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Irrigation Scheduling Concepts by taDcZbX


									     Irrigation Water
   Management Training

Irrigation Scheduling Objectives and
 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
      Irrigation Scheduling

• A part of irrigation water management
Three Keys to Good Irrigation

• Good Distribution Uniformity (DU)
• Good Timing*
• Minimize Surface Runoff
   DU Distribution Uniformity

        average low quarter depth of water accumulated
DU lq 
             average depth of water accumulated
         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
     Try to Determine what the
         Consultant Knows

• A farmer has hired a consultant to
  schedule irrigations on his drip tape
• The consultant tells the farmer to
  irrigate this week for 80 hours.
• What does the consultant know?
       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.)
WILLARD " They told me that you had gone
totally insane and that your methods were

   KURTZ " Are my methods unsound?"

WILLARD " I don't see any method at all, sir."
   Water Balance Approach

• Water used must be replaced
• Any guesses why this is also called
  the checkbook method?
    Balance the soil water

• Know how much water the soil can
• Know how much water the plant
  has used
 How much water can the soil

• Know the depth of the root zone
• Know the water holding capacity of
  the root zone
How much water has the crop

• Know the actual crop evapo-
    When Do You Irrigate?

• Know the Management Allowable
  Depletion (MAD)

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