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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...

    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 E – Previous Crop Nitrogen

    Use the following chart to determine the reduction in nitrogen requirement for this year’s crop.

    Table 7: Nitrogen Contribution From Previous Crop

    Crop

    		N (kg/ha)

    N     (lb/ac)

    Established Forage – < 1/3 legumes

    		0

    0

    Established Forage – 1/3 to 1/ 2 legumes

    		56

    50

    Established Forage – over 1/ 2 legumes

    		112

    100

    Perennial Legumes plowed in Seeding Year

    		45

    40

    Corn following Soybeans (< 2800 chu)

    		34

    30

    Corn following Soybeans (> 2800 chu)

    		17

    15

    Corn following Silage Corn (< 2800 chu)

    		11

    10

    Corn following Cereals – straw removed (< 2800 chu)

    		11

    10

    Other crops

    		0

    0

    Source: OMAF Publication 811 – Agronomy Guide for Field Crops

    Example:
    A corn field that receives 2900 crop heat units (chu) was planted to soybeans last year. Using table 7, the N contribution for this year’s crop is 15 lb/ac.

    Back to the Nutrient Management Workbook Table of Contents

    For more information:
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    E-mail: nman.omafra@ontario.ca