Hawk, beet recipe - about a 3rd of each of the main ingredients we work from. 1/3 vinegar, 1/3 water, 1/3 sugar. I prefer less sugar so we make some with less. Some folk use pickling spice in them, cheap as chips if you fancy trying a jar of those too - prob work better with onions imo.
Manure is good **** (lol), but not for all veggies. There's some vegetables that actively don't like too much manure. But no, I don't use it as much as I should esp as easy to get. I tend to forget about it and then it's all been taken by others.
Sorry about your corn, weird stuff. I get small ears of corn on the same plant as the main cob, but these are just offshoots, kind of thing, and not really to be used. I can't think what would cause that? I don't mulch anything, but water a lot and every day over my whole allotment.
Anyway, so this year as well as a lot of weeds I've grown wallies, corn, carrots, mini cucumber, radishes, beetroots, king Edward spuds, charlottes, too many tomatoes, runner beans, French beans, marrow, melon (didn't work, no fruit), leeks, peas, onions (pulled up onions with rot), a strange red, leafy veg that someone else gave me on the plot (used in Indian cooking, yum) and extra flowers for the bees

Oh and of course fruit, but that looks after itself. Raspberries, strawberries, loganberries and black currants.
The last pic is how not to do veg growing, a crime to allotment dwellers! This spring it all kicked off at home with partners dad's illness so I had little time to get to the allotment to plant my plants. It was a case in the end of running over in a spare 30 mins, digging a patch and planting seedlings out, not caring about planning, just wanting stuff in.
So even tho the plot is scruffy this year, I am pleased to say that it's growing very well - eaten too many beans already and have so many courgettes/marrows that I now leave em outside with a note for neighbours to help themselves. They do go tho!