Application Technology: Determining Amount of Herbicides Needed

Table of Contents

1. Determining Amount of Product Per Hectare
2. Determining Amount of Product Required Per Tankful
3. Other topics in Application Technology
   • Introduction
   • Care and Use of Equipment
   • Sprayer Calibration
   • Materials, Mixing and Mixtures
4. Related Links

Determining Amount of Product Per Hectare

Most rates suggested in this publication are given in terms of both active ingredients (common name) per hectare and product (Trade Name) per hectare. However, where the amount of active ingredient in the formulations varies considerably (for example, 2,4-D is available in concentrations of 100 grams/L, 400 grams/L, 500 grams/L, etc.) The rate is given in terms of active ingredient only.

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Determining Amount of Product Required Per Tankful

After determining how much commercial product is needed per hectare, calibrate the sprayer and determine the number of hectares each tank will cover. Determine the quantity of herbicide needed to add to the spray tank using the following formula:

Product required/tank = hectares covered by tank x product rate/ha

Sample calculations:

(a) product/tank = 4.1 ha per tank x 2.2 kg/ha
            = 9.02 kg Lorox/tank

(b) product/tank = 4.1 ha x 4.5 L/ha
                                = 18.45 L Atrazine/tank

Follow manufacturer's recommendations on mixing order and procedures.

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Related Links

• Weeds in Ontario
• OMAFRA Sprayer Calibration Calculator
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control

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