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Stump-jump plough
The stump-jump plough is a kind of plough invented in South Australia in the late 19th century by Richard Bowyer Smith to solve the particular problem of preparing mallee lands for cultivation.
==The problem==
Mallee scrub originally covered large parts of southern Australia, and when farmers moved into these areas they found it peculiarly difficult to clear the land. After the trees were cut down, the roots energetically produced regrowth. These young shoots and the old roots could be killed by repeated burning (see below), but the large roots remained in the ground, making it impossible to plough the soil. Grubbing the roots out was a slow and labour-intensive activity, and the problem was seriously hindering agricultural expansion.
In South Australia, land was being offered under the ''Scrub Act'' of 1866 to farmers on lease, with the option of purchasing after 21 years at the price of £1 per acre. However, grubbing the scrublands was proving costly, at approximately £2 per acre, and solutions to the problem were desperately sought.
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