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 https://tunearch.org/wiki/Annotation:Lazy_Farmer_Boy_(A)
Google books finds me: https://books.google.co.uk/books?id=ww4kAQAAMAAJ&lpg=PA52&ots=mcsm495cmr&dq=hoeing%20corn%20frost&pg=PA52#v=onepage&q=hoeing%20corn%20frost&f=false 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.
@penguin42 such a great song. thanks for the info!
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