When we talk about potato nutrition, it isn’t just about nitrogen, phosphorus, and potassium. Season after season, I see some of the biggest gains coming from secondary nutrients — especially sulfur, calcium, and magnesium. These play a critical role in nutrient uptake, tuber development, and marketable quality.
- Diversify Sources! Beyond traditional NPKs, Polysulphate® delivers sulfate sulfur, potassium, calcium, and magnesium in one low-salt granule. Its gradual release feeds the crop in sync with demand, reducing early-season loss, salt stress, and issues like hollow heart or uneven sizing.
It also checks stewardship boxes: sustainably mined with a low-carbon, zero-chemical process, and OMRI Listed for organic use. Low chloride and low salt index make it safe for sensitive soils and high-value acres.
- Look for Field-Proven Performance
Potatoes have shown some of the most consistent responses to Polysulphate across ICL’s North American field trials. Over four growing seasons in Minnesota, Michigan, North Carolina, Manitoba, and Prince Edward Island, trials showed total yield increases ranging from 4.3% in Manitoba to 77% in North Carolina compared to controls. Beyond yield, trends included:
- increased nitrogen-use efficiency
- reduced hollow heart
- better fry quality
- Maximize Uptake by Optimizing Nutrient Synergy. When supplied all together, in sulfate form, the Ca and Mg in Polysulphate work tandem with K and S to support healthy root systems, sustained nutrient uptake, and the consistent quality buyers look for. Calcium strengthens tuber structure and reduces internal browning. Magnesium drives photosynthesis and starch formation — two big levers for yield and quality. Supplying both in a balanced form supports uniform development all season.
Bottom Line
Potato margins depend on efficiency. By going beyond NPK and focusing on balanced nutrition, growers can capture more marketable yield and value per acre.
Learn more at icl-growingsolutions.us.
— By Dr. AJ Foster, North American Agronomy Lead, ICL Growing Solutions
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