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Herbicide Resistant Corn Hybrid Research in Georgia - 2001

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					 Herbicide Resistant
Corn Hybrid Research
  in Georgia - 2001
      Eric P. Prostko
    William K. Vencill
      R. Dewey Lee
Dept. Crop & Soil Sciences
  University of Georgia
                    Herbicide Resistant Crops - US
                      (Not Including Stacked Varieties)
                                     1999    2000     2001

               80


               60                                                      63
   Acres - %




                                                                  54
               40                                            48

                                       32
               20                            26      28

                      8    6     7
               0
                          Corn              Cotton            Soybeans
                                            Crop


Source: NASS/USDA
Research in 2001

             hybrid
             performance
              * Tifton (2 tests)
              * Athens


             application timing
             * Grady Co.
             * Seminole Co.
Research in 2001

             hybrid
             performance
              * Tifton
              * Athens


             application timing
             * Grady Co.
             * Seminole Co.
         Herbicide Resistant Corn Hybrid
         Performance - 2001
       240

       230
                                228     229
       220

       210
Bu/A




                                                 Treated
       200                                       Untreated
              198
       190           193
       180

       170
                Athens             Tifton
             (LSD 0.05 = NS)   (LSD 0.05 = NS)
         Roundup Ready Corn Hybrid
         Performance - 2001
       300

       250
                                  245    248
       200                                       217
             205    202                                P3163
Bu/A




       150                  173                        DK662-RR
                                                       G8349-RR
       100

       50

        0
                   Athens               Tifton
             (LSD 0.10 = 22)      (LSD 0.05 = 15)
              Roundup Ready Corn Hybrid
              Performance - 2001
        250
                  abc                                                        ab
                                       c-f         b-e                                bcd
        200    219                                                       225
                            ef                                 def                    207
                                               198
        150                        185                     178
                            169
 Bu/A




        100

        50

         0
              R




                                                                        87



                                                                                     97
                                   R



                                               R



                                                           R
                        G
             R




                                  R



                                              R



                                                          R
                     /Y




                                                                      K6



                                                                                   K6
           62




                                40



                                            38



                                                        26
                    R




                                                                     D



                                                                                  D
                   R
         K6




                              X7



                                          X7



                                                      X8
                 51
        D




                             R



                                         R



                                                     R
               K5
              D




                                              Hybrid
Ponder Farm
         Liberty Link Corn Hybrid
         Performance - 2001
       300

       250
                                   245         236
       200                                           221   P3163
             205             205
                                         190
Bu/A




                   182 185                                 P34B29-LL
       150
                                                           NK83Z8-LL
       100                                                 NKN79L3-LL

       50

        0
                   Athens                  Tifton
              (LSD 0.10 = 22)            (LSD 0.05 = 15)
         Clearfield Corn Hybrid
         Performance - 2001
       300

       250
                               245            245
       200                           226
             205    210 201                         P3163
Bu/A




       150                                          P34B28-CL
                                                    G8222-IT
       100

       50

        0
                   Athens            Tifton
             (LSD 0.10 = 22)    (LSD 0.05 = 15)
Research in 2001

             hybrid
             performance
              * Tifton
              * Athens


             application timing
             * Grady Co.
             * Seminole Co.
               Corn Yield Response to Liberty
               Application Timings, 2001.
            175
                   P = 0.10                                 a             a
            150                                             162          162
                                 abc            bc                                 abc                         bc
            125                                                                        139
                        c            126        122                                               c            120
            100                                                                                   111
     Bu/A




                    109

            75
            50
            25
             0
                   ed


                                AP


                                           AP


                                                      AP


                                                                    AP


                                                                                  AP


                                                                                             AP


                                                                                                          AP
                at


                            W


                                           W


                                                      W


                                                                  W


                                                                               W


                                                                                             W


                                                                                                        W
              re


                            1


                                       2


                                                  3


                                                                4


                                                                              5


                                                                                         6


                                                                                                      7
             nt
            U




                                                          Liberty Timing
Grady County - NK83-Z8
Liberty @ 28 ozs/A + AMS @ 3 lb/A
                  Corn Yield Response to Roundup
                  Ultra Application Timings, 2001.
            240
                    P = 0.10                                          a
            200
                                                          ab
                                 bcd           abc        195
                                                                     212
                                                                                   abc
                                               183                                                      bcd
            160         cd                                                         176
                                    163
                                                                                              d            159
     Bu/A




                    145
            120                                                                               131

            80

            40
             0
                   ed


                               AP


                                          AP


                                                     AP


                                                                AP


                                                                              AP


                                                                                         AP


                                                                                                      AP
                at


                             W


                                          W


                                                     W


                                                                W


                                                                           W


                                                                                         W


                                                                                                    W
              re


                         1


                                      2


                                                 3


                                                            4


                                                                          5


                                                                                     6


                                                                                                  7
             nt
            U




                                                Roundup Ultra Timing
Seminole County - DK622RR
Roundup Ultra @ 26 ozs/A + AMS @ 3 lb/A
    Summary
 Better hybrids are available.
 * DK 662RR
 * NK 83Z8LL
 * G8222-IT
 Apply Liberty @ 3-4 WAP
 Apply glyphosate @ 3-4 WAP
 Tank-mix with atrazine
  * Liberty ATZ or ReadyMaster ATZ
University of
  Georgia

                  Extension
                 Weed Science
                (gaweed.com)

				
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