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The Value of Cover Crops 
2014 and beyond 
Joel Gruver 
WIU Agriculture 
J-gruver@wiu.edu
Ever seen anything like this?
Champaign Cty, IL
How about this?
This is not your grandfather’s 
CC planting equipment! 
Sciota, IL
1922
Unprecedented farmer interest 
has been a key driver of the 
cover crop revolution
1 week
Farmer to farmer communication about 
CCs facilitated by the internet and digital 
cameras has stoked the fire
2012 – SARE Survey 
Results
Seed vendors have have played a key 
role in the CC revolution
How much is 
good 
technical 
support 
worth to 
farmers?
http://www.greencoverseed.com/
Cover crop FAQ on FARMWEEKNOW.COM 
Q. Which cover crops collect/remove nitrogen (N) the quickest or most efficiently? 
Q: How do I determine which cover crops are best suited for my soils and typography? 
Q. What is the carbon-nitrogen penalty, meaning how many units of carbon to how 
many units of nitrogen? How do I account for that? 
Q. I am just starting to grow cover crops. Which ones are easier to start with? Which 
ones should I stay away from? 
Q. Can I plant cover crops on fields in continuous corn? 
Q: Which cover crops are better for weed control? 
Q. We’ve had trouble getting a good stand of cover crops the last two years. Last year, 
we planted cereal rye and radishes on the corn ground going into soybeans. We 
planted cereal rye, radish and crimson clover with a plane on ground going into corn. 
Our fields are in northeast St. Clair County. 
Q. A Monmouth farmer asks, “Is there a better product and/or faster working product 
than what I’m doing if the rye has any size to it? Burndown of annual rye is frustrating 
and slow. I was told to always use Roundup 32-44 oz., 1 pt. 24-D, A.M.S. on the first 
trip. Then the second trip put down my residual. Sometimes with the wet and busy 
spring, it is tough to fit in. I want to keep a cover crop on in the winter.” 
Q: When cover crops decompose, what amounts of nitrogen do they contribute back 
into the soil? 
Q: What should I consider about reliability of cover crop seed sources? What about 
seed mixes?
Each Q is answered by multiple IL CC specialists
No chapter on cover crop economics !
+30
~200 profiles since 2008
What role should 
CCAs play in 
cover crop 
decision making?
Well… what do you 
want your cover 
crop to do for you?
Where are the best places for 
cover crops on your farm? 
When is the best time for 
establishment and termination? 
What needs to be adjusted 
to find the best fit?
Are you familiar with the term 
Precision Conservation?
CCs affect many agronomic factors 
simultaneously 
Cover 
Crops 
Adapted from Magdoff and Weil (2004) 
Feed 
livestock 
Control 
erosion
Not all effects are positive 
? ? 
Host 
pests 
Increase 
management 
Become a 
weed 
Prevent 
soil drying 
Interfere w/ 
equipment 
performance 
Dry out soil 
excessively 
Suppress crop 
growth 
Tie up N 
Add cost 
Cover 
Crops 
Adapted from Magdoff and Weil (2004)
Can you think of any ag 
technologies that substitute 
for management skill?
Wow...cover crops 
are not idiot-proof! 
Cover crops require and reward management 
more than broadly adapted technologies
Miguez, F.E. and G.A. Bollero. 2005. Review of corn yield 
response under winter cover cropping systems using meta-analytic 
methods. Crop Science. 45:2318-2329.
Carlson, S. 2013. Winter rye cover crop effect on grain crop 
yields: Year 4. Practical Farmers of Iowa. Ames, Iowa.
#1 way to make 
cover crops pay!!!
