I know that this question is very much vegetable-dependent, and I am aware that certain vegetables (as brassicacae in general, and root vegetables as well) do not like manure, others can be grown on a land that has been manured the previous year, etc.
My question is about the right time to apply manure. I am having 20 kg of well-rotted horse manure delivered next sunday. I already started some peas, broadbeans, chickpeas, courgette, squashes, cauliflowers, salads and herbs indoors, and I am planning to start hardening them outside during April. For the moment almost everything is in pots or seeding trays. By the end of April I am also planning to start sowing other varieties of courgette, french runner beans, tomatoes (probably in pots) and other herbs.
In my garden I have two big beds, with clayish soil (therefore not draining excellently), but full of compost and organic matter (worms really thrive in it, and I have almost no weeds at all).
1) When should I apply the manure to the soil? Is it best to do it now, then leave the soil covered (so that the sun doesn't get in and weeds do not develop, and to protect from weather) until I transplant my vegetable outside (in 1-2 months)?
1a) If I am planning to lime the soil before planting, when am I supposed to do it?
2) When people say manure is well-rotted, does that mean that it has been composted long enough to ensure it is safe to use it straight away in the garden?
3) Should I use some manure also for the soil I am going to use in the pots for tomatoes and some courgettes?
4) Which vegetables among those I have mentioned really could get in trouble because of the presence of manure?
Thanks a lot!