Furthermore, the development of sub-soilers to break up soil pans (highly compacted layers of soil interfering with water movement and deep crop root development) would not have been possible without the power capability of the modern tractor. Likewise, the ability to improve soil drainage (in excessively high moisture soils) through tractorized mole drainage systems would not have been possible with animal power alone.
European farmers did not adopt reaper-binders until the first decade of the twentieth century (Bogart 1942). In Japan reaper-binders had a perceptible impact only after 1967, almost a hundred years after the United States and a good thirty years after Japan started mechanizing pumping, threshing, and winnowing in earnest.

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Furthermore, the development of sub-soilers to break up soil pans (highly compacted layers of soil interfering with water movement and deep crop root development) would not have been possible without the power capability of the modern tractor. Likewise, the ability to improve soil drainage (in excessively high moisture soils) through tractorized mole drainage systems would not have been possible with animal power alone.
European farmers did not adopt reaper-binders until the first decade of the twentieth century (Bogart 1942). In Japan reaper-binders had a perceptible impact only after 1967, almost a hundred years after the United States and a good thirty years after Japan started mechanizing pumping, threshing, and winnowing in earnest.

Source 1 | Source 2 | Source 3

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