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Steps to Develop a Nutrient Management Plan for Sunnyside Acres Using Snap-Plus
Requirements for Assignment
FISC Soil and Crop Nutrient Management
Step 1 – Based on the field map describe a soil sampling strategy for each field that will result in the taking of the
proper number of soil samples. (Hint: Remember 5 acres per sample or fewer samples if both P and K are excessively
high. See UWEX Pub. A2809 p. 3 for guidance on sample numbers for excessively high fields). On the Snap-Plus farm
screen select crops to be grown in 2012 and county, fill in your name and address, write a short narrative about what
you are doing. Rotation starts in 2009 and 2012 is the last year of the 4 year rotation sequence. (C=corn grain,
Cs=corn silage, A=Alfalfa, As=alfalfa seeding, S=soybean)
Step 2 – On the field screen enter field ID, acreage, county (Sauk), major soil type (dominant soil if 10% or more of
field area), slope (A:0-2%, B:2-6%, C:6-12%, D: 12-18%), set slope length to 300, set slope below field to 0-2%,
measure distance to perennial water “blue line” stream, and start rotation for all fields in 2012.
Step 3 – Enter average soil test data (given in slide #5) for each field on the soil test screen. Note: Use separate
screen for each field.
Step 4 – Create an inventory of on-farm nutrient resources. (Legume N credits and manure credits). Consider that all
rotated alfalfa stands are poor and cut to less than 8 in. No second year alfalfa credits. Manure is not stored (daily
haul) and all manure is surface applied. Manure type is semi-solid stalk bedded.
Step 5 – Develop a manure allocation strategy using method shown in class for crop year 2012 using a P-based
strategy that applies no more than 75 lb P2O5 (25 t/a). Note fields with manure spreading restrictions (no winter
spreading if 300 ft. from stream, manure must be incorporated if otherwise spread w/in 300 ft. of stream.
Step 6 – Based on the crop rotation for each field show the nutrients provided by manure and legume forage and
show the final adjusted N, P2O5, and K2O recommendation for the 2012 crop year.
Step 7 – List the Phosphorus Index for each field in 2012 comparing all no-till or all fall chisel/disk. Fill in blanks and
print out or send as pdf to complete the assignment.
Field 8
20 a
Field 9
12 a
Field 5
18 a
Field 6
12 a
Field 7
20 a
Field 4
21 a
Field 1
35 a
Field 2
29 a
Field 3
33 a
1000 ft.
Individual Field Soil Type and Slope Selection
pH
Organic
Matter
P
K
CCCC
6.2
2.9
20 O
95 O
29
AsAAC
6.6
3.2
24 H
100 O
3
33
ACCC
6.7
3.3
150 EH
170 EH
4
21
CSCS
6.5
3.2
110 EH
160 EH
5
18
CsAsAA
6.1
2.0
16 L
110 H
6
12
CCCA
6.9
2.8
20 O
100 O
7
20
AsAACs
6.3
2.9
90 EH
100 O
8
20
CAAA
6.0
2.2
15 L
90 O
9
12
CsAsAA
6.6
2.1
25 O
120 H
Field
Acres
Rotation
1
35
2
Soil
Type
Slope
Soil Sampling Strategy
Field
1
2
3
4
5
6
7
8
9
Soil test P
category
Soil test K
category
Number of samples
Special considerations
Manure Generation Spreadsheet
Livestock
Type
Number
Milking and
dry cows
(21 t/yr)
75
Large heifers
(15 t/yr)
15
Small heifers
(7.5 t/yr)
30
Calves
(2 t/yr)
30
Totals
Manure Produced
Manure Collected
(produced x 0.85)
Manure Allocation Ranking Spreadsheet
Field
Acres
1
35
2
29
3
33
4
21
5
18
6
12
7
20
8
20
9
12
Rotation
Soil
Test P
Soil
Test K
Distance
to Water
Slope
Texture
Soil
Depth
Final
Rank
Tons/
field
Manure
Balance
Final Nutrient Application Plan and Phosphorus Index
Manure
Field
1
2
3
4
5
6
7
8
9
Rate
(ton/a)
P2O5
applied
(lb P2O5/a)
K2O
applied
(lb K2O/a)
Legume N
credit
(lb N/a)
Net Fert.
N rate
(lb N/a)
Net Fert.
P2O5 rate
(lb P2O5/a)
Net Fert.
K2O rate
(lb K2O/a)
Phosphorus Index
(Fall Chisel/disk)
Phosphorus
Index
(No-till)