Skytrooper said:Thanks for the reply. The area is approx. 2000 ft2. The local co-op told me 2lbs per 100 ft2. I was in a hurry the day i did it last spring and spread the whole 50 lb bag on it then roto tilled it in. I had some fine looking little plants that I had started inside. I planted them and they turned yellow and layed down within within a couple days. I was hammered on time and just figured that the season was over so went on. I was told that only time would settle out the sulfur, that bein' said tried again this spring and it hasn't killed the plants yet but they aren't kickin' off like they should. I got on this site looking for any and all advice on what I could do.
Thanks
You spread and tilled it in last spring, and the plants were unhappy this summer? Was that "last spring, around 3 months ago"?
Or was it "LAST spring, around 15 months ago"?
Or did you put down 50 pounds LAST spring (15 months ago) plus another 40 or 50 pounds THIS spring?
I ask because it is supposed to take a lot of time (more than just one year) for elemental Sulfur to be converted by soil bacteria into sulfuric acid, which is the only way it can lower pH. (My guess is that Sulfur "pellets" are still finely ground Sulfur, just powder glued together somehow into granules. Thus I would expect it to break down almost as fast as finely powdered "flowers of Sulfur".
But not in just 3 months! Especially if your soil is heavy clay. Heavy clay is a good buffer for mineral ions and also pH. It takes around 3 times as much lime (or Sulfur) to change the pH of clay soil, as sandy soil.
So I would look for some other problem than just too much acid. If 40 pounds was an average dose for normal soil, I would expect clay soil to accept twice that much without getting TOO acid.
Assuming it was too basic to begin with.
If it was already acid enough, and you've added 1-2 doses of Sulfur, now it is TOO acid, and will be getting more acid for the next few years, as the soil bacteria convert S and H2O to H2SO4. Add lime.
But first, check the pH! If you have been fixing a problem that you don't have, you ARE creating other problems.