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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.

    Section I - Agronomic Nutrient Balance

    Calculate the agronomic nutrient balance for N, P205 and K20.

    N:NBalance  =  Line D  +  Line E  +  Line F  +  Line G  -  Line H(on the Worksheet)
    P205:P205Balance  =  Line D  +  Line G   -  Line H(on the Worksheet)
    K20:K20Balance  =  Line D  +  Line G   -  Line H(on the Worksheet)

    Discussion of Limits

    If the agronomic nutrient balance shows a negative number, a reduction in crop yield may be observed. Consider adding commercial fertilizer or increasing manure application rate.

    A positive number indicates over-application of nutrients (surplus) while negative numbers indicate under-application (potential deficiency) of nutrients for this crop. If nitrogen, phosphorus and/or potash balance exceeds 17 kg/ha (15 lbs/ac), then significantly more nutrients are being applied to the field than are required by the crop. It may be more economical to apply the extra nutrients to another field.

    Graphic of exclamation markIf the N or P205 agronomic balance (Line I) exceeds 17 kg/ha (15 lb/ac), complete Section J to M to calculate "Crop Removal Balance". If manure is fall applied, the Nitrogen Index may also need to be completed (Section O).

    Back to the Nutrient Management Workbook Table of Contents

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