Increasing canola yields with Smart Nutrition™ MAP+MST®

Canola grown at northern latitudes is subject to cooler soils and shorter growing seasons. For these reasons, timing of nutrient availability to the plant is essential to maximize canola production.


A summary of canola trials conducted in 2018 near Fort Vermilion, Alberta, Canada shows higher yields with ammonium sulfate (AMS) applications compared to Smart Nutrition MAP+MST potentially due to limited sulfur availability due to cooler soil conditions that result in slower oxidation early in the growing season. Whole plant vegetative tissue taken prior to flowering confirm higher sulfur concentrations in AMS plots compared to Smart Nutrition MAP+MST. For this reason, a fertilizer blend 75/25 or 50/50 of Smart Nutrition MAP+MST to AMS is recommended at more northern latitudes where cooler soil temperatures prevail.


Elemental sulfur as Micronized Sulfur Technology (MST®) requires oxidation to sulfate to become plant available. In cool soils, oxidation rates decrease resulting in limited sulfur availability if applied too late during the growing season. However, lower oxidation rates in cool soils can allow for versatility with fall applications of Smart Nutrition MAP+MST in various production systems. 

Canola response to sulfur application is common in many areas that experience cooler soil temperatures due to slower soil mineralization – microbial driven soil process where soil organic matter is broken down resulting in plant available nitrogen, phosphorus, and sulfur. Canola production in fields with low soil organic matter or coarse textured soils could benefit from supplemental application of sulfur with fertilizers such as Smart Nutrition MAP+MST.