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Drip Irrigation Research in Arkansas

Drip Irrigation Research in Arkansas. Earl Vories University of Arkansas Northeast Research & Extension Center Keiser, Arkansas. Center Pivot and Furrow Irrigation Common in the Mid-South. Blytheville. Leachville. Satellite Image of NE Ark. Aug., 99. Manila. Osceola.

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Drip Irrigation Research in Arkansas

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  1. Drip Irrigation Research in Arkansas Earl Vories University of Arkansas Northeast Research & Extension Center Keiser, Arkansas

  2. Center Pivot and Furrow Irrigation Common in the Mid-South

  3. Blytheville Leachville Satellite Image of NE Ark. Aug., 99 Manila Osceola

  4. Drip Irrigation Getting Interest • Earlier use in arid areas (AZ, west TX, Israel). • Efficient use of limited water. • Allows injection of fertilizers/other products in root zone. • More recently being investigated in humid areas (southeast, mid-south).

  5. Current research efforts in Arkansas using precise water control possible with drip irrigation to investigate irrigation scheduling, rather than investigating the optimal drip irrigated production system.

  6. Change in Water Use With Crop Age

  7. Computerized Irrigation Scheduler Distributed by University of Arkansas Cooperative Extension Service (www.uaex.edu)

  8. Computerized Irrigation Scheduler

  9. Computerized Irrigation Scheduler

  10. Reference Evapotranspiration (Etr)

  11. Crop Coefficient Function - Cotton

  12. Crop Coefficient Function - Corn

  13. As you would expect, many differences between the drip irrigation systems on a production-field scale and a small-plot research scale.

  14. Field Scale System Controls Small Plot

  15. Injector Pumps for Water Conditioners (generally required for groundwater) Fertilizers, Soil Conditioners, etc.

  16. Filter Bank for Groundwater Field Scale

  17. RPZ Valve and Screen for Municipal Water Small Plot

  18. Solenoids for Controlling Water Small Plot Field Scale

  19. Lateral Lines Feeding Individual Drip Lines Small Plot Field Scale

  20. Much of 2001 growing season spent installing and testing irrigation/control/monitoring systems, probably reducing potential responses.

  21. Estimated Soil Water Deficits - Corn No Irr. Irrigation System Began Operation 75% ET 125% ET

  22. Corn Yields (bu/acre) Yields not significantly affected by water treatments.

  23. Later season allowed more observations in cotton study, more treatment differences observed.

  24. Estimated Soil Water Deficits - Cotton Irrigation System Began Operation

  25. Watermark sensor

  26. Output from Watermark Sensors - Cotton

  27. Crop Response to Water No Irrigation 100% ET

  28. Physiological Cutout (NAWF=5, DAP)

  29. Mean Maturity (DAP)

  30. Seedcotton Yields (lb/acre) Yields not significantly affected by water treatments.

  31. Conclusions from 2001 • System/equipment functioning well. • Installation of drip tubing (subsoiling every row) in spring, as well as delays in planting and irrigating due to installation probably affected responses in initial season. • Drip irrigation system appears to provide desired water control for studying irrigation scheduling.

  32. Acknowledgment Research supported by Arkansas corn and cotton producers through checkoff programs.

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