can cover increase the efficiency of fall applied n? cover...problem •in central illinois 48-52%...
TRANSCRIPT
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Can Cover Crops Improve the Efficiency of
Fall Applied Nitrogen within Conventional
Midwestern Cropping Systems?
Corey Lacey
M.S. Candidate In Agriculture Sciences
Dr. Shalamar Armstrong
Assistant Professor of Soil Science and Agronomy
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Our watersheds are
interconnected, therefore my N
management practices impacts
my neighbor
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Introduction
USGS reported that Agriculture contributes > 70%
of N deliver to the Gulf of Mexico annually
Corn and Soybean fields of the Midwest contribute
contributes ~50% of the N loading to the Gulf (USGS,
2007)
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• 73% increase in size since 1987
• 87% increase in size since 2000
(NOAA, 2011)
Growth of the Hypoxic Zone in the Gulf
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Implementation of BMPs and
Conservation to Decrease N losses
Lemke et al. 2011
• 7 years of BMP
implementation, no
significant difference in
NO3-N concentration in
surface water.
Surface Buffer strip
Flowing Tile
No Connection
No Impact
Sprague et al. 2011
estimated that the contribution of nitrate from the Illinois River to
the Gulf of Mexico had decreased by only 1% between the years
of 1998 and 2008.
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Implementation of BMPs and
Conservation to Decrease N losses
Manipulation of N rate
• several researchers have investigated the use of lower N fertilization rates to reduce nitrate leaching and found a direct relationship between N rates and nitrate losses via tile drainage, when the annual precipitation was normal.
• Other, studies have demonstrated that dry and wet climatic cycles more strongly influence N transport via tiles that application rate
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• N timing most effectively reduce Nitrate leaching from tile
drained fields.
Implementation of BMPs and
Conservation to Decrease N losses
Fall N with and
without N-inhibitor
30-43ppm NO3-N
Spring N with and
without N-inhibitor
23-29 ppm NO3-N
Control
15-23 ppm NO3-N
Smiciklas and Moore, 2008 – Bloomington Watershed
EPA Standard for Nitrates:10 ppm
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Spring Application of N + Cover Crops
Kasper et al., 2008, Iowa
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Problem
• In Central Illinois 48-52% of farmers fall apply N (Smiciklas and Moore, 2008, O’rourke, 2010)
• In Central Illinois only ~11% of farmers cover crop (Leopold Center, 2006)
Objectives
Therefore, our goals are to determine the efficacy of cover crops to improve the efficiency of fall applied N.
1. Investigate the effectiveness of three cover crop species to reduce nitrate leaching following fall applied N.
2. Determine impact of cover crop species on the release of stabilized fall N to the spring cash crop.
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Fall N Storage Using Cover Crops
N
N
N
Fall applied N
taken up by the
cover crop
In the spring, the
cover crop
decomposes and
releases N back
to the soil
The following
corn crop takes
up the release N
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Methodology • The experimental site was located at the Illinois State
University farm in Lexington, IL.
Lexington
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Methodology-Objective1
(Planting) Treatments:
• Corn-Corn – no cover crop Control
• Corn-Crimson Clover-Corn
• Corn-Cereal Rye-Corn
• Corn-Tillage Radish-Corn
*All treatments receive 200 kg ha-1 of fall applied N into a growing stand of cover crops
T.
Cover crops were drilled planted on September 8th, 2011,after harvesting corn
silage at the recommended seeding rates.
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• Fall N fertilizer application
was applied to standing
cover crops in November as
anhydrous ammonium (200
kg ha-1).
Methodology-N Fertilization Practices
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Method-Plant Sampling
• Plant samples were collected before the Tillage Radish plants winter killed.
• A second plant sampling was conducted in, before the termination of Cereal Rye and Crimson Clover. Only aboveground plant material was sampled.
• Plant samples were dried and analyzed for total N to determine N uptake.
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Terminated the cover crops in March
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• Spring soil samples were collected in April from each plot at
4 depths: 0-5cm, 5-20cm, 20-50cm and 50-80cm.
• Soil samples were analyzed for Nitrate Nitrogen (NO3-N)
Methods-Spring Soil Sampling
Soil Profile Depth 0-80cm
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After spring plowing corn was
planted on April 23, 2012 and
May 15, 2013
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Harvested corn for silage on August 12th 2012.
