Drill: 20-25 lbs/acre, 1/4 to 1/2 inch deep for best emergence
Broadcast: 25-30 lbs/acre, ground or aerial
Winterhawk can be planted at any time for cover cropping, depending on program needs and region. Cooler temperatures with adequate moisture are needed for establishment.
Winter Cover Crops: September/October in the South, August/September in the North
Spring Cover Crops: As soon as temperatures are high enough for germination...can be frost seeded...45 degree nights and 55 degree days will facilitate germination.
Carryover nutrients from the previous crop will be suitable for Winterhawk annual ryegrass. Ryegrass captures and holds these residual nutrients and will release them back into the soil as the organic material breaks down. Always take a soil sample and follow local recommendations.
1-1 1/2 quarts of glyphosate with a kicker and sticker during active annual ryegrass growth should give adequate control. Consult your local chemical dealer for specifics.
Mowing, incorporation, and repeated tillage will also control annual ryegrass. Do not allow to go to seed. Crop rotations with small grains is not advised.
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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