June 06, 2020, 11:00:15 AM
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Topic: Lime sulfur or Calcium polysulfide production for organic farming  (Read 3649 times)

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Offline Francis4344

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Hello everyone!

I am an organic apple grower and I need a fairly large amount of Lime Sulfur in the course of a growing year. The pesticide grade Lime sulfur is very expensive and I would like to make my own.

I did a trial this year using this "recipe"

100 kg of water
20 kg of sulfur (micronized - pesticide grade)
10 kg of Lime (hydrated lime, not quick lime)

Altough I had some success, I also got quite a bit of deposits, signaling an incomplete reaction. The resulting product was not as concentrated as the commercial version.

Is there a method, or a catalyst, that would improve this simple process?

Please note that to make things more fun, any other products used will have to be approved by OMRI, so we are looking at old fashion products here...

Thanks for your interest!

Francis

Offline Arkcon

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Re: Lime sulfur or Calcium polysulfide production for organic farming
« Reply #1 on: June 11, 2013, 04:01:35 PM »
Use quick lime. Use more sulfur. See recipe here: http://en.wikipedia.org/wiki/Lime_sulfur  Granted they still use lbs in that recipe.  But they give the ratio: 2.25 sulfur to 1 quicklime by weight. A little bit of surfactant is needed.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Francis4344

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Re: Lime sulfur or Calcium polysulfide production for organic farming
« Reply #2 on: June 13, 2013, 09:01:51 AM »
Thanks for the reply. I was aware of that Wikipedia entry.

Since I am getting a residue (mostly unreacted lime by the look of it), you may be right about using more sulfur. Maybe quick lime would make a difference altough once thrown into water it becomes hydrated lime anyway but the reaction might improve the calcium dilution in the water.

So, no catalyst suggestion? Does anyone have a suggestion on the "cooking" method? Should I boil the sulfur-water mix first then add the lime? Or do the lime-water solution before adding the sulfur?

Same difference?

Thanks again!


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