EQIP CSP
DIRECT COSTS OF CC 
Material costs 
•seed 
•inoculant 
•herbicide 
•fertilizer 
Operational costs 
•establishing 
•terminating 
•managing residues
+20 lbs N/a
Preceded by 
spring planted radish
Per acre costs of cover crop planting operations 
based on custom rate surveys 
Field operation IA* IL IN* MO* 
Fertilizer buggy 4.15 (1.50- 
7.50) 
4.72 (3.07-6.37) 4.97 (3-15) fert 
6.02 (3.50-15) 
fert+seed 
Harrowing 8.10 (4- 
12.50) 
6.78 (3-12) 
Cultipacking 6.55 (3-10) 8.50 (5-15) 
Broadcast w/ ATV 10.35 (8-12) 7.44 (3-12.50) 
Conv. grain drill 13 (7.50-20) 11.40 15.89 (13.63- 
18.15) s 
13 (8-24) sg 
14.09 (10-24) gc 
No-Till grain drill 15.35 (12-25) 14.60 14.47 (10.80- 
18.14) 
14.80 (10-24) s 
14.25 (5-25) sg 
Air seeder 16.40
Examples of total cover crop management programs ($/ac) 
Costs Program 1 Program 2 Program 3 Program 4 
Seed 11.25 7.50 11.25 9.00 
Seeding operation 4.15 15.00 10.00 1 0 . 0 0 
Seed incorporation 6.50 
Herbicide 2.00 2.00 
Termination 
6.50 6.50 
operation 
Total 30.40 31.00 21.25 19.00 
Program 1 
Seed: 90 lbs/ac cereal rye 
Seeding operation: spread w/fertilizer buggy 
Seed incorporation: rolling stalk chopper 
Herbicide: 24 oz. glyphosate 
Termination operation: 90’ boom spray rig 
Program 3 
Seed: 90 lbs of cereal rye 
Seed bed preparation: none 
Seeding operation: aerial seeding 
Herbicide: no added cost, burn-down standard 
Termination operation: no added cost, burn-down standard 
Program 2 
Seed: 60 lbs/ac cereal rye 
Seed bed preparation: none 
Seeding operation: no-till drill 
Herbicide: 24 oz. glyphosate 
Termination operation: 90’ boom spray rig 
Program 4 
Seed: 3 bushels of bin-run oats 
Seed bed preparation: none 
Seeding operation: aerial seeding 
Herbicide: none – winter-kill 
Termination operation: none – winter-kill
IA and IL Aerial Applicator Survey (May-June 2010) 
Name Location Experience w/CC Cost 
Cady Aerial Spray Rock Falls, IL 
no exp., no customer 
interest $8.00/a norm app $8.50/a cc 
Benoit Aerial 
Spraying Kankakee, IL turnips and rye $8.00/a norm app $10.00/a cc 
Franks Flying 
Service Morrison, IL ryegrass and c. rye $8.00/a norm app $10.00/a cc 
Reeds Fly-on 
Farming Mattoon, IL 
yes, c. rye, small part 
of business $8.00/a norm app $12.00/a cc 
Killiam Flying 
Service Carlinville, IL 
rye, wheat on beans, 
rye on corn 
$8.00/a norm app $10.00/ac 
or 10/lb 
Curless Flying 
Service Astoria, IL ryegrass and turnips $8-15.00/a all app. 
Klein Flying 
St. Francisville, 
Service 
IL annual rye and turnips 
~$12.50/a cc, $9.00/a liquid 
app 
Agriflite Services Wakarusa, IN rye, wheat, ryegrass ave $15.00/a for cc app. 
Al's Aerial 
Spraying Ovid, MI rye and wheat 
$10-15.00/a cc $10.00/a 
liquid
IL CC Business Directory
?
Opportunities for planting cover crops 
• Dormant seeding early or late winter 
• Frost seeding 
• In the spring 
• When planting summer crops 
• Prevent plant scenarios 
• Before canopy closure 
• After small grains 
• After vegetables 
• After seed corn or silage corn 
• Aerial or high clearance seeding into standing crops in late 
summer/early fall as canopy opens 
• After early corn/bean grain harvest 
• After full season corn/bean grain harvest
PSU 
interseeder 
crimson 
clover and 
annual 
ryegrass are 
very shade 
tolerant
West Union, IA
I run a delayed burn down..... Usually mid to late May. 
I have switched back to older chems..... I miss the Callisto, we’re supposed to 
only get a few weeks residual, but 2yrs ago I seeded some clover every week til 
August..... In August, still fried clover after emergence. With that said, I did 
have a bunch of clover pop the next spring, just doubt I got much benefit from 
it..... Since it showed up about the week I sprayed.
This is how you begin!
Corvus Atrazine 
WIU student 
Flexstar 
project 
Lexar Halex
Ghosts of cover crops past: quantifying the effects of 
cover crops on subsequent crop-weed-soil interactions 
http://agroecologyunh.blogspot.com/2013/08/student-research-using-phytometer-to.html
With hairy vetch, a rule of thumb is to cut a 
4-foot-by-4-foot area and weigh it. Then 
multiply the weight by 25 to calculate total 
nitrogen produced. Figure half of that is 
available to crop in next 60 days. If the vetch is 
tilled into soil, more nitrogen is available sooner.
Cover crops should not be viewed as the missing 
puzzle piece(s) in current cropping systems!
