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Executive summary

Increases in hemp and cannabis production in Ontario have resulted in numerous inquiries from growers on how foliar symptoms relate to various nutrient deficiencies. Resources for visual identification of nutrient deficiency symptoms in hemp are limited. Those currently available typically have old, poor-quality photos that do not cover the full nutrient spectrum or the progressive development of deficiency symptoms seen in the field.

The ability to identify nutrient deficiencies quickly and accurately allows growers to improve nutrient use efficiency, crop health and overall yields of marketable product. This pictorial guide was developed for growers to better identify foliar symptoms caused by nutrient deficiencies in Cannabis sativa plants.

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Disclaimer

If you require this information in an alternative format, please contact ag.info.omafra@ontario.ca. We will:

  • acknowledge your request within 3 business days
  • provide you with the content within 15 business days