tracy blackmer peter kyveryga
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Developing Infrastructure for Implementing Adaptive Management Practices for Corn on a Large Scale in
Iowa
Tracy BlackmerPeter Kyveryga
www.isafarmnet.comAdvancing Agricultural Performance® Iowa Soybean Association
On-Farm Network®
Precision Ag Tools
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.
The high price of nitrogen fertilizer/grain combined with the complexity of N dynamics makes it desirable to improve N management.
2008 Aerial Image
Precision Ag Tools
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2008 Aerial Image
Precision Ag Tools
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Started as a variable rate project to identify areas needing more or less N.
The results were such that improvements are needed at a whole field level before we target a subfield level.
Precision Ag Tools
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Precision ag tools help collect an unprecedented amount of data.
Replicated Strip Trials
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Replicated strip trial example.
N-50 refers to “normal” rate and 50 lbs N/a less.
Replicated Strip Trial Report
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Replicated strip trial example.
Page 1 Aerial image
Replicated Strip Trial Report
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Replicated strip trial example.
Page 2 Grain yield map
Replicated Strip Trial Report
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Replicated strip trial example.
Page 3 Treatment position map
Replicated Strip Trial Report
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Replicated strip trial example.
Page 4 Summary statistics
Fertilizer N Grain Yield
--------lb N/acre-------- -----------------bu/acre-------------------2001 C-SB 80 130 176.8 175.6 -1.2
2002 C-SB 70 120 192.5 195.4 2.9
2003 C-C 130 180 166.6 166.2 -0.4
2004 C-SB 60 110 199.7 206.1 6.4C-C 110 160 172.0 178.3 6.3
2005 C-SB 60 110 191.8 197.6 5.8C-C 110 160 182.1 193.9 11.9
2006C-C 120 150 188.4 192.5 4.12007 C-C 125 150 177.1 182.1 5.0
Year Rotation Low Rate High Rate Low Rate High Rate Diff.
Case Study: Grower Evaluation
Additional Analysis
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Yield increase from an additional 50 lbs N/a as affected by rainfall
Rainfall has a big impact on N management.
This should be factored into the evaluations. y=-6.02+1.22 x,
r2=0.52
Cummulative spring rainfall, in
7 8 9 10 11 12 13 14 15
Yie
ld d
iffer
ence
, bu/
acre
0
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4
6
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14
02
05
00
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07
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Nitrogen Evaluations
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# Guided Stalk Sampling# Replicated Strip Trials# Scouting Network# Watershed Programming
Over 1,000 guided stalk sample fields.
Over 150 N replicated strip trials.
End of Season Stalk Nitrate Test
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Stalk samples collected from 6-14 inches above ground after physiological maturity.
End of Season Stalk Nitrate Test
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Stalk samples collected from 6-14 inches above ground after physiological maturity.
Replicated Strip Trials
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Data collectedAerial ImageryGrain yieldStalk nitrate
Stalk Testing the Strip Tests
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Calibration data is consistent with recommendations.
Guided Stalk Sampling
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How do you represent this field?
Guided Stalk Sampling
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Four stalk nitrate samples
Three by soil map units
One sample based on image “deficiency”
Additional Analysis
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N
© 2007 Iowa Soybean Association
Stalk Nitrate Levels(By Category)
#0 Low (< 250 ppm)Marginal (250 - 700 ppm)Optimum (700 - 2,000 ppm)High (> 2,000 ppm)
#0#0#0
Soil Survey138B
GSS2007_475
TM
AdvancingAgricultural Performance
#0
#0
#0
#069
2058
13991170
162B
162C
163E3163C163D2
162C
163B
163E3
2007 Stalk Nitrate Samples
0 300 600 900 1200 1500 1800 2100 Feet
Trial Results
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Statewide Analysis
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The distribution of stalk nitrate samples across Iowa in 2007
Deficient Marginal Optimal
Excess
Applying adaptive management results in feedback data. One outcome is a “benchmark”
The benchmark can:
• provide a status of management to the public• track impact of programming• Impact regulations
Guided Stalk Sampling
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The benefit is multiplied by focusing on results in a group – not just an individual.
Group Results
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Guided Stalk Sampling Group
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Summary of stalk nitrate samples
Management practice
Sam
ple
perc
enta
ge
Differences between management practices are often observed at a group level.
Statewide Analysis
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The distribution of N forms is fairly well distributed.
For Additional Results
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