Nesson Valley Potato Project Irrigation Water Management

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Nesson Valley Potato Project-- Irrigation Water
Management

• Jim Staricka
• Williston Research Extension Center
• Dean Steele
• Ag. Biosystems Engineering Department

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Irrigation Water Management

• Objectives
• Measurements
• Results

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Objectives

• Provide feedback on irrigation water management
• Collect data sets for post-season analysis

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Measurements

• Weather Data
• Soil Moisture
• Canopy Measurements

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Weather Data

• Temperature, Humidity, Solar Radiation, Rain,
  Wind
• Used for Irrigation Scheduling During the Season
• Used for Crop Modeling After the Season

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Soil Moisture Measurements

• Used During the Season to Monitor Irrigation
  Scheduling
• Used After the Season to Determine Accuracy of
  Irrigation Scheduling

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Soil Moisture Measurements

• Volumetric Water Content
• Soil Water Potential

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Water Balance Calculation

• Inflow - Outflow Change in Storage
• (R I) - (ET DP) (S2 - S1)
• ET (R I) - DP - (S2 - S1)

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Example ET Calculation

• ET (R I) - DP - (S2 - S1)
• (0.47) - (0) - (4.25-4.45)
• 0.67 for July 17-20, 1998
• 0.22/day average at Pluto1

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Results

• Weather Data
• Soil Moisture Measurements

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1998 ET for Williston
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Summary

• Similar measurements in 1999.
• Irrigation scheduling must involve field
  measurements.
• Soil variability must be considered.
• Thank you for the support.

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