I saw a guide for growing red clover that said that seed production was increased with honey bees involved and gave recommendations for how many hives per acre.
I could not find the paper but just thought I would throw in this 1932 paper instead.
https://dspace.library.colostate.edu/bitstream/handle/10217/5073/COAB_21797296.pdf;sequence=1
Cheers
gww
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