Table 24. Bixby, Vegetable Research Station, Tulsa County
Irrigated, Sown 4 April 2006
Roundup Ready vs. Conventional
      2006
Variety Herbicide Treatment Combination 23-Jun 8-Aug 6-Oct Total
  Weed-free Tons DM/Acre
   
DKA41-18RR Roundup X2 12 0.81 1.05 1.53 3.39
DKA41-18RR Roundup X2 3 0.73 1.06 1.42 3.21
DKA41-18RR Beyond/Pursuit 7 0.45 0.79 1.13 2.37
OK 49 Select & 2,4-DB 10 0.40 0.67 1.18 2.25
DKA41-18RR Select & 2,4-DB 11 0.38 0.73 1.04 2.16
DKA41-18RR PP & 2,4-DB X2 5 0.52 0.58 1.02 2.12
OK 49 PP & 2,4-DB X2 4 0.44 0.69 0.98 2.11
OK 49 Beyond/Pursuit 6 0.37 0.75 0.85 1.96
DKA41-18RR None 1 0.42 0.48 0.27 1.16
DKA41-18RR None 9 0.23 0.39 0.26 0.88
OK 49 None 8 0.15 0.33 0.28 0.76
OK 49 None 2 0.15 0.40 0.20 0.74
   
Mean 0.42 0.66 0.85 1.92
5% LSD 0.23 0.14 0.19 0.44
CV (%)     37.5 15.2 16.0 16.0
   
OK 49 0.30 0.57 0.70 1.56
DKA41-18RR     0.51 0.73 0.95 2.18
Planted 4/5/2006            
Herbicide Date Herbicide Used Herbicide Rate Herbicide Additive Alfalfa Growth Stage Weed size Weed Density Trt. Sprayed
5/18/2006 Roundup  WeatherMax 44 oz/A AMS at  3 lbs/A 3-4 trifoliate 3 to 4" tall >5% 3
5/18/2006 Poast Plus & 2,4-DB 2 pt/A + 3 pt/A Crop Oil 1 qt/A 3-4 trifoliate 3 to 4" tall >5% 4 & 5
5/18/2006 Beyond 5 fl oz/A product AMS at  3 lbs/A 3-4 trifoliate 3 to 4" tall >5% 6 & 7
5/18/2006 Select & 2,4-DB 8 fl oz/A + 3 pt/A Crop Oil 1 qt/A 3-4 trifoliate 3 to 4" tall >5% 10 & 11
5/18/2006 Roundup  WeatherMax 44 oz/A AMS at  3 lbs/A 3-4 trifoliate 3 to 4" tall >5% 12
         
8/18/2006 Roundup  WeatherMax 44 oz/A AMS at  3 lbs/A 6 - 10" tall 10 - 12" tall 5 - 10% weeds 3
8/18/2006 Poast Plus & 2,4-DB 2 pt/A + 3 pt/A Crop Oil 1 qt/A 6 - 10" tall 10 - 12" tall 5 - 10% weeds 4 & 5
8/18/2006 Pursuit 1.44 oz/A product AMS at  3 lbs/A 6 - 10" tall 10 - 12" tall 5 - 10% weeds 6 & 7
8/18/2006 Select & 2,4-DB 8 fl oz/A + 3 pt/A Crop Oil 1 qt/A 6 - 10" tall 10 - 12" tall 5 - 10% weeds 10 & 11
8/18/2006 Roundup  WeatherMax 44 oz/A AMS at  3 lbs/A 6 - 10" tall 10 - 12" tall 5 - 10% weeds 12