The couple had won flights on a propeller driven plane, so Mr Davies took the opportunity to propose with a difference.
Diana was surprised but pleased, and accepted the proposal.
Mr Davies said: “I was a little anxious spraying off a good crop of wheat but I think it was worth it!”
Is your spouse crazy about spuds?
New website Mystery Potato will send a potato, with a personalised message, to your friend, partner or other, for about £5.
You can simply choose your potato (sweet or jacket) and provide your personal message and your potato will be sent anonymously to the recipient.
The potatoes are grown in Washington and purchased from farmers markets according to the Mystery Potato website.
It costs from $7.99 (£5.40) to mail a potato and they can ship internationally.
Last summer, agricultural contractor Alex Burrows proposed to his girlfriend in the cattle ring at Ashbourne Show.
Mr Burrows led his champion Jersey cow around the ring while it wore a red banner reading 'Will You Marry Me'.
Girlfriend, Jo Stubbs said she had no idea Alex was going to pop the question.
"I just cried. I was in complete shock, I had no idea it was coming whatsoever."
If you're not into all the smushy, romantic, teddy bear cards, why not have a look at these by Modern Farmer.
Drawn by Roxanne Palmer, these farming themed valentines cards are sure to moo-ve ewe!
If you're struggling to find love out in the field, why not sign up to Farmers Guardian Rural Partners?
The online dating site specialises in people who have a love for the countryside and has its own page in Farmers Guardian Classified every week.
It's free to sign up and you can start contacting like minded people straight away.