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Irrigation Scheduling Objectives and Concepts

Irrigation Water Management Training. Irrigation Scheduling Objectives and Concepts. Irrigation Water Management. Applying Water:. According to crop needs * • In amounts that can be held in the soil and be available to crops

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Irrigation Scheduling Objectives and Concepts

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  1. Irrigation Water Management Training Irrigation Scheduling Objectives and Concepts

  2. Irrigation Water Management Applying Water: • According to crop needs* • In amounts that can be held in the soil and be available to crops • At rates consistent with the intake characteristics of the soil and the erosion hazard of the site • So that water quality is maintained or improved

  3. Irrigation Scheduling • A part of irrigation water management

  4. Three Keys to Good Irrigation • Good Distribution Uniformity (DU) • Good Timing* • Minimize Surface Runoff

  5. DU Distribution Uniformity

  6. DUlq Exercise • 1.7 inches 2.0 inches • 1.8 inches 2.1 inches • 1.9 inches 2.2 inches • 2.0 inches 2.3 inches • Given the 8 measurements above, what is the DUlq for this irrigation?

  7. Try to Determine what the Consultant Knows • A farmer has hired a consultant to schedule irrigations on his drip tape system. • The consultant tells the farmer to irrigate this week for 80 hours. • What does the consultant know?

  8. What is scheduling? • The decision of when and how much water to apply to a field • There are many methods available • It is not always an option (but remember that not to decide is to decide.)

  9. WILLARD " They told me that you had gone totally insane and that your methods were unsound." KURTZ " Are my methods unsound?" WILLARD " I don't see any method at all, sir."

  10. Water Balance Approach • Water used must be replaced • Any guesses why this is also called the checkbook method?

  11. Balance the soil water • Know how much water the soil can store • Know how much water the plant has used

  12. How much water can the soil hold? • Know the depth of the root zone • Know the water holding capacity of the root zone

  13. How much water has the crop used? • Know the actual crop evapo-transpiration

  14. When Do You Irrigate? • Know the Management Allowable Depletion (MAD)

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