Evaluating

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Field Evaluation of Center Pivot Sprinkler Irrigation Systems In Michigan

Report Prepared by: Sabah Almasraf, Jennifer Jury and Steve Miller Department of Biosystems and Agricultural Engineering Michigan State University

March 2011

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Table of Contents
Introduction ..................................................................................................................................... 5 Background and Recent Research ................................................................................................... 7 Objectives ........................................................................................................................................ 8 Study Area and Systems Description ............................................................................................... 8 Methodology and Equations ........................................................................................................... 9 Results and Discussions ................................................................................................................. 12 Fertigation based on Uniformity ................................................................................................... 18 Recommendations......................................................................................................................... 18 Acknowledgements ....................................................................................................................... 23 References ..................................................................................................................................... 24 Appendix A .................................................................................................................................... 25 Appendix B..................................................................................................................................... 30 Appendix C..................................................................................................................................... 36

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List of Tables
Table 1. Specifications for the selected field tests. Table 2. Summary of the CU and DU for each test. Table 3. Comparison of Uniformity Coefficients. Table 4. Comparison of water volume applied. Table 5. Potential Application Efficiency (PELQ) Table 6. Number of acres that receive different amounts of Nitrogen in Test 4. Table 7. Soil type analysis for each evaluation field 11 13 15 16 17 21 36

List of Figures
Figure 1. Area covered by each sprinkler increases as the distance from the pivot center increases. ............................................................................................................................. 6 Figure 2. Map of Tekonsha, Marshall, and Constantine MI. where evaluations tests were conducted. ........................................................................................................................... 9 Figure 3. Uniformity Coefficient and Distribution Uniformity for all evaluation tests.... 14 Figure 4. Nitrogen distribution based on water applied and sprinkler system uniformity in test 4. ................................................................................................................................. 19 Figure 5. Nitrogen distribution in test 4 assuming 65 lbs/acre applied over the season by fertigation in test 4. ........................................................................................................... 20 Figure 6. Graph based on 200 lbs nitrogen application over a season via fertigation in test 4......................................................................................................................................... 20 Figure 7. Nitrogen application was calculated on test 2 with the greatest uniformity rating (89%) assuming all nitrogen is applied via fertigation (200 lbs. over the season). .......... 21...
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