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
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
+