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University of Minnesota Extension

How to calculate herbicide rates and calibrate herbicide applicators

Uniformly applying herbicides at proper rates is essential for effective weed management. A slight variation in the application rate with some chemicals may result in poor control of the pest or injury to the crop or environment, causing lost time, effort and money.

How to calculate




Conversion factors


John A. True, emeritus Extension engineer


Reviewed by Jonathan Chaplin, agricultural engineer, College of Science and Engineering and the College of Food, Agricultural and Natural Resource Sciences

Reviewed in 2021

Page survey

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