lake carmi watershed survey · 12/04/2018 · 85% of soil has as rusle2 tolerable soil loss...
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Lake Carmi Watershed Agricultural Assessment Dr. Heather Darby
April 12, 2018
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Total Acres - 7,538
Agricultural Acres - 1,428
Corn Acres – 229
Hay Acres - 1,120
Pasture Acres - 79
13 Land Operators
480 Heifers Located in Watershed
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Nutrient Management
88%
12%
NMP ?
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14%
31%
40%
13%
2%
0
100
200
300
400
500
600
0.0-2.0 2.1-4.0 4.1-7.0 7.1-20.0 >20
Num
ber
of
acre
s
Medium Optimum
Soil test phosphorus categories (ppm)
High ExcessiveLow
Soil Test Phosphorus Results by Category and Number of Acres
73% or 1,044 acres have
optimum levels or less of
soil test P (n=149).
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P Flow on field- input vs. harvest
Phosphorus crop need:
65.6 lbs/acre
Phosphorus supplied by manure
fertilizer: 34.3 lbs/acre
Crop is removing 48%
more P than is applied.
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Vermont P-Index Inputs• Location in VT
• Five groupings of counties
• Elevation
• STP
• Reactive Al
• Manure and fertilizer applications:
• Rate
• Method
• Timing (i.e., season)
• Time to incorporation
• Erosion rate from RUSLE2 or
WEPP
• Soil series/type and HSG
• Surface cover at time of planting
• Crop type
• Distance from field to waterway
• Vegetated buffer width
• Manure setback within field
• Presence of pattern tile drainage
system
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33%
53%
13%
[VALUE]%0
100
200
300
400
500
600
700
0-30 31-60 61-100 >100
Nu
mb
er o
f ac
res
Medium HighLow Very High
P-Index categories
P-Index Values by Category and Number of Acres
86% or 1,068 acres have a Medium or
Low P-Index value (n=149).
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RUSLE2- Soil Loss Prediction
Developed primarily to: • guide conservation planning
• inventory erosion rates
• estimate sediment loss from surface erosion
Estimates based on:• soil characteristics like erosivity and ability of soil to regenerate
• topography and climate
• management practices
o rotations
o cover crops
o cultivation practices
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What is “T”?
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75%
2%
14%
1%6%
1%0
100
200
300
400
500
600
700
800
900
1000
0.0-0.5 0.6-1.0 1.1-1.5 1.6-2.0 2.1-2.5 2.6-3.0
Num
ber
of
acre
s
Predicted annual loss (tons)
Predicted annual soil loss (tons/acre)
85% of soil has as RUSLE2 tolerable soil
loss between 2-3 tons/acre.
100% of farms meet requirement
92% exceed requirement
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Conservation Practice Acres
Cover Crop/Residue 72%
Reduced Tillage 82%
Crop Rotations
(hay/corn) 27%
Manure Injection 63%
Percentage of Corn Acres in Various Conservation Practices
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Location 2008 2018
1 300 dairy cows 300 heifers
2 50 dairy cows 0
3 200 heifers 50 heifers
4 200 heifers 130 heifers
5 50 dairy cows 0
Change in cow population from 2008 to 2018
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To assist the Hungerford Brook, St.
Albans Bay, Rock River, and Pike River
watershed groups to increase the
implementation of conservation practices
on farms within the watersheds.
NRCS-CIG Cooperative AgreementProject No. NRCS-ADS-093