|
Develop the Plan
Step One:
Estimate manure availability yearly:
- Number, type, size, handling
|
Example:
100 cow dairy
w/ replacements, semi-solid |
|
100 cows |
X |
21 ton/yr |
= |
2,100 ton |
|
60 heifers |
X |
10 ton/yr |
= |
600 ton |
|
40 calves |
X |
2 ton/yr |
= |
80 ton |
|
|
Total: |
2,780 ton |
|
X |
85% |
= |
2,363 ton |
|
(85% as the total amount
collectible) |
|
- A good rule of thumb to quickly calculate
how many acres are needed to dispose of all manure is to
take total number of cows times 1.5, then divide by 85%.
Step Two:
Prioritize fields based on nutrient needs and environmental
considerations (all tables courtesy of Univ. of WI):
|
Crop
N need |
Points |
|
Continuous corn |
10 |
|
Second year corn |
8 |
|
Corn following legume
forage |
1 |
|
Small grain |
6 |
|
Small grain (with
seeding) |
2-4 |
|
Topdress fair legume
stand |
2 |
|
Prior to direct
seeding alfalfa |
8 |
|
|
Soil
Test P and K |
|
Phosphorus |
Points |
Potassium |
Points |
|
> 150 ppm |
1 |
> 200 ppm |
6 |
|
75 – 150 ppm |
3 |
100 – 200 ppm |
8 |
|
30 – 75 ppm |
5 |
< 100 ppm |
10 |
|
< 30 ppm |
10 |
|
|
|
|
Field
Limitations |
|
Slope |
Points |
|
> 9% |
1 |
|
6-9% or 9-12% w/runoff
reduction practice |
3 |
|
2-6% or 6-9% w/runoff
reduction practice |
5 |
|
< 2% or 2-6%
w/runoff reduction practice |
10 |
|
Proximity to water |
Points |
|
Incorporated w/in 10 yr floodplain or
within 200’ of surface water |
1 |
|
Outside these
restrictions |
5 |
|
Soil Texture |
Points |
|
Sands, Loamy sands |
1 |
|
Sandy loams, loams or sands, loamy
sands spring applied |
3 |
|
Others or sandy loams, loams spring
applied |
5 |
|
Depth to bedrock |
Points |
|
0 – 10" |
0 |
|
10 – 20" |
1 |
|
> 20" |
5 |
|
Using the above tables as
reference, you can then rank each field:
|
Field |
Rotation |
P |
K |
Water |
Slope |
Texture |
Depth |
Rank |
|
1 |
CCC |
10 |
5 |
8 |
5 |
10 |
5 |
5 |
48 |
|
2 |
CCSb |
2 |
5 |
8 |
5 |
5 |
5 |
5 |
35 |
|
3 |
ACC |
8 |
3 |
8 |
5 |
5 |
5 |
5 |
39 |
|
4 |
AAC |
1 |
1 |
6 |
1 |
10 |
5 |
5 |
29 |
|
5 |
CCO-A |
2 |
5 |
8 |
5 |
5 |
5 |
5 |
35 |
|
6 |
CSbC |
8 |
3 |
6 |
5 |
5 |
5 |
5 |
37 |
|
7 |
AAA |
2 |
10 |
8 |
5 |
3 |
5 |
5 |
38 |
|
8 |
CSbW |
6 |
1 |
6 |
5 |
5 |
5 |
5 |
33 |
|
9 |
CCA |
8 |
3 |
6 |
5 |
5 |
5 |
5 |
37 |
|
Courtesy of Univ. of WI |
|
Step Three:
Allocate the manure based on ranking:
|
Field |
Rotation |
Rank |
Acres |
N
Rate |
Manure |
Used |
Left |
Loads |
|
|
|
|
|
lb/acre |
ton/acre |
ton |
ton |
|
|
1 |
CCC |
48 |
15 |
160 |
40 |
600 |
1763 |
60 |
|
3 |
ACC |
39 |
22 |
110 |
27 |
594 |
1169 |
59 |
|
7 |
AAA |
38 |
7 |
75 |
25 |
175 |
994 |
18 |
|
6 |
CSbC |
37 |
12 |
120 |
30 |
360 |
634 |
36 |
|
9 |
CCA |
37 |
2 |
75 |
25 |
300 |
334 |
30 |
|
2 |
CCSb |
35 |
13 |
75 |
25 |
325 |
9 |
33 |
|
5 |
CCO-A |
35 |
5 |
20 |
7 |
- |
- |
- |
|
8 |
CSbW |
33 |
10 |
20 |
7 |
- |
- |
- |
|
4 |
AAC |
29 |
20 |
0 |
0 |
- |
- |
- |
|
Courtesy of Univ. of WI |
|
When making the final
recommendation, however, any local regulations or restrictions
must be accounted for, as well as keeping the plan simple and
realistic so that the farmer will be able to follow it, such
as:
- If the manure is not incorporated, you
are restricted to a maximum P2O5
rate of 75 lb/acre
- Save flat and close fields for winter
spreading.
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