This is a post by Peter Sutton on PTC site.
You don’t need a CAD software blog to tell you that tractors bring much needed torque and traction to farm fields. With these powerful machines, you can plow, till, seed, and harvest vast acreages of crops with relatively little effort. Not surprisingly, tractors have more than doubled farm productivity since being widely adopted in the US in the 1920s.
But here’s something you might not know: A significant amount of farming still takes place without any tractors at all. The machines are simply too expensive to buy and maintain for many agricultural families, especially for those with limited acreage. Take India.