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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.

    Agronomic Nutrient Balance (Section D to Section I)

    Section F - Previous Manure Nitrogen

    Calculate the amount of nitrogen from previously applied manure that is available to this year's crop. Then total the result for each for the past three years and place the number on Line F on the Workbook Field Summary.

    If a representative manure test is available, use the following formula to determine the organic N content of the manure.
    (To convert % to kg/1000 L or kg/tonne multiply by 10. To convert: % to lb/1000 gal, multiply by 100; % to lb/ton, multiply by 20)

    If a manure test is not available, use Table 3 in Section "C".

    (Metric)

    % Total N - % NH4-N = % Organic N

    		% organic N________ x 10 =_________ kg/1000 L
    (divide by 1000 for kg/L)
    % organic N________ x  10 =__________ kg/tonne

    Year of manure application

    Manure Type
    Applied

    Rate Applied

    Organic N
    (kg/L or
    kg/tonne )

    Portion of Organic N available to crop

    		Total

    Last year

    		 

    x

    x

    0.10 =

    kg/ha

    2 years ago

    		 

    x

    x

    0.05 =

    kg/ha

    3 years ago

    		 

    x

    x

    0.02 =

    kg/ha

    Total =

    kg/ha

     

    (Imperial)

    % Total N - % NH4-N = % Organic N

    		% organic N________ x 100 =_________ lb/1000 gal
    (divide by 1000 for lbs/gal)
    % organic N________ x  20 =__________ lb/ton

    Year of manure application

    Manure Type
    Applied

    Rate Applied

    Organic N
    (lb/gal or lbs/ton)

    Portion of Organic N available to crop

    		Total

    Last year

    		 

    x

    x

    0.10 =

    lb/ac

    2 years ago

    		 

    x

    x

    0.05 =

    lb/ac

    3 years ago

    		 

    x

    x

    0.02 =

    lb/ac

    Total =

    lb/ac

    Example:

    Last year liquid swine manure was applied to this field at 5000 gal/ac and three years ago at 7000 gal/ac. The manure, when tested, had an organic N content of 0.19% (19 lbs/1000 gal or 0.0190 lb/gal).

    Last year: 
    5000 gal/ac   X   0.0190 lb/gal   X    0.10  =
    		9.5
    Two years ago:
     none  =
    		0
    Three years ago:
    7000 gal/ac   X   0.0190 lb/gal   X    0.02  =
    		2.5
    Total:    
      =
    		12 lbs/ac available N (Line F)

    Back to the Nutrient Management Workbook Table of Contents

     

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