From Treehugger:
The plough was a pretty major breakthrough in the history of humankind
and allowed people to grow crops in soils too hard for hand digging and
to greatly expand their fields. Early ploughs were, more or less, a
pointy stick dragged behind a draft animal, cutting lightly through the
soil. A farmer would walk along with the plough and lift the plough
blade so that it didn't get caught on rocks or roots. These ploughs were
fine for lighter soils but had trouble in harder soils.
Enter the heavy plough, which uses wheels to support a heavier plough
blade. The exact place and time of the first use of the heavy plough are
not inconvertible known, but it's safe to peg its introduction to
somewhere in Asia around 200 A.D. The Romans were rocking the heavy
plough not too long after that, and by roughly 600 AD, the rest of
Europe was on board. Farmers were able to open up extensive new fields
thanks to the heavy plough, boosting crop yields and population numbers
(aka all of our distant relatives). (
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