Nutrient Management Workbook Guide to Completing the Workbook - Sections
A to SThe workbook is a tool that simulates the NMAN Software. This workbook
is organized in sections, from A to S, with each line of the Worksheet corresponding
to the detailed descriptions found here help you develop the required information. Crop
Removal SectionSection N - Nitrogen
Available for Potential LossNote: This section can be skipped
if the 4 conditions listed below are met. Value B will be 0. The Nitrogen
Index is a tool for limiting nitrogen movement below the root zone in agricultural
fields. It consists of evaluating nutrient management practices for nitrogen remaining
after crop harvest and nutrients applied during the non-growing season to predict
potential nitrogen loss. The Value B portion of the Nitrogen Index is
0 if all of the following conditions are met: - N application
(from previous crop) is less than either agronomic requirement of N +17 kg/ha
(+ 15 lb/ac) OR Crop Removal of N + 34 kg/ha (+ 30 lb/ac).
- Total available
nitrogen applied is less than 224 kg/ha (200 lb/ac).
- Where manure applied
in late summer on an AA, A, or B hydrologic soil group, or in early fall on an
AA or A hydrologic soil group, a cover crop is established.
- Late summer/early
fall/late fall manure application is less than the rate shown for the livestock
type as shown in Table 11.
Table 11: Maximum Fall Manure Application Rates (before requiring N-Index)
| Livestock
Type | DM
range % | Maximum
Fall Rate1 for Manure Application on A or AA soils (with cover crop)
or B soils (no cover crop) | Maximum
Fall Rate1 for Manure Application on C or D soils or B soils (with
a cover crop) | | L/hectare | gallons/acre | L/hectare | gallons/acre |
| Liquid
Swine | 7
- 182 |
33700 |
3000 |
44900 |
4000 | |
5 - 7 |
39300 |
3500 |
51700 |
4600 | | 3
- 5 | 44900 |
4000 |
59500 |
5300 | |
<3 |
56150 |
5000 |
74100 |
6600 | |
Liquid Poultry |
10-18 |
28100 |
2500 |
37100 |
3300 | |
<10 |
33700 |
3000 |
44900 |
4000 | |
Liquid Dairy |
10-18 |
39300 |
3500 |
51700 |
4600 | |
6-10 |
56150 |
5000 |
74100 |
6600 | |
< 6 |
89800 |
8000 |
119000 |
10600 | |
Liquid Beef |
8-18 |
67400 |
6000 |
89800 |
8000 | |
< 8 |
89800 |
8000 |
119000 |
10600 | | |
tonnes/hectare | tons/acre | tonnes/hectare |
tons/acre | |
Solid Swine |
>18 |
22.2 |
10 |
29.1 |
13 | |
Solid Poultry |
60 - 100 |
9.0 |
4 |
11.2 |
5 | |
30 - 60 |
11.2 |
5 |
15.7 |
7 | |
18 - 30 |
15.7 |
7 |
20.2 |
9 | |
Solid Dairy Goats |
18 - 100 |
44.8 |
20 |
60.5 |
27 | |
All other Solid Manure |
18 - 100 |
67.3 |
30 |
89.7 |
40 |
1 Per one type of manure. If more than 1 type
is fall applied, the nitrogen index must be completed. All other application limits
apply. 2 Any ranges of numbers are considered to be greater than
the lower number, up to equal to the greater number. Determine
the proportion of Nitrogen available for loss during the non-growing season (ie.
fall/winter) from applications of manure or nitrogen fertilizers following crop
harvest. Use Total N values from Table 3, or from manure analysis, and the proportions
available for loss from Table 12. This will be used to determine Value B in the
Nitrogen Index (Section O). Total N (kg/1000 or lbs/1000 gal) divided by 1000
X Application Rate X N Available for Loss (Table 12) =
N Available for Loss
| Liquid__________ divided by 1000 x | ______L/ha
x | ____________ (Table 12) | = ___________ kg/ha |
| Liquid__________ divided by 1000 x | ______gal/ac | ____________
(Table 12) | =___________ lb/ac | Total
N (kg/tonne or lbs/ton) X Application Rate X N Available for
Loss (Table 11) = N Available for Loss
| Solid________ divided by 1000 x | ______tonne/ha
x | ____________ (Table 11) | = ___________ kg/ha |
| Solid________ divided by 1000 x | ______ton/ac x | ____________
(Table 11) | =___________ lb/ac |
Table 12: Estimate of
Nitrogen Available for Loss (Leaching or Denitrification) |
Application Time |
Incorporated (< 24 hours) |
Not Incorporated | |
Late Summer 2 |
Early Fall 2 |
Late Fall |
Pre-Plant 1 |
Side-dress 1 |
Early Fall 2 |
Late Fall 2 |
Pre-plant1 |
Side -dress 1 | |
Bare Soil |
Resi-due | |
Urea (commercialN) |
.8 | .7
| .5 |
0 | 0
| .4 |
.5 | 0
| 0 |
0 | |
Solid Cattle/Sheep |
.15 | .125
| .1 |
.05 | ---
| .1 |
.05 |
0 | 0
| --- |
| Unbedded Solid
Poultry3 | .4
| .3 |
.2 | .1
| --- |
.3 | .2
| .1 |
.05 | ---
| | Bedded
Solid Poultry | .4
| .3 |
.2 | .1
| --- |
.1 | .05
| 0 |
0 | ---
| | Liquid
Cattle | .4 |
.3 | .2
| .1 |
.05 | .3
| .2 |
.1 | .05
| 0 |
| Liquid Swine
| .6 |
.5 | .3
| .1 |
.05 | .3
| .2 |
.15 |
.1 | 0
| | Liquid
Bio-solids | .4
| .3 |
.2 | .1
| .05 |
.3 | .2
| .1 |
.05 | 0
| For manure incorporated within 3 days
Use: (Incorporated value + non incorporated value) / 2 Source:
Adapted from Barry, Beauchamp et. al., U of G. 2000 1 Assumes a
Spring planted crop; side-dress refers to application to a growing crop 2
Where a Fall cover crop is being grown, use "late Fall" value
3 Unbedded solid poultry manure is usually from caged layers and has
dry matter > 50% Late Summer = up to Sept 20, Early Fall
= Sept 21 to Nov 9, Late Fall = Nov 10 to Winter Back
to the Nutrient Management Workbook Table of Contents For more information:
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