Keys to Cover Crop Success
Three simple ideas can help you chose practices that lead to success:
- Fast Start
- No Gaps
- Kill on Time
Fast start
The cover crop must emerge and grow faster than the weeds.
- Warm soil, not borderline for the species
- Enough moisture in the seed zone
- Excellent seed-soil contact
- As shallow as possible to meet requirements above
Legumes are slow; they need a fast nurse crop
No Gaps
Weeds will grow in even small gaps in the cover crop stand
- All of the field can make a good seedbed
- Use a drill or grass seeder to control distribution
- If broadcasting, cover field twice at different angles
- Meet Fast Start requirement in the whole field
Kill on time
Terminate when plants will kill completely
Early flowering is often best
In spring, just after green-up allows less tillage and faster soil warming
Terminate so before there is a risk of seed production
Chose an effective method for the species, growth stage and season.
- Mow all growing points
- Separate roots and shoots with shallow tillage
- Herbicide while still susceptible
- Winter kills sensitive tissues
(bulbs and stems are sensitive, rosettes are hardy) - Roll crimp (only before soybeans).