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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...

    Glossary

    Ammonium-N
    is the most common form of mineral N in manure and other organic soil amendments. It is as available to plants as fertilizer nitrogen, but is also subject to loss into the air if manure is left laying on the surface of the soil. Ammonium N will bind to soil particles so does not normally leach.

    K20
    Potash (K20) is the form in which fertilizer potassium is expressed. To calculate the fertilizer replacement value of potassium from various sources, it has to be converted from elemental K to potash, and then multiplied by an availability factor.

    Manure
    Manure includes only agricultural source material other than commercial fertilizer.

    Nitrogen (N)
     N is the chemical symbol for nitrogen. It is present in soil and organic materials in three main forms: Ammonium-N, Nitrate-N, and Organic N. The availability of the nitrogen to plants depends on its form.

    Nitrate-N
     Most ammonium-N is converted into nitrate-N in the soil before being taken up by plants. If there is more N than the plants can absorb, it can leach downwards with soil water, creating a risk to groundwater quality.

    Nutrient Management Plan
    An NMP is a document prepared for a farm that gives an assessment of what application rate is appropriate for the land base and what other standards for land application must be met.

    Nutrient Management Strategy
    An NMS is a document prepared for a farm that shows how much prescribed material(s) is going to be produced over a five-year period, as well as how it will be stored and where it will be used.

    Organic N
    Much of the nitrogen in manure and other soil amendments is in the organic form. This is not available to plants until it has been converted into ammonium-N. The rate at which this occurs depends on temperature and moisture, as well as on degradability of the organic material.

    P205
     Phosphate (P205) is the form in which fertilizer phosphorus is expressed. To calculate the fertilizer replacement value of phosphorus from various sources, it has to be converted from elemental P to phosphate, and then multiplied by an availability factor.

    Surface Water

    • Natural or artificial channels flowing all year or occasionally with wetland
    • lakes, reservoirs, ponds or wetlands
    • Does not include: grassed waterways, furrows, roadside ditches, areas normally farmed, or artificial water bodies intended for the storage of treatment of runoff from farm animal yards and manure storages.

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    Conversions – Metric and Imperial
    Common Conversions

    1 gallon

    =

    4.546 litres

    1 gallon

    =

    1.201 US gallons

    1 gallon

    =

    0.161 ft3

    1 US gallon

    =

    3.785 litres

    1 US gallon

    =

    0.833 Imp gallons

    1 ton

    =

    0.907 tonne

    1 pound

    =

    0.454 kilogram

    1 tonne

    =

    2205 pounds

    1 foot3

    =

    6.229 gallons

    1 acre

    =

    0.405 hectare

    1 acre

    =

    43,560 feet2

    1 lb/ac

    =

    1.12 kilogram/hectare

    1 ton/ac

    =

    2.25 tonnes/hectare

    1 gal/ac

    =

    11.2 litre/hectare

    1000 gal/ac

    =

    11200 litre/hectare

    1000 gal/ac

    =

    11.2 metre3/hectare

    1 metre

    =

    3.28 feet

    1 metre

    =

    39.4 inches


    Application Rate Conversions
    Metric to Imperial (Approximate)

    Litres per hectare x 0.09

    =

    gallons per acre

    Litres per hectare x 0.36

    =

    quarts per acre

    Litres per hectare x 0.71

    =

    pints per acre

    Millilitres per hectare x 0.015

    =

    fluid ounces per acre

    Grams per hectare x 0.015

    =

    ounces per acre

    Kilograms per hectare x 0.89

    =

    pounds per acre

    Tonnes per hectare x 0.45

    =

    tons per acre

    Kilograms per 1000L x 10 = lbs per 1000 gallons
    Imperial to Metric (Approximate)

    gallons per acre x 11.23

    =

    litres per hectare (L/ha)

    quarts per acre x 2.8

    =

    litres per hectare (L/ha)

    pints per acre x 1.4

    =

    litres per hectare (L/ha)

    fluid ounces per acre x 70

    =

    millilitres per hectare (mL/ha)

    tons per acre x 2.24

    =

    tonnes per hectare (t/ha)

    pounds per acre x 1.12

    =

    kilograms per hectare (kg/ha)

    ounces per acre x 70

    =

    grams per hectare (g/ha)

    Pounds per ton x .5 = Kilograms per tonne

    Back to the Nutrient Management Workbook Table of Contents

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    E-mail: nman.omafra@ontario.ca