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Sub-Surface Irrigated Corn

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					       Subsurface
       Drip Irrigation
       for Row Crops

Chad Lee
Extension Grain Crops
University of Kentucky
        Project SDI - Team
    Agronomy Agronomy     Agronomy
Investigators       Key Contributors
Biosystems & Agricultural Engineering
  Scott Shearer        Mike Peters
    Agronomy Agronomy BillAgronomy
  Chad Lee                 Peterson
  Greg Schwab          Steve Higgins
Biosystems & Agricultural Engineering
  Mike Collins         John Fulton
    Agronomy Agronomy     Agronomy
  Bob Pearce           Tracy Hamilton
Biosystems & Agricultural Engineering
  Mike Montross        James Dollarhide
    Agronomy Agronomy Rob Prewitt
  Dennis Hancock          Agronomy
                       BAE Engineers
Biosystems & Agricultural Engineering
  Subsurface Drip Irrigation
Advantages

Increased Efficiency
Ease of Use
Competitive Cost
  Especially for smaller
  acreage
  Low pressure
  Subsurface Drip Irrigation
Advantages          Disadvantages

Increased
Stationary Efficiency
Ease of Use
Difficult/Laborious
Installation Cost
Competitive
  Especially for smaller
  acreage
  Low pressure
        Tape Specifications

T-Tape (515-08-340)
  15 mil thick,
  4,100 ft/reel,
  8-10 psi
  8” spacing,
  0.340 gpm/100ft
Installation Specifications
Installation Specifications
Installation
Installation
Installation
Installation
Installation
                    Location

   University of Kentucky Animal Research Center,
    Woodford County
   About 300 acres of corn grown for livestock
   About 7.5 acres in SDI Study
   Maury silt loam soil
Crop Rotations
Corn, Continuous
Corn – Soybean
Corn – Tobacco
Tobacco – Corn
Alfalfa
                   SDI
    Installation and Plot Preparation

   Drip Tape Installed in April
   Installer was pulled through rainfed
    plots as well
   Field was disked 3 times
   Finished twice
   Will be no-till next year
      2003: SDI Questions
Alfalfa

  Will subsurface drip irrigation

•Improve establishment?

•Improve 2nd cutting yields?
      2003: SDI Questions
Alfalfa     Corn

  Will subsurface drip irrigation
 Will subsurface drip irrigation
•Improve establishment?
 •increase corn yields?

 •increase N cutting yields?
•Improve 2ndrequirements?
SDI in Alfalfa
               Just add water

   Approximately 4 inches of water was applied to
    alfalfa from July through August.

Month            Rain       Average        Diff.
               (inches)     (inches)     (inches)
June              4.21         4.0         +.21

July              4.64         4.8         -.16

August            4.21         3.7         +.51

Total            13.06        12.7
            2003: Alfalfa Results
   • Irrigated vs. Rainfed – (August 27, 2003)
      − Second Cutting of Establishment Year


                          Yield (tons/acre)
        Irrigated                  1.24
        Rainfed                    1.14
       Difference                  0.10*

* P=0.08
          2003: SDI in Corn

   Pioneer 31R88 (CRM 120)
   27,000 seeds/A
   5 gal of liquid 28%
   5 gal 10-34-0 Starter
    SDI in Corn: Weed Control
First Application (sprayed at V3)
Spirit                  1 oz/a
Basagran               1.5 pt/a
COC                    1 % v/v
28 % N                 1 qt/a
Second Application (spot sprayed at V5)
Exceed                 1 oz
Accent                 0.33 oz
COC                    1 qt/a
          Nitrogen Application
Sidedress N
(lbs N/acre)
     0
    40
    80
    120
    160
    200
    240
    280
    320
             Just add water

   Approximately 4 inches of water was
    applied to corn from V6 to VT
Month           Rain     Average      Diff.
              (inches)   (inches)   (inches)
June           4.21        4.0       +.21

July           4.64        4.8        -.16

August         4.21        3.7       +.51

Total          13.06      12.7
       Corn Yields
(Averaged Across N Rates)

 Water       Yield (Bu/A)

Irrigated        178

Rainfed          181

                  ns
          N Effect on Corn Yield


               250
                                             ab     ab     a     a    a
                                       b
               200
                              c
                         d
               150 d
Yield (bu/a)
               100

                50

                 0
                     0   40       80   120        160    200   240   280   320   360
                                           Sidedress N (lbs/A)
                     N Use Efficiency
                         (lbs N recovered / lbs N
                                 applied)
      3



      2

NUE

      1



      0
          0   50   100      150      200       250   300   350
                         Sidedress N (lbs/A)
          2003: SDI Lessons
Alfalfa

  •Establishment was improved
  based on improved yields of
  2nd cutting hay.
  •What will happen in a year
  that is dry?
           2003: SDI Lessons
 Alfalfa         Corn

    •Establishment was improved
  Corn yields were not increased in a year
    based on improved
  when water was adequate. yields of
    2nd cutting hay.
  If water was needed, it would have been
  before installation was complete.
                   happen acre year
     •What will 160 lbs N / in a was sufficient
Sidedress rate of
     that is yield
for maximum dry?in a wet year.
                2004 Plans

   No-Till (even tobacco)
   Corn (2nd year of continuous corn plots)
   Corn (following tobacco)
   Soybeans (following corn)
   Tobacco (following corn)
    Alfalfa Future Plans


•   Yield
•   K Fertility
•   Taproot Reserves
•   Remote Sensing
•   Yield Monitor for Forages
    Corn Future Plans


•   Yield
•   Nitrogen
•   Population
•   Hybrids
          SDI: Future Plans

After three of four years of research.

  • Economic analysis
  • Increasing yields is great, but we
    need to be able to pay for it!!
           SDI Website
http://www.bae.uky.edu/precag/sdi/




Chad Lee
859.257.3203
cdlee2@uky.edu

				
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posted:10/1/2012
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