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Copy link On-Demand Webinar: Are You Replenishing Sulphur Effectively After Harvest? Strategies for 2026
How sulphur deficiency, nutrient removal, and modern sulphur sources like polyhalite (Polysulphate) are shaping fertility decisions in Western Canada for 2026.
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Tackling Sulphur Deficiency in Western Canadian Cropping Systems
Sulphur deficiency is now one of the most common yield-limiting factors across Western Canadian fields. Higher yields, modern genetics, and reduced atmospheric sulphur deposition mean growers are removing more sulphur every year—often without fully replacing it. So how do we efficiently replenish sulphur to maximize yield and profitability? Our ICL agronomy experts share practical, data-driven strategies to address this challenge.
Watch the On-Demand Webinar
Connecting nutrient removal trends with real-world field observations, we explore how to build more resilient fertility programs for 2026 and beyond.
Key Takeaways at a Glance
- Sulphur deficiency is now widespread across the Prairies, affecting up to 40% of cropped acres.
- Higher yields and modern genetics are increasing sulphur removal rates year over year.
- Deficiency symptoms are often subtle, uneven, and easily missed — making reactive management risky.
- Sulphur source, placement, and release pattern strongly influence nutrient availability and efficiency.
- Polysulphate® delivers low-salt, season-long sulphur alongside potassium, calcium, and magnesium, supporting early vigor and sustained crop nutrition.
Understanding the Sulphur Challenge: Why Sulphur Matters More Than Ever
As yields rise and crop genetics advance, demand for sulphur (S) has grown, especially across crops with high S demand, like canola and alfalfa. Meanwhile, cleaner air regulations in the US have reduced natural atmospheric sulphur deposition from rainfall.
“Modern crop genetics are incredibly efficient, but like high‑performance engines, they need the right fuel — and sulphur is a big part of that equation.”
Early-season deficiencies often show as pale new growth and delayed development. Later, they can cause thin stands, uneven maturity, and poor seed fill. Because symptoms are patchy, shortages are often underestimated—making proactive planning essential.
What Nutrient Removal Data Tells Us About 2026 Planning
Updated nutrient uptake and removal guidelines reinforce the importance of replacing sulphur removed at harvest.
- Canola: ~10 lb/ac
- Wheat, peas, barley: 5–6 lb/ac
- Alfalfa: 27–33 lb/ac
- Potatoes: 16–20 lb/ac
These figures highlight why sulphur should be planned proactively — not reactively — when building fertility programs for the following season.
Choosing the Right Sulphur Source
Rethinking Sulphur Sources Through a 4R Lens
- Fast-release sulphur sources can provide immediate availability but are more vulnerable to leaching, particularly under wet spring conditions.
- Elemental sulphur, while effective over the long term, depends heavily on soil temperature, moisture, and microbial activity to convert into plant-available sulphate — often too slowly to support in-season crop needs.
- Polysulphate® occupies a distinct position among sulphur fertilizers. It contains potassium, calcium, magnesium and sulphur — all in sulphate form.Its gradual release over ~50 days matches crop uptake, reduces loss risk, and supports early vigor.
“Our data consistently shows that placing a gentle, multi‑nutrient sulphur source (Polysulphate) close to the seed gives crops a stronger start and supports yield potential throughout the season.”
Polysulphate Performance in the Field
Beyond plant‑available sulphate nutrient, Polysulphate’s low salt index and low chloride content make it safe for seed placement, even in sensitive crops.
Trials highlighted several agronomic benefits:
- Increase in canola stand establishment
- Stronger early vigor and uniform emergence
- Significant yield gains in sulphur-responsive canola
- Improved forage quality in alfalfa
“Protecting seed and stand establishment is really about protecting profit.”
Designed for Western Canadian Systems: Looking Ahead to 2026
Polysulphate has been refined to fit the practical realities of Western Canadian cropping systems. Polysulphate Premium prill designed for air seeders, flexible application options, and expanded logistics and storage capacity all support consistent access and reliable performance at scale.
Successful fertility programs depend on proactive replenishment strategies that consider source, timing, placement, and nutrient synergy. Polysulphate® offers Western Canadian growers a proven way to replenish sulphur reserves while delivering multi-nutrient value that supports yield, efficiency, and long-term soil health heading into 2026.
