I was listening to the great Alison Krauss bluegrass song 'The boy who wouldn't hoe corn' and wondered why hoeing it helps against frost; apparently it's based on the 1931 song
Google books finds me: which is from the 'Western farmer' from 1839 and has an article by a West Hallowell saying how he found that hoeing the ground made it absorb heat and meant the plants didn't get frosty compared to neighbouring plants!

I love it when you can learn things from a song. Same thing with movies.

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