Soil nitrate testing protocol development for lands receiving injected manure
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Transcript of Soil nitrate testing protocol development for lands receiving injected manure
Soil Nitrate Testing Protocol Development for Lands Receiving Injected Manure
Robb MeinenSenior Extension Associate, Penn State Dept. of Animal Science
Seeking PhD in Soil [email protected] (814) 865-5986
NESARE Team - Doug Beegle, Heather Karsten, Peter Kleinman,Glenna Malcolm, Justin Dillon
CIG Team – Heather Karsten, Ron Hoover, Jeff Graybill, Mena Hautau, Mark Madden, Jennifer Bratthauer
Inject vs. Broadcast Manure in Corn1. Rock Springs – NESARE & Other plots
2. CIG Grant – Berks, Franklin, Lancaster Counties Shallow-disc injection equipment in 3 counties
2-3 cooperating sites/county/year
Benefits of Injection
• Maintain soil cover – consistent with no-till standards of >30% soil surface disturbance
• Odor
• NH3 loss (volatilization)
• Dissolved P Runoff
• Total P Runoff
• High P / P-Index restricted fields – Better N balance
Tradeoffs
• Slower, Narrow swath width
• Requires more horsepower (up to 30%) & fuel
• More passes = more compaction???
• Equipment costs
• Contract haulers charge higher rate
• Not everyone wants a lower application rate
PSNT in Pennsylvania
Pre-Sidedress Nitrate Test for corn
• 12” soil core
• When corn is ~ 6 leaf stage (10-20”)
• Nitrate < 21 ppm means additional N fertilizer is needed
• Calculation conducted to determine N-rate
Objective
• The PSNT becomes suspect on grounds receiving manure injection. Random sampling near manure bands may give artificial confidence in NO3 availability, while samples away from bands may indicate unnecessary need for commercial fertilizer.
• The purpose of this work was to determine a PSNT sampling protocol for soils receiving injected manure.
Core Sample (12”)
Manure bands30” spacing
Hoping to develop PSNT protocol
for lands with banded injected manure
PSNT testing protocol in banded manure corn
needs definition.
Is there a sampling pattern that
producers can implement in any field?
2012 Monolith Site
Composite Sample N03
4 treatments
Treatment nMean Nitrate
(ppm)Standard Deviation
Control (no manure) 3 5.9 1.5
Broadcast Manure 3 8.3 1.7
Broadcast followed by Till 3 11.5 4.7
Shallow-disc Injection 3 13.2 2.8
-15……..-10………..-5…..-2…0.…2……5………..10………..151
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2-Point 15”-Spaced sampling considered at all points
along the 30” space.
We want a sampling protocolthat will not require the injection location to be located.
-15……..-10………..-5…..-2…0.…2……5………..10………..151
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-15…-12………….-6……………0.……..……6…………..12….15
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5-Point 6”-Spaced sampling compared to 2-Point sampling.
20 cores (4 sets) 6” are better than 20 cores (10 sets) 15”
-15…-12………….-6……………0.……..……6…………..12….15
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Both manners of sampling give the same mean = 17.05 ppm N03
Standard Deviations:• All samples without pairing 14.2• 2-Point sampling 11.9• 5-Point sampling 8.9
When we get to 20 cores…
SNYDER ROAD
BER
NV
ILLE
RO
AD
6 5 4 3 2 1
120 0 90 60 150 30 502 Inject
150 0 60 90 30 120 501 Broadcast
60 30 0 120 150 90 402 Broadcast
0 150 90 30 60 120 401 Inject
120 80 160 0 200 40 4 Control
90 0 60 150 30 120 302 Inject
90 60 150 120 30 0 301 Broadcast
60 90 0 30 120 150 202 Broadcast
30 120 60 90 0 150 201 Inject
80 0 160 200 120 40 3 Control
0 120 30 60 90 150 102 Inject
150 120 90 30 60 0 101 Broadcast
• Control (no manure) check plots at each site
• Fertilizer rates allow establishment of response curve
Data Collection of:• PSNT• Corn Stalk Nitrate• Yield
“Next Step” – Verification
1. Trade Show
2. Education
3. DemonstrationsChambersburg, PA
Hope to see you at the
2015 North American Manure Expo
July 14 – Tour Day
July 15 – Exposition Day
manureexpo.org