CFB yellowing leaves

Beans do an awful lot of work in a very short space of time and exhaust the nutrients in the ground, quickly. I trench my beans to help alleviate this but, will still feed them with nettle and comfrey tea about twice a week through the summer to give them lots of extra vigour.

That's interesting - I water if it is really dry/hot, but never feed becaue I though the nitrogen fixing capacity of the plant made it not necessary. They get loads of compost on the bed before planting and then are mulched.
Something to try for next year!