On Sunday, January 12, 2014 9:47:10 AM UTC-6, Ralph Mowery wrote:

Sulfur is necessary. It is not just a byproduct that is put in the fertlizer for filler. http://www.soil.ncsu.edu/publication.../AG-439-15.pdf


True, it is necessary in some amounts. But when soil tests show a pH of 6.0 or less, adding sulfur is not necessary for most plants. (Blueberries & azaleas excepted). A thick subsoil can retain sulfur and cause problems if more is added. Which was my point. Cotton fields in the South fertilized steadily over decades are in very poor condition because of component buildup.