In an e-letter I received from AgProffesional.com  there is a good article on alfalfa response to sulfur. Trials conducted by Iowa State are confirming what Calcium Products' customers have always known.

This summer we will be teaming with Dr. Sawyer, and Extension Agronomist Mark Wuebker to continue their sulfur research on corn. http://blog.calciumproducts.com/posts/iowa-state-sulfur-research.cfm

"We are excited at Calcium Products to team with Dr. Sawyer and his staff." stated Larry Moore, President of Calcium Products. "It will be of great importance to Iowa farmers to finally quantify the impact of sulfur on production. I have seen a yield increase from sulfur on the farms I own and for many of our customers, SuperCal SO4 is the last thing they would cut from their fertility programs in tight years."

SuperCal SO4 is high quality natural gypsum finely crushed then pelletized. It contains 17% sulfur and is one the least costly sulfur products on the market today.

Additional Information

Sulfur is a structural component of amino acids, proteins, vitamins and enzymes and is essential to produce chlorophyll. It imparts flavor to many vegetables. Deficiencies show as light green leaves. Sulfur is readily lost by leaching from soils and should be applied with a nutrient formula. Some water supplies may contain Sulfur. For more information of the 20 other important crop nutrients click here.

Past blog post on sulfur and Iowa State