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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. Glossary5. 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 M - Crop Removal Balance

    Calculate the crop removal balance for N, P205 and K20.

    N:NBalance  =   Line J  +  Line K  -  Line L(on the Worksheet)
    P205:P205Balance  =   Line J  +  Line K  -  Line L(on the Worksheet)
    K20:K20Balance  =   Line J  +  Line K  -  Line L(on the Worksheet)

    Discussion of Limits

    A negative balance indicates that this year's crop is removing more nutrients from the soil than are being added through manure and field inputs. Soil test values may decrease when the next soil test is completed.

    A positive balance indicates that manure and field input nutrients exceed those removed from the soil by this year's crop. Soil test values may increase when the next soil test is completed. Upper limits for the application of nutrients have been established and are outlined below.

    Exclamation mark A positive Nitrogen balance indicates nitrogen could be available after crop harvest. If Nitrogen balance (Line M) exceeds +17 kg/ha (+15 lb/ac) then complete the Nitrogen Index (Section O)

    Stop The total amount of Nitrogen (Line J + Line K) applied to the field should not exceed +224 kg/ha (+200 lbs/ac) (in any single year). Attach supporting documentation if this is the case. The exception is if OMAF crop recommendations show greater than 224 kg(200 lb) N requirement for the planned crop.

    Stop  The P205 balance (Line M) must not exceed +78 kg/ha (+70 lb/ac). If manure is applied once every two years, this limit may be raised to +191 kg/ha (+170 lb/ac). If manure is applied once every three years, this limit may be raised to +303 kg/ha (+270 lb/ac). Additional land base must be documented. Above these levels, the risk of surface water contamination may exist.

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    For more information:
    Toll Free: 1-866-242-4460
    E-mail: nman.omafra@ontario.ca