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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 B - Manure Application Information

    Enter the description, time of application, and incorporation details for the manure applied between December 1 and March 31. See Nutrient Management Act for restrictions or requirements. Estimate a manure application rate. For liquid manure, make sure that the rate does not exceed the maximum allowable application rate specified in Section S. To determine the maximum allowable rate per application, find your Runoff Potential in Table 1. Then, using the Runoff Potential Factor, find the maximum allowable liquid loading rate in Table 2. You may consider several separate applications to allow higher rates (provided nutrient levels are acceptable and there is only a single application within 24 hours). For solid manure, or liquid manure application on slopes less than 3%, it is not necessary to evaluate the maximum application rate for runoff concerns.

    Slope determination is required when within 150 m (493 ft) from surface water. Where a measured slope is not available a default slope value of 7% is used in the NMAN Software.

    Table 1: Runoff Potential
    Hydrologic Soil Group
    (Drainage Class)    		 Maximum Field Slope within 150 m of surface water
    < 3% 3 - <6 % 6 - <9 % 9 - 12 %
    A (Rapid) Very Low Very Low Low High
    B (Moderate) Very Low Low Moderate High
    C (Slow) Low Moderate High No Application
    D (Very Slow) Moderate High High No Application

    Hydrologic Soil Groups corresponding to the various soil series names found in Ontario are listed in Table 17. Group A is often associated with sand, Group B with loam, Group C with clay loam and Group D with clay soil textures.

    Table 2: Maximum Application Rate

    Runoff
    Potential

    Surface Applied

    Incorporated or Pretilled

    m3/hagal/acm3/hagal/ac

    High

    50

    4450

    75

    6700

    Moderate

    75

    6700

    100

    8900

    Low

    100

    8900

    130

    11600

    Very Low

    130

    11600

    150

    13400

    The Application rate must not exceed the numbers in Table 2. Note: 1m3 = 1000 L

    Example:
    A farmer planned an application rate of 3000 gal/ac, surface applied. For the clay loam soil (hydrologic soil group C-slow) on a 4% slope, the runoff potential is moderate. The selected rate is less than the maximum allowable rate of 6700 gal/ac.

    Back to the Nutrient Management Workbook Table of Contents

     

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