Perennial-based 
crop rotations 
Winter cover crops 
Permanent pasture systems Perennial bio-energy crops
RYE
…while also 
improving soil 
health
Same soil type 
and landscape position 
Crop Fence row 
Students in my Soil Properties class just finished 
analyzing paired soils from their farms
< -- Spring 
WIU Organic Research farm 
Next fall --> 
Some things 
are priceless 
Student’s 
home farm

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Value of Cover Crops

  • 1. The Value of Cover Crops 2014 and beyond Joel Gruver WIU Agriculture J-gruver@wiu.edu
  • 2. Ever seen anything like this?
  • 5. This is not your grandfather’s CC planting equipment! Sciota, IL
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. Unprecedented farmer interest has been a key driver of the cover crop revolution
  • 13. Farmer to farmer communication about CCs facilitated by the internet and digital cameras has stoked the fire
  • 14. 2012 – SARE Survey Results
  • 15.
  • 16. Seed vendors have have played a key role in the CC revolution
  • 17. How much is good technical support worth to farmers?
  • 19.
  • 20.
  • 21. Cover crop FAQ on FARMWEEKNOW.COM Q. Which cover crops collect/remove nitrogen (N) the quickest or most efficiently? Q: How do I determine which cover crops are best suited for my soils and typography? Q. What is the carbon-nitrogen penalty, meaning how many units of carbon to how many units of nitrogen? How do I account for that? Q. I am just starting to grow cover crops. Which ones are easier to start with? Which ones should I stay away from? Q. Can I plant cover crops on fields in continuous corn? Q: Which cover crops are better for weed control? Q. We’ve had trouble getting a good stand of cover crops the last two years. Last year, we planted cereal rye and radishes on the corn ground going into soybeans. We planted cereal rye, radish and crimson clover with a plane on ground going into corn. Our fields are in northeast St. Clair County. Q. A Monmouth farmer asks, “Is there a better product and/or faster working product than what I’m doing if the rye has any size to it? Burndown of annual rye is frustrating and slow. I was told to always use Roundup 32-44 oz., 1 pt. 24-D, A.M.S. on the first trip. Then the second trip put down my residual. Sometimes with the wet and busy spring, it is tough to fit in. I want to keep a cover crop on in the winter.” Q: When cover crops decompose, what amounts of nitrogen do they contribute back into the soil? Q: What should I consider about reliability of cover crop seed sources? What about seed mixes?
  • 22. Each Q is answered by multiple IL CC specialists
  • 23.
  • 24. No chapter on cover crop economics !
  • 25. +30
  • 26.
  • 28.
  • 29.
  • 30.
  • 31. What role should CCAs play in cover crop decision making?
  • 32. Well… what do you want your cover crop to do for you?
  • 33. Where are the best places for cover crops on your farm? When is the best time for establishment and termination? What needs to be adjusted to find the best fit?
  • 34. Are you familiar with the term Precision Conservation?
  • 35. CCs affect many agronomic factors simultaneously Cover Crops Adapted from Magdoff and Weil (2004) Feed livestock Control erosion
  • 36. Not all effects are positive ? ? Host pests Increase management Become a weed Prevent soil drying Interfere w/ equipment performance Dry out soil excessively Suppress crop growth Tie up N Add cost Cover Crops Adapted from Magdoff and Weil (2004)
  • 37. Can you think of any ag technologies that substitute for management skill?
  • 38. Wow...cover crops are not idiot-proof! Cover crops require and reward management more than broadly adapted technologies
  • 39.
  • 40. Miguez, F.E. and G.A. Bollero. 2005. Review of corn yield response under winter cover cropping systems using meta-analytic methods. Crop Science. 45:2318-2329.
  • 41. Carlson, S. 2013. Winter rye cover crop effect on grain crop yields: Year 4. Practical Farmers of Iowa. Ames, Iowa.
  • 42. #1 way to make cover crops pay!!!
