>Heavier iron ploughs mean more effective exploitation of land
Now I'm woefully ignorant of real world metallurgy, but I don't see how iron plows would be significantly better than bronze (on Earth or Glorantha). Presumably your traction (oxen for most Orlanthi) isn't powerful enough to severely dent the plow when you hit a stone. In Glorantha, iron is prohibitively expensive, and in fact it's _lighter_ than bronze. On Earth, iron is cheaper than bronze, which is the reason to use it.
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