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
Education Get the next few bushels from your soybean cropA compilation of 30 trials shows SO4 pelletized gypsum yields an extra 3.3 bu/A vs no sulfur on soybeans. The average application rate was 100 lbs/A including spring pre-plant and early summer topdress...
Education Comparing efficiency of pH change among liming productsRecent Iowa State University research compared the efficiency of soil pH change among 98G pelletized limestone, a calcitic aglime and a dolomitic aglime typical of what is found in Iowa. Watch the video...
Education Sulfur + soil qualitySO4 pelletized gypsum is a great sulfur fertilizer, but many farmers and agronomists are familiar with gypsum for its soil amending benefits. The calcium in SO4 displaces sodium in soils, which in turn helps with water infiltration and...