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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

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

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Conducting a Test

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

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

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

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

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

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Evaluating Catch Amounts 10 ft

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Evaluating Catch Amounts 0.8 1.2 0.3 1.0 0.7 10 ft

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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

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Lots of data !

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Problems with Systems

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

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Results

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Results, cont.

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

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Locations of Pivots Tested 2004 Tested 2003 Tested < 2003

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