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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.

    Section P – Phosphorus Index

    This section needs to be completed if the P soil test exceeds 30 mg/L (ppm). The P-Index is divided into 5 sections. Add the values from each section to get the total P-Index.

    Note: For a more detailed analysis of the Phosphorus Index refer to the Nutrient Management Computer Program (NMAN) or Phosphorus Index Factsheet.

    Table a: Soil Erosion Value

    Slope within 150 m (492 ft) of Watercourse

    Length of Slope

    Hay

    Other Crops

    Up & Down Slope

    Cross Slope

    Plow

    No-till

    Plow

    No-till

    Flat (< 0.5%)

    All

    2

    4

    2

    4

    2

    Gentle (0.5 to < 2%)

    Short ( 61 m) (200 ft)

    2

    4

    2

    4

    2

    Medium (244 m) (800 ft)
    2
    8
    3
    8
    2

    Long (488 m) (1600 ft)

    2

    16

    4

    16

    2

    Moderate(>2 to < 5%)

    Short (61 m) (200 ft)

    2

    16

    2

    8

    2

    Medium (244 m) (800 ft)
    2
    16
    4
    12
    3

    Long (488 m) (1600 ft)

    2

    16

    8

    16

    4

    Steep (> 5%)

    Short (61 m) (200 ft)

    2

    16

    4

    16

    4

    Medium (244 m) (800 ft)
    2
    16
    8
    16
    8

    Long (488 M) (1600 ft)

    2

    16

    16

    16

    16

    Note: These values simulate a worst case scenario of soybeans on very fine sand in a high rainfall area. To obtain more accurate results using the universal soil loss equation refer to the NMAN nutrient management software.

    Table b: Water Runoff Value

    Hydrologic Soil Group
    (Drainage Class)

    Maximum Field Slope within 150m of Top of Bank of Surface Water

    < 3%

    3 - 6%

    6 - 9%

    9 - 12%

    A (Rapid)

    1

    1

    2

    8

    B (Moderate)

    1

    2

    4

    8

    C (Slow)

    2

    4

    8

    16

    D (Very Slow)

    4

    8

    8

    16

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

    Table c: P Soil Test Value

    P Soil Test

    Factor

    < 15 mg/l (ppm)

    2

    15 – 30 mg/l (ppm)

    4

    31 – 60 mg/l (ppm)

    8

    61 – 100 mg/l (ppm)

    16

    > 100 mg/l (ppm)

    32

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    Table d: P205 Fertilizer Value (Metric)

    Rate (Line D)

    Method

    (kg / ha)

    Placed with Planter

    Incorporated < 2 weeks

    Incorporated > 2 weeks

    Not Incorporated

    None

    0

    0

    0

    0

    < 50

    2.5

    4

    7

    13

    51 - 75

    3.5

    5

    8

    14

    > 75

    5.5

    7

    10

    16

     

    Table d: P205 Fertilizer Value (Imperial)

    Rate (Line D)

    Method

    (lb / ac)

    Placed with Planter

    Incorporated < 2 weeks

    Incorporated > 2 weeks

    Not Incorporated

    None

    0

    0

    0

    0

    < 45

    2.5

    4

    7

    13

    46– 67

    3.5

    5

    8

    14

    > 67

    5.5

    7

    10

    16

     

    Table e: P205 Manure Value (Metric)

    Rate (Line K)

    Method

    (kg / ha)

    Injected

    Incorporated < 5 days

    Not Incorp: Cover Crop

    Not Incorp: Bare Soil

    None

    0

    0

    0

    0

    < 37

    2.5

    4

    7

    13

    38 – 60

    3.5

    5

    8

    14

    > 61

    5.5

    7

    10

    16

     

    Table e: P205 Manure Value (Imperial)

    Rate (Line K)

    Method

    (lb / ac)

    Injected

    Incorporated
    < 5 days

    Not Incorp:
    Cover Crop

    Not Incorp:
    Bare Soil

    None

    0

    0

    0

    0

    < 33

    2.5

    4

    7

    13

    34 – 54

    3.5

    5

    8

    14

    > 54

    5.5

    7

    10

    16

    Example:
    a)     corn no-till planted on a short 3% slope: 2
    b)     hydrologic soil group C on a 3% slope: 4
    c)     P soil test of 35 ppm: 8
    d)     9 lb/ac, placed with planter: 2.5
    e)     128 lb/ac P205 applied in manure, incorporated 3 days: 7

    Total P-Index = a) + b) + c) + d) + e)

    Total P-Index = 2 + 4 + 8 + 2.5 + 7 = 23.5

    Back to the Nutrient Management Workbook Table of Contents

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