The Ontario Phosphorus and Potassium Database

corn field with blue sky in background

Did you know that a review of Ontario phosphorus (P) and potassium (K) fertilizer guidelines was undertaken? The work looked at crop responses to P and K for corn, soybeans, winter wheat and alfalfa from 368 trials conducted over the last several decades. It compared most economic rates to current Ontario fertilizer guidelines as found […]

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2021 Corn Seasonal Summary

Corn field southwest of London showing stress and variability from excessive rainfall from late June through August.

Planting In March 2021 Statistics Canada estimated Ontario farmers intended to plant 2.2 million acres of grain corn, 3% higher than the 5-year (2016-2020) average seeded acres of 2.14 million acres (OMAFRA Crop Statistics). Spring 2021 provided a great start for planting. While April generally remained cool, lack of rainfall provided excellent soil conditions with […]

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Canadian Bt Corn Trait Tables for April 2021

The Canadian Bt Corn Trait Tables have been updated for April 2021. English:  Canadian Bt Corn Trait Table for April 2021  French: Maïs Bt disponibles au Canada (Avril 2021) For information on which hybrids or products have obtained EU approval, visit the Canadian Seed Trade Association’s corn hybrid database at: Pour plus d’informations sur les hybrides […]

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Agronomy Guide For Field Crops – Corn – Fertility – Nitrogen

Nitrogen (N) Corn responds well to nitrogen, so adequate availability of nitrogen is critical to profitable corn production. Excess nitrogen adds unnecessary expenses and increases the risk of nitrate movement to ground water, poorer quality of surface water and production of greenhouse gases through nitrous oxide emissions. Insufficient nitrogen leads to nitrogen deficiency. Nitrogen deficiency […]

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Agronomy Guide For Field Crops – Corn – Emergence and Spacing Uniformity, Replant Decisions


Uniformity of Emergence Uniform seeding depth is a critical factor in achieving uniform emergence. Uneven emergence affects crop performance, because competition from larger, early-emerging plants reduces the yield potential of smaller, later-emerging plants. Yields can be reduced by 5% when half the stand suffers from a 7-day delay in emergence and by 12% when half […]

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