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Nutrient Management Workbook

Author: OMAFRA Staff
Creation Date: 10 December 2003
Last Reviewed: 25 November 2004
1. Farmstead Information
  • Part 1
  • Part 2
    		• 2. Nutrient Management Workbook Summary
  • Metric Version
  • Imperial Version
    • 3. Guide to Completing the Workbook - Sections A to S
    1. Section A - Field Information
    2. Section B - Maximum Allowable Liquid Loading Rate
    3. Section C - Manure Information
    4. Section D - Commercial Fertilizer
    5. Section E - Previous Crop Nitrogen
    6. Section F - Previous Manure Nitrogen
    7. Section G - This Year's Manure
    8. Section H - Ontario Crop Production Requirements
    9. Section I - Agronomic Nutrient Balance
    10. Section J - Field Inputs
    1. Section K - Manure Nutrients Applied
    2. Section L - Crop Removal
    3. Section M - Crop Removal Balance
    4. Section N - Nitrogen Available for Potential Loss
    5. Section O - Nitrogen Index
    6. Section P - Phosphorous Index
    7. Section Q - Minimum Separation Distance from Surface Water
    8. Section R - Useable Acreage
    9. Section S - Maximum Rates
    4. Glossary 5. For More Information...

    Guide to Completing the Workbook – Sections A to S

    The 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 Section

    Section N – Nitrogen Available for Potential Loss

    Note: 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:

    1. 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).
    2. Total available nitrogen applied is less than 224 kg/ha (200 lb/ac).
    3. 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.
    4. 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

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