Calcium Products - Iowa soil short of nutrients after all
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Iowa soil short of nutrients after all

For years our customers have told us that they are growing better corn and beans than ever with our products. Was it the calcium or the sulfur, or something else? For years Iowa State has told us that Iowa soils have enough calcium and sulfur, well calcium anyway. In the newest research they have found corn does respond to applied sulfur, 82% of the time.

Summary from: Evaluation of Corn Response to Sulfur Fertilization in Northeast Iowa, John Sawyer

Corn grain yield increase to S fertilization has occurred with high frequency in these studies. Also, the magnitude of yield increase has been large. Across the two years and three studies, 82% of the sites had a statistically significant yield increase to applied S fertilizer. By study, statistically significant across-site yield increases averaged 15, 18, and 38 bu/acre. Analyzed across S rate, the economic optimum S rate was 14 lb S/acre for fine-textured soils and 24 lb S/acre for coarse-textured soils. This research indicates a dramatic change in need for S fertilization in northeast Iowa, and that S application is an economically viable fertilization practice on many soils.

Read the whole article here.

In case you've never used sulfur products their price is rising along with other inputs. Many dealers have reported not being able to source enough sulfur. Fortunately since SuperCal SO4 is made in Iowa from a natural mined source, its price has not risen as dramatically as other sulfur products. In fact using SuperCal SO4 in bulk at the universities recommendations will cost you $7.50 to $10.50 per acre, quite a bit cheaper than other products on the market.

While we have been sold out for over a year we have just finished our plant expansion and should be able to meet demand for the coming years. As an added bonus, SuperCal SO4 doesn’t cause soil acidity like ammonium sulfate, thiosulfate, or elemental sulfur does. Though we do sell lime is you want to add more cost to your fertilizer bill!



The Blogronomist is maintained by Craig Dick, head blogronomist and VP of Sales and Marketing. Here you will find a wide array of blog articles from Craig and expert guests on topics related to soil and crop health, farming, and so much more. If it’s not here, ask us!

Additional Info

  • Article Reference:: Calcium Products, Inc.
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