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NE Iowa | Most of the elemental S on the market is finely ground to help breakdown and then 10% bentonite clay is added to turn it back in to a prill that spreads well with other fertilizer. From what I've gathered from research the elemental particles will vary in size from 50-300 mesh. I think they purposely have a range in order to spread out the oxidation to sulfate form. Several of the products advertise that at least 50% of the particles will be 100 mesh or smaller. So based on the table below that I found with a 100 mesh particle at 2 weeks 36% would be oxidized and at 4 weeks 68% would be oxidized. But remember only 50% of the particles are that small. I think elemental S got a bad rap in the past when it was coarsely ground. The newer products that are finely ground and then bound together with clay make a nice slow release product. I've gone to using elemental S every year. I can get 90% elemental S for $580 per ton which is $.32 / # of S.
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Elementary Sulfer break down ?