Methods-Corn Silage
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0
2
4
6
8
10
12
Jan
-11
Feb
-11
Mar
-11
Ap
r-1
1
May
-11
Jun
-11
Jul-
11
Au
g-1
1
Sep
-11
Oct
-11
No
v-1
1
De
c-1
1
Jan
-12
Feb
-12
Mar
-12
Ap
r-1
2
May
-12
Jun
-12
Jul-
12
Au
g-1
2
Sep
-12
Oct
-12
No
v-1
2
De
c-1
2
Jan
-13
Feb
-13
Mar
-13
Ap
r-1
3
May
-13
Jun
-13
Pre
cip
itat
ion
(In
che
s)
Year 1
21.3 inches
Year 2
31.9 inches
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Results- Year1
(2011/2012
Objective 1: Investigate the effectiveness of three cover crop
species to reduce nitrate leaching following fall applied N.
A
A
B
0
50
100
150
200
250
300
Nit
roge
n U
pta
ke (
kg/h
a)
Cover Crop Nitrogen Uptake
Cereal Rye
Tillage Radish
Crimson Clover
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Results-Year 2
2012/2013
C 3.82
B 131.94
A 249.92
0.00
50.00
100.00
150.00
200.00
250.00
300.00
N u
pta
ke (
kg N
/ h
a)
Cover Crop N Uptake 2012/2013
Clover
Radish
Rye
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2 Average
0
50
100
150
200
250
N U
pta
ke (
kg/h
a)
Cover Crop N uptake 2 year Average
Clover
Tillage Radish
Cereal Rye
A
A
B
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Results- Year 1- 2011/2012
AB
A
A
B
C
B
BC
B
0
10
20
30
40
50
60
70
80
90
0 50 100 150So
il D
ep
th (
cm)
Soil NO3-N (kg/ha)
Control Tillage Radish
Crimson Clover Cereal Rye
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0
10
20
30
40
50
60
70
80
90
0 20 40 60 80
Soil
De
pth
(cm
) Soil NO3-N (kg/ha)
Control Cereal Rye Tillage Radish Crimson Clover
A
A
A
AB
AB
AB
BC
AB
B AB
C
B
Results- Year 2- 2012/2013
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Cover Crop vs. Control
Results- Year 2 Average
0
10
20
30
40
50
60
70
80
90
0 10 20 30 40 50 60 70 80 90
Soil
De
pth
(cm
)
Soil NO3-N (kg ha-1)
Control
Cover Crop
A B
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Specific Year 2 Averaged
0
10
20
30
40
50
60
70
80
90
0 50 100
Soil
De
pth
(cm
) Soil NO3-N (kg/ha)
Control Cereal Rye Tillage Radish Crimson Clover
A AB ABC C
A AB B C
A B
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Cover Crop Impact of Nitrate Distribution
(2 year Average)
Control Cover Crop
0-20 cm
20-50 cm
50-80 cm
18%
35%
47%
30%
29%
33%
% S
oil
Nitra
te a
t 0
-80 c
m d
epth
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Cover Crop Impact of Nitrate Distribution
(2 year Average)
Control Tillage Radish Cereal Rye Crimson Clover
0-20 cm
20-50 cm
50-80cm
28%
32%
40%
45%
24%
31%
33%
41%
27% 34%
29%
34%
% S
oil
Nit
rate
at
0-8
0 c
m d
epth
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Method-Objective 2
• Soil samples were collected immediately before cover
crop termination and in weekly increments until 1 week
after the planting date of corn.
• Soil samples were analyzed for NO3-N.
Determine impact of cover crop species on the
release of stabilized fall N to the spring cash
crop.
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Results-Year 1
2011/2012
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Results-Year 2
2012/2013
0
20
40
60
80
100
120
-5 5 15 25 35
Soil
NO
3-N
(kg
ha-1
)
Days After Cover Crop Termination
Control
Tillage Radish
Cereal Rye
Crimson Clover
Cover Crop Termination
Spring Tillage
Planting 5/7/13
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Nitrogen Released at Planting
0
20
40
60
80
100
120
Control Tillage Radish C. Rye C. Clover
% o
f Fa
ll ap
plie
d N
as
Soil
Nit
rati
on
in
the
0-2
0cm
De
pth
Year 1
Year 2
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Results- Year 1- 2011/2012
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What did we learn? Objective 1
• Tillage Radish and Cereal Rye were the only cover crops species that were able to absorbed the full rate of fall applied N.
• Fall application of N into a standing cover crop significantly reduces nitrate leaching. Cereal Rye>Tillage Radish>Crimson Clover
• Cover crops had no impact on corn silage production in the 2011/2012 growing season.
Objective 2
• Tillage Radish releases more fall applied N at planting relative Cereal Rye and Crimson clover.
• Extreme climatic conditions effect rate by which cover crops release fall applied N in the spring.
• The inclusion of Cover Crops into conventional cropping systems has the potential to increase the efficiency of fall applied N.