.7 “ 10 ft

13. Evaluating Catch Amounts 0.8 “ 1.2 “ 0.3 “1.0 “0.7 “ (0.8 + 1.2 + 0.3)“ 3 = 0.7 10 ft (0.3 + 1.0 + 0.7)“ 3 = 0.7 (1.2 + 0.3 + 1.0)“ 3 = 0.8

14. Lots of data !

15. Problems with Systems

16. DU Value Rating > 75% Excellent 65 – 74 % Good 50 – 64 % Fair < 49 % Poor

17. Results

18. Results, cont.

20. Straight Value Averaging Catch 50 % 67 % 82 % 86 % 30 % 45 % Average Maximum Minimum

22. Locations of Pivots Tested 2004 Tested 2003 Tested < 2003

23. The End Joe Henggeler Delta Center Research Center 573-379-5431Henggelerj@missouri.edu