Here a link.

Here is a link that might be useful: Its high with shipping on line

Agricultural sulfur is used by conventional farmers, here in the Midwest, for growing alfalfa. I guess alfalfa, and possibly soybeans, as well, pulls sulfur from the soil, and after many years of cropping, the soil is depleted. I bought a 50 lb bag of agricultural sulfur for around 40 dollars, two years ago. I had to go to a farmer's feed 'n seed co-op to find it.

Ammonium sulfate should be at local garden centers.

Alfalfa needs lime in WI, not sulfur. Not significant just the facts. Nothing like the smell of freshly cut alfalfa. Cutting it down was one of my summer jobs.

Here is a link that might be useful: pH and lime vs alfalfa yield

More detail than some will appreciate, but also a clue on how to find sulfur at a good price. The article fruitnut has linked to clearly states that sulfur can be deficient in fields used to grow alfalfa, and that improved yield will be had when sulfur is applied. Several years ago, when I was trying to find an economic source of sulfur, to lower soil pH around our blueberry shrubs, I was obliged to do some rather extensive research. I learned that farmers in northeast Iowa were seeing problems with corn and soybeans that they could not address with conventional fertilizer. Analysis of the crop was done, and a sulfur deficiency was found. This was around 1975. Since then, agricultural sulfur has become more widely available here in the midwest, where it is often applied to fields used for growing alfalfa, corn, and soybeans. This is NOT being done to lower soil pH-rather, sulfur is applied because the plants need sulfur, as a nutrient. Why is this important to those of us who grow blueberries? Its important, because farmers are buying sulfur in large quantities, and that helps keep the price low.

I'm in a different part of the nation admittedly but I could find sulfur in 20-30 lb bags at a farm and garden store and 1-5 lb bags even in a Lowes. Some is wettable powder for spraying (as a fungicide) but any type is OK for pH adjustment or S as a minor nutrient.

An ag-school professor about 15 years ago told me that they were having to add S to fertilizer recommendations because air-pollution measures on coal-fired power plants were reducing the amount of rainfall and dryfall (dust) background application of S to fields.

Try this place

http://www.cpsagu.com/Locator.aspx

Oldryder,

From previous posts, I know that you have a sizable fruit acreage. Buying fertilizer,etc "on-line" will be too heavy on freight costs. You are in Minnesota... Brainerd, MN has a feed store that supplies farmers: Bjerga Feed Store, They have 50# bags of Ammonium Sulfate for around $25 and 50# bags of garden sulfur for just a little more than that. Probably less than just the freight bill from an on-line purchase. Get out your yellow pages and look up the closest "feed store" that supplies farmers.

As a side note, all the farmers around here add ammonium sulfate to their herbicides--especially glyphosate. It supposedly increases its effectiveness.

The cheapest way to add sulfur might well be gypsum (calcium sulfate).

It would be easy to find in bulk here, but I don't know about in MN.