Im Impac pact t of of V Variable R Rate I Irrigation on on - - PowerPoint PPT Presentation

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Im Impac pact t of of V Variable R Rate I Irrigation on on - - PowerPoint PPT Presentation

Dec 07, 2022 49 likes •111 views

Im Impac pact t of of V Variable R Rate I Irrigation on on on Co Consu sump mptive Use se of f Water r Reso sources Derek M. Heeren, Ph.D., P.E. UNL Department of Biological Systems Engineering Co-PIs: Daran Rudnick,

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SLIDE 1

Im Impac pact t of

  • f V

Variable R Rate I Irrigation

  • n on
  • n

Co Consu sump mptive Use se of f Water r Reso sources

  • Derek M. Heeren, Ph.D., P.E.
  • UNL Department of Biological Systems Engineering
  • Co-PIs: Daran Rudnick, Ph.D., and Francisco Munoz-Arriola, Ph.D.
  • Collaborator: J. Burdette Barker, Ph.D.
  • USGS 104(b) funding amount: $20,000
  • Duration: June 2017 to May 2018

August 29, 2017 Nebraska Water Center (NWC) Advisory Board

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SLIDE 2

Ob Objectives

  • Quantify impact of VRI on consumptive use of water resources
  • Continue a field-scale evaluation of VRI
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SLIDE 3

Ta Tasks Undertaken

  • Hired M.S. student (Sandeep Bhatti)
  • Hired undergraduate research assistant (Isabella Possignolo)
  • Interview of students: https://www.youtube.com/watch?v=uMLyZaUhlYI&t=58s
  • Two field sites
  • ARDC, Mead, southeastern Nebraska, corn and soybeans
  • BWL, Brule, western Nebraska, corn
  • Irrigation treatments
  • Conventional irrigation
  • Variable rate irrigation (VRI)
  • Monitoring soil water, crop physiology, etc.
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SLIDE 4

Pr Principal Findings

  • Will calculate consumptive use after the growing season
  • Compare conventional irrigation to VRI
  • Cumulative irrigation to date (preliminary data for 2017):
  • Good VRI management requires much effort
  • Clouds problematic for satellite data à transitioning to unmanned

aircraft

Mead Corn Mead Soybean Brule Corn Conventional Irrigation (in) 3.0 2.0 8.3 VRI (in) 3.2 3.0 8.5

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SLIDE 5

Si Significance/Imp mpact

  • Supported a 3rd year to strengthen field trial results
  • VRI not expected to reduce consumptive use
  • The benefits of VRI are likely being overestimated
  • Reduced pumping does not necessarily result in more water available for

downstream users

  • Key output: Extension publication on the benefits of VRI
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SLIDE 6

Futur Future e Funding Funding Plans Plans

  • Nebraska Natural Resources Commission (NRC) Water Sustainability

Fund

  • 2018 summer: Submit proposal
  • 2017 season will provide preliminary data
  • Recent USDA AFRI funding enhances this research