Manure! After having the whole plot dug over and weeded in the last few afternoons, I have sowed green manure ( rye grass & trefoil/Clover) in all the empty space left after harvest to improve and maintain plot seven's soil.
I hope that they will be forming a green carpet that stops weeds colonising and prevent nutrients from being washed away.
Last season I had cast some green manure in the vacant bed and I am well impressed in the improvement in soil quality. So fingers crossed.