Agricultural Sulphur

Q1

Normal sulfur is just, normal sulfur.
As for agricultural, it would be either high purity sulfur (flowers of sulfur, like you buy at gardening stores), or something similar to 'rose dust', which has additives mixed with it, although i don't know for what purpose (besides being specific to roses).

Just look for 'flowers of sulfur' or 'elemental sulfur' both are about 99.9% pure, which is generally good enough.

Thanks cyclonite4

Yeah, about that :)

Well I'd like to help, but im gonna admit now, I havent really explored much into the second of those 2 reactions, but i'm sure there is a way of controlling them

"Agricultural" grade sulfur would be "technical" grade sulfur, produced with a minimum of purification steps, if any, after being either mined from volcanic fumaroles, or extracted from deep deposits in sedimentary rocks (as in Texas) through drillholes by the Frasch process in which it is melted with superheated steam and pumped out. It would either be applied as the element in S-deficient areas, or burned to produced SO2 then catalytically converted to SO3 to produce sulfuric acid for chemical manufacturing especially of "superphosphate" fertilizer. The most likely impurity would be Se, but this is not a problem for agricultural use because S-deficient soils are usually also Se-deficient.

Analytical and reagent and medicinal grade sulfur, used e.g. for making thiosulfate and to treat certain fungal and other medical conditions, would have undergone at least one further purification step, most likely by sublimation (to produce "flowers of sulfur", although dissolution in CS2 is another possibility.