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Limited Irrigation Management Decision Tools Norman Klocke, Kansas State University

Limited Irrigation Management Decision Tools Norman Klocke, Kansas State University. 5 th National Decennial Irrigation Conference December 7, 2010 Phoenix, Arizona. Klocke-. Collaborators. Loyd Stone, Soil Physics, KSU, Manhattan Troy Dumler, Ag Economist, KSU, Garden City

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Limited Irrigation Management Decision Tools Norman Klocke, Kansas State University

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  1. Limited Irrigation Management Decision ToolsNorman Klocke, Kansas State University 5th National Decennial Irrigation Conference December 7, 2010 Phoenix, Arizona Klocke-

  2. Collaborators • Loyd Stone, Soil Physics, KSU, Manhattan • Troy Dumler, Ag Economist, KSU, Garden City • Steven Briggeman, Sprout Software, KC, MO • Dale Bolton, Data Processing, KSU, Garden City • This research was supported in part by the Ogallala Aquifer Program, a consortium between USDA-Agricultural Research Service, Kansas State University, Texas AgriLife Research, Texas AgriLife Extension Service, Texas Tech University, and West Texas A&M University. Klocke-

  3. Questions for Limited* Irrigation Management Using Economic Return Which Combination of Crops to Plant? What are Optimum Irrigation Schedules? *Limited Irrigation = Restricted Water Supply by Irrigation System Capacity or Public Policy Klocke-

  4. Crops for Rotations Alfalfa Corn Grain Sorghum Soybean Wheat Sunflower Fallow Land Splits – Predetermined 100% 50% - 50% 75% - 25% 33% - 33% - 33% 50% - 25% - 25% 25% - 25% - 25% - 25% Klocke-

  5. Corn Relative Yield-Irrigation for Annual Precipitation of 305 mm – 610 mm Net Return = Yield * Price – Operating Costs Klocke-

  6. Initial Conditions Klocke-

  7. Options from Initial ConditionsAll Combinations of Crops & Irrigation Allocations Considered C = Corn S = Grain Sorghum Annual Gross Irrigation = 152 mm Annual Precipitation = 406 Options Ranked According to Net Return Klocke-

  8. Results from #1 Option for Each Irrigation Amount C = Corn S = Grain Sorghum Annual Precipitation = 406 mm Klocke-

  9. Net Return ($/ha) for Option #1Over Ranges of Crop Price Annual Gross Irrigation = 152 mm Annual Precipitation = 406 mm Klocke

  10. Variables for 2-Way Trend Analysis Commodity Price Production Costs Maximum Yield Precipitation Irrigation Costs Application Efficiency Klocke

  11. Risk for Net Return ($/ha) Over a Range of Annual Precipitation Annual Gross Irrigation = 152 mm Klocke-

  12. Forecasting Irrigation ScheduleBy Economic Return Pre-Growing Season Irrigation? Date of First Irrigation During the Growing Season? Irrigation Frequency? Irrigation System Capacity Mandated Annual Irrigation Predetermined Irrigation Schedule? Date of Last Irrigation During the Growing Season? Klocke-

  13. Kansas Water Budget Reference ET Soil Water Balance Maximum ET Available SW Actual ET Effective ET Yield Klocke

  14. Corn – Results for Available SW = 30%, 50%, 70% NGS = Non-Growing Season GS = Growing Season Annual Irrigation = 305 mm between May 20 & Aug 20 Annual Precipitation = 406 mm Klocke-

  15. Effectiveness of Pre-Season Irrigation Pre-season Irrigation on March 1, March 15, April 1 NGS = Non-Growing Season GS = Growing Season Annual Precipitation = 406 mm Klocke-

  16. Income Risk from 80%, 50%, 20%Rainfall Probabilities 30% ASW on October 1 NGS = Non-Growing Season GS = Growing Season Annual Irrigation = 305 mm between May 20 & Aug 20 Klocke-

  17. Summary User Acceptance – Computer Literate Producers Crop Consultants Water Policy Agencies Irrigation Specialists Educators Training Needs CWA – 1 hour CYP – 2 hour Klocke-

  18. Download CWA and CYP at:www.mobileirrigationlab.com Klocke, N.L., L.R. Stone, S. Briggeman, D.A. Bolton. 2010. Scheduling deficit irrigation—crop yield predictor. J. of App. Eng. in Agric. 26(3):413-418. Klocke, N.L., R.S. Currie, L.R. Stone, and D.A. Bolton. 2010. Planning for deficit irrigation. J. of App. Eng. In Agric. 26(3):405-412. Klocke, N.L., L. R. Stone, G. A. Clark, T. J. Dumler, S. Briggeman. 2006. Water allocation model for limited irrigation. J. of App. Eng. In Agric. 22:3:381-389. Klocke-

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