  • 44. DIRECT COSTS OF CC Material costs •seed •inoculant •herbicide •fertilizer Operational costs •establishing •terminating •managing residues
  • 46. Preceded by spring planted radish
  • 47. Per acre costs of cover crop planting operations based on custom rate surveys Field operation IA* IL IN* MO* Fertilizer buggy 4.15 (1.50- 7.50) 4.72 (3.07-6.37) 4.97 (3-15) fert 6.02 (3.50-15) fert+seed Harrowing 8.10 (4- 12.50) 6.78 (3-12) Cultipacking 6.55 (3-10) 8.50 (5-15) Broadcast w/ ATV 10.35 (8-12) 7.44 (3-12.50) Conv. grain drill 13 (7.50-20) 11.40 15.89 (13.63- 18.15) s 13 (8-24) sg 14.09 (10-24) gc No-Till grain drill 15.35 (12-25) 14.60 14.47 (10.80- 18.14) 14.80 (10-24) s 14.25 (5-25) sg Air seeder 16.40
  • 48. Examples of total cover crop management programs ($/ac) Costs Program 1 Program 2 Program 3 Program 4 Seed 11.25 7.50 11.25 9.00 Seeding operation 4.15 15.00 10.00 1 0 . 0 0 Seed incorporation 6.50 Herbicide 2.00 2.00 Termination 6.50 6.50 operation Total 30.40 31.00 21.25 19.00 Program 1 Seed: 90 lbs/ac cereal rye Seeding operation: spread w/fertilizer buggy Seed incorporation: rolling stalk chopper Herbicide: 24 oz. glyphosate Termination operation: 90’ boom spray rig Program 3 Seed: 90 lbs of cereal rye Seed bed preparation: none Seeding operation: aerial seeding Herbicide: no added cost, burn-down standard Termination operation: no added cost, burn-down standard Program 2 Seed: 60 lbs/ac cereal rye Seed bed preparation: none Seeding operation: no-till drill Herbicide: 24 oz. glyphosate Termination operation: 90’ boom spray rig Program 4 Seed: 3 bushels of bin-run oats Seed bed preparation: none Seeding operation: aerial seeding Herbicide: none – winter-kill Termination operation: none – winter-kill
  • 49. IA and IL Aerial Applicator Survey (May-June 2010) Name Location Experience w/CC Cost Cady Aerial Spray Rock Falls, IL no exp., no customer interest $8.00/a norm app $8.50/a cc Benoit Aerial Spraying Kankakee, IL turnips and rye $8.00/a norm app $10.00/a cc Franks Flying Service Morrison, IL ryegrass and c. rye $8.00/a norm app $10.00/a cc Reeds Fly-on Farming Mattoon, IL yes, c. rye, small part of business $8.00/a norm app $12.00/a cc Killiam Flying Service Carlinville, IL rye, wheat on beans, rye on corn $8.00/a norm app $10.00/ac or 10/lb Curless Flying Service Astoria, IL ryegrass and turnips $8-15.00/a all app. Klein Flying St. Francisville, Service IL annual rye and turnips ~$12.50/a cc, $9.00/a liquid app Agriflite Services Wakarusa, IN rye, wheat, ryegrass ave $15.00/a for cc app. Al's Aerial Spraying Ovid, MI rye and wheat $10-15.00/a cc $10.00/a liquid
  • 50. IL CC Business Directory
  • 51. ?
  • 52. Opportunities for planting cover crops • Dormant seeding early or late winter • Frost seeding • In the spring • When planting summer crops • Prevent plant scenarios • Before canopy closure • After small grains • After vegetables • After seed corn or silage corn • Aerial or high clearance seeding into standing crops in late summer/early fall as canopy opens • After early corn/bean grain harvest • After full season corn/bean grain harvest
  • 53.
  • 54. PSU interseeder crimson clover and annual ryegrass are very shade tolerant
  • 56.
  • 57. I run a delayed burn down..... Usually mid to late May. I have switched back to older chems..... I miss the Callisto, we’re supposed to only get a few weeks residual, but 2yrs ago I seeded some clover every week til August..... In August, still fried clover after emergence. With that said, I did have a bunch of clover pop the next spring, just doubt I got much benefit from it..... Since it showed up about the week I sprayed.
  • 58. This is how you begin!
  • 59.
  • 60. Corvus Atrazine WIU student Flexstar project Lexar Halex
  • 61.
  • 62.
  • 63. Ghosts of cover crops past: quantifying the effects of cover crops on subsequent crop-weed-soil interactions http://agroecologyunh.blogspot.com/2013/08/student-research-using-phytometer-to.html
  • 64.
  • 65. With hairy vetch, a rule of thumb is to cut a 4-foot-by-4-foot area and weigh it. Then multiply the weight by 25 to calculate total nitrogen produced. Figure half of that is available to crop in next 60 days. If the vetch is tilled into soil, more nitrogen is available sooner.
  • 66.
  • 67.
  • 68.
  • 69. Cover crops should not be viewed as the missing puzzle piece(s) in current cropping systems!
  • 70. Perennial-based crop rotations Winter cover crops Permanent pasture systems Perennial bio-energy crops
  • 71. RYE
  • 72.
  • 73. …while also improving soil health
  • 74. Same soil type and landscape position Crop Fence row Students in my Soil Properties class just finished analyzing paired soils from their farms
  • 75.
  • 76. < -- Spring WIU Organic Research farm Next fall --> Some things are priceless Student’s home farm