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I won't claim to be an expert, so I might be out of line here and should let others handle this. Could the decay process be accelerated by regular tilling? I' know Vavuniya, and at this time of year the area is dry and hot. The rains shouldn't resume until late September or so. If the area was tilled to 8-12 inches every week or so, would that enhance the decay process?
This is an agricultural area, so there should be plenty of equipment available to do the work. Are there any biological supplements (could you inoculate with a digestive bacteria?) or fertilizers that might also accelerate digestion? At this time of year, they might actually make some of Tim's temperatures for a week or a month, too. It's predominantly flat, hot, dry and exposed, or at least it was when I worked there.