Can I put courgettes where parsnips currently are?

We inherited some parsnips which were past their best when we got the plot but decided to keep them in as a bit of weed cover.  They are starting to go to seed now so I want to get them out.  We have some lovely young courgette plants.  Are there any problems with courgettes going where the parsnips have been?  Should I manure before they go in?

The other plants we have waiting for a space when this lovely weather decides to stay put are tomatoes, squash, dwarf french beans, and various flowers

Thank you

I'd get them in asap, as they are well into spring/summer growing now!

Courgettes are a different strain, and will probably succeed, maybe also if you can feed them with a little bone meal, or 6X.