Reliable US produced fertilizer delivers calcium sulfur and better yields
As the 2026 planting season approaches, growers are focused on improving nutrient efficiency, protecting input investments, and securing reliable crop nutrition. SUL4R-PLUS® is a calcium sulfate fertilizer designed to meet these priorities with proven agronomic performance and fully U.S.-sourced production.
Backed by a domestic supply chain and expanded production capacity, including a facility in Marissa, Illinois, SUL4R-PLUS® ensures consistent availability while minimizing the risk of supply disruptions. This reliability allows growers to plan their fertility programs confidently.
SUL4R-PLUS® delivers two essential secondary nutrients: calcium and sulfur. These nutrients play a key role in plant health, nutrient uptake, and nitrogen efficiency.
Sulfur is crucial for protein formation, chlorophyll production, and nitrogen use, while calcium strengthens cell walls, supports nutrient transport, and improves stress tolerance. Each pellet also contains fulvic acid to enhance root development and nutrient absorption throughout the growing season.
Field trials and real-world grower experience show measurable yield improvements across crops. Illinois grower Gerald Forbeck reports that using SUL4R-PLUS® in wheat, corn, and soybeans led to yield increases of 8–14%, with higher protein, calcium, and sulfur levels in crops like alfalfa.
“We have a 100% U.S. production and supply chain for this crop nutrition tool,” said Ben Runge, Plant Advantage™ Marketing Manager, HELM Crop Solutions. “It’s one thing to manufacture a product in the U.S., but sourcing the raw materials here as well minimizes disruption risk and gives growers confidence that the product will be there when they need it.”
Designed for operational efficiency, the low-dust, uniform pellets allow accurate application, flexible timing, and improved storage. The fertilizer is pH-neutral with a low salt index, reducing the risk of crop injury while supporting long-term soil health.
“In 2024, we saw about an 8% yield increase in both wheat and corn, and more than a 14% increase in soybeans compared to no sulfur,” said Illinois grower and retired retailer Gerald Forbeck. “The fertilizer is a high-quality material that provides necessary nutrients and a root stimulator, without affecting soil pH.”
With global fertilizer markets volatile, SUL4R-PLUS® provides a stable, scalable solution for growers seeking higher nutrient efficiency, improved yields, and strong ROI. It is most effective when integrated into a comprehensive fertility plan, offering dependable results across varying crops and conditions.
Photo Credit: Sul4rplus-Soybean-rows