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Cover Crops

Winterhawk

Common Name
Annual Ryegrass

Winterhawk was developed by Dr. Gordon Prine of the University of Florida. Subjected to many cycles of selection for winter hardiness and frost tolerance in Nebraska, Winterhawk is the premier winter hardy annual ryegrass. Fast establishment, deep roots, high dry matter yields, and quick spring burn-down makes Winterhawk the ideal variety for cover crops. 

Benefits

  • Increases corn yields
  • Increases soybean yields 
  • Helps hold moisture
  • Suppresses weeds
  • Captures residual nitrogen
  • Increases organic material 
  • Prevents soil erosion 
  • Increases infiltration rates 

Details

  • Drill:            20-25 lbs/acre, 1/4 to 1/2 inch deep for best emergence 

    Broadcast:  25-30 lbs/acre, ground or aerial

Trials

  • Scottsbluff, NE 2003-2004

    Cold damage / Survival %
    Winterhawk 4.0 / 94.4
    Marshall 4.0 / 77.4
    Surrey II 3.4 / 45.0
    Brigadier 3.2 / 69.2
    Gulf 3.0 / 61.0
  • Scottsbluff, NE 2005-2006

    Survival %
    Winterhawk 95
    Marshall 51
    Surrey II 33
    Brigadier 26
    Gulf 14
  • Annual Ryegrass Trial

    South Charleston, OH planted 9/15/13

    Tons, DM, Acre / Winter injury
    Winterhawk 0.22 / 2.02
    Marshall 0.23 / 2.32
    Fria 0.25 / 2.79
    Assist 0.14 / 3.54
    Frosty 0.37 / 4.75
    Passerel Plus 0.42 / 5.00

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