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In page Scottish Agricultural Revolution:
"Improvement continued in the nineteenth century. Innovations included the first working reaping machine, developed by Patrick Bell in 1828. His rival James Smith turned to improving sub-soil drainage and developed a method of ploughing that could break up the subsoil barrier without disturbing the topsoil. Previously unworkable low-lying carselands could now be brought into arable production and the result was the even Lowland landscape that still predominates.[1]
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