SlideShare a Scribd company logo
DuPont Cellulosic Ethanol
Delivering an Advantaged Biomass Fuel
Stover Harvest Season
Harvest started September 26th
and ended December 7th
 72 day harvest season
 Extended season due to late corn
planting in Iowa
 Rain, drizzle and snow
 Experienced normal and extreme baling
conditions
2014 Stover Harvest - - - 60,000 acres
Corn Stover: Benefits and Limitations
Conservation Benefits:

Agronomic Limitations:

 Protect soil from erosion
 Maintain soil organic matter
 Cycle crop nutrients

 Interfere with crop establishment and
early growth
 Immobilize nitrogen & harbor crop
pathogens
 Necessitate tillage
Improved Field Condition at Planting

Spring Residue following Soybean
Faster Stand Establishment
2012
2013
Corn Yield Advantage with Stover Harvest
Stover Harvest Yield Advantage
(bu/acre)

15
On Average: 5.2 bu/acre corn yield advantage w/stover harvest
Win rate: Stover harvest increased corn yield in 93% of trials

10

5

0

-5

-10

2012
2013
DuPont Stover Harvest: Grower Value
$45
Results for 14 on-farm research trials
in Central Iowa in 2012 and 2013

$30

Analysis based on $4.30 corn; $15/ton
stover; $0.51 P2O5; and $0.38 K2O

$22
$32

$/Acre

$15

$0
$24
-$15

-$15

-$30
Fertilizer
Replacement

Stover
Income

Yield
Gain

Net
Profit
Convenience Factors
Eliminate stalk chopping
Remove fall tillage pass
Less aggressive tillage
No need for fall AMS
Enter field earlier in spring

40% of farmers in the DuPont
stover program reduced tillage
intensity in 2013 or reported they
were planning to do so in 2014
How Much Stover can be Harvested Sustainability?

Stover to Retain (tons/acre)

6
5

Prevent Soil Erosion
Maintain Soil Carbon

5.6

Stover @ 180 bu/acre grain

4.8

4

0.8 tons/acre

3.4

3
2

2.0 tons/acre

3.5

2.3

2.2

1
0.5

0.4

0
Moldboard
Plow

Conserv. /
No-Till

Moldboard
Plow

Conserv. /
No-Till

Source: Wilhelm et al. 2007. Corn Stover to Sustain Soil Organic Carbon Constrains Biomass Supply.
Agronomy Journal. 99:1665-1667.
Field-Specific Soil Health Assessment
Field Location
Soil Types

Soil Organic Matter
-

Weather
Management
Productivity

+
Copyright © 2012 DuPont. All rights reserved.
13
Stover Update

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Stover Update

  • 1.
  • 2. DuPont Cellulosic Ethanol Delivering an Advantaged Biomass Fuel
  • 3. Stover Harvest Season Harvest started September 26th and ended December 7th  72 day harvest season  Extended season due to late corn planting in Iowa  Rain, drizzle and snow  Experienced normal and extreme baling conditions
  • 4. 2014 Stover Harvest - - - 60,000 acres
  • 5. Corn Stover: Benefits and Limitations Conservation Benefits: Agronomic Limitations:  Protect soil from erosion  Maintain soil organic matter  Cycle crop nutrients  Interfere with crop establishment and early growth  Immobilize nitrogen & harbor crop pathogens  Necessitate tillage
  • 6. Improved Field Condition at Planting Spring Residue following Soybean
  • 8. Corn Yield Advantage with Stover Harvest Stover Harvest Yield Advantage (bu/acre) 15 On Average: 5.2 bu/acre corn yield advantage w/stover harvest Win rate: Stover harvest increased corn yield in 93% of trials 10 5 0 -5 -10 2012 2013
  • 9. DuPont Stover Harvest: Grower Value $45 Results for 14 on-farm research trials in Central Iowa in 2012 and 2013 $30 Analysis based on $4.30 corn; $15/ton stover; $0.51 P2O5; and $0.38 K2O $22 $32 $/Acre $15 $0 $24 -$15 -$15 -$30 Fertilizer Replacement Stover Income Yield Gain Net Profit
  • 10. Convenience Factors Eliminate stalk chopping Remove fall tillage pass Less aggressive tillage No need for fall AMS Enter field earlier in spring 40% of farmers in the DuPont stover program reduced tillage intensity in 2013 or reported they were planning to do so in 2014
  • 11. How Much Stover can be Harvested Sustainability? Stover to Retain (tons/acre) 6 5 Prevent Soil Erosion Maintain Soil Carbon 5.6 Stover @ 180 bu/acre grain 4.8 4 0.8 tons/acre 3.4 3 2 2.0 tons/acre 3.5 2.3 2.2 1 0.5 0.4 0 Moldboard Plow Conserv. / No-Till Moldboard Plow Conserv. / No-Till Source: Wilhelm et al. 2007. Corn Stover to Sustain Soil Organic Carbon Constrains Biomass Supply. Agronomy Journal. 99:1665-1667.
  • 12. Field-Specific Soil Health Assessment Field Location Soil Types Soil Organic Matter - Weather Management Productivity +
  • 13. Copyright © 2012 DuPont. All rights reserved. 13