Maximize Soil Fertility

Powerful Results & Committed Customer Support

At Calcium Products, we help customers maximize soil fertility to achieve higher crop yields by offering the highest quality calcium-based fertilizers on the market. With a focus on strong customer relationships, continuous improvement, and leveraging technology, we strive to help our customers reach their full potential.

Our products, 98G pelletized limestone and SO4 pelletized gypsum, are manufactured in Iowa, atop some of the purest limestone and gypsum deposits in the world. Though a majority of our product is used in the agriculture industry, we also manufacture smaller grade sizes for the professional turf industry.

98G is pelletized limestone – the most effective and consistent product to correct and maintain soil pH.

SO4 is pelletized gypsum – the superior sulfur source that delivers the right amount of sulfur, perfectly matching plant needs.

Correct & Maintain Soil pH With 98G

Are you making soil pH a priority in your fertility program? Soil pH is critical to healthy plant growth and works as a master variable in the soil, governing chemical and biological processes. Don’t just correct your pH when you soil test, maintain it at a level to maximize your yield every year.

Increase Your Crop Yield With SO4

SO4 supplies a strong initial release of sulfur followed by a steady supply throughout the growing season, perfectly matching plant needs. Averaged over 67 trials across the Midwest, SO4 increases corn yield by 15.4 bushels/acre compared to no sulfur.

Meet the Calcium Products Team

From a highly experienced executive team to our skilled territory sales managers and everyone in between, we are committed to providing our customers with the products, information, and support they need to be successful.

Locate a Dealer Near You

With an ever-expanding list of capable dealers spread across the United States, find your nearest Calcium Products dealer to learn more about how our products can work for you.

Grow Your Soil Fertility Knowledge

Address Soil pH This Spring With 98G

Education Choose 98G for your spring pH managementWhen inclement weather shrinks the fall fertilizer application window, liming applications are often skipped. Therefore, soil pH remains sub-optimal and dollars invested in nutrient management can be wasted due to...

Thicker, Greener Alfalfa with 98G Pelletized Limestone

Education Growing vibrant alfalfa that wants to pop out of the ground Wisconsin farmer, Dan Toay, shares his experience testing 98G to improve his alfalfa stands. “The fields that had the 98G were heads and shoulders above the ones that had not,” says Toay. “We...

Sodic Soils in a Nut Shell

Education What is sodic soil? It is important to first define what a sodic (alkali) soil is: a soil with a high exchangeable sodium percentage (ESP). What this percentage is will differ in regions of the United States depending on precipitation patterns and water...

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