Soil Solutions, LLC began their operations in May, 2002, and are owned by Dale Ronfeldt and Bob Hecht, who cumulatively have over 80 years experience in the agronomy field.

Based in Onawa, Iowa, our two main products, PRO CAL 40 and Nutra Bio, are managed and marketed from Purac/Corbion in Blair, NE.

As owners of Soil Solutions, Dale and Bob recognized that there was a demand for calcium sulfate for improved crop production and soil management. They also recognized that most calcium sulfate mines were not marketing to the agricultural producers.

  • Soil Solutions LLC Plant
  • Salesman Gene standing in our soybean field. They yielded 100bu./A
  • Two floaters
  • Shafferts on Kinze Planter
  • Mike soil sampling
  • Field Day
  • Field Day
  • Pile of Gypsum
  • Peterbilt Trucks



“Granulized calcium sulfate has been widely used in crop production, but is not cost effective in those soils that require high rates. Our products provide those producers a very cost effective product within our marketing area.”


PRO CAL 40 is calcium sulfate di-hydrate (gypsum) that is produced as a result of the production of lactic acid from the sugars of corn through a fermentation process. We market this product mostly within 250 miles of the production facility. Annual production continues to increase and most of this product is soil applied. Uses include reclamation of sodium affected soils, improvement of gumbo or heavy clay soils, a means to improve infiltration and reduce sealing of soil surfaces plus an economical source of calcium and sulfur. Yield benefits have been realized in alfalfa, corn, soybeans, wheat and potatoes. Other uses include as a drying agent during the composting of manure, synergistic benefits with manure applications and decreasing phosphorus runoff from fields where high levels of phosphorus occur.

Nutra Bio is the other product that Soil Solutions markets from Purac/Corbion. It also has soil amendment qualities improving soil structure and providing some liming benefits. It has value as a source of nitrogen, phosphorus, sulfur, calcium and some micronutrients.

While we prefer to market through retail dealers, Soil Solutions also has the ability to provide trucking of the product to the field as well as provide application of the material to your customers’ fields.

Contact Us with any questions!