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The biggest change in farm machinery is in computerisation. The gear my mate drives 'learns' fields by gps, ensures no overlap of spray and calculates spray dosage by yield. The combines calculate yield by acre and moisture content of the grain plus a million things I have forgotten. Modern kit is all air conditioned and has suspension seats that are more comfortable than the average sofa. The little shit reminds me of those details every time the temperature rises above 30.
It's been a while for me, but I was of the impression that combine harvesters used to consist of different functions bolted together. Consequently they looked quite skeletal. Now they are designed from scratch, so everything is integrated under one shell - so it looks a lot bigger. The amount of gubbins beneath hasn't changed through? Would be interested to know the thinking behind the half-track.