can i use peat pots to grow seedlings of root vegetables

i use them for vegetables and i also use cell inserts and it works for me

welcome to GoY and yes you can use peat pots. when plant is big enough to go out bury the pot as well. it will rot down over the season.

Root crops like carrots and parsnips produce a long tap root very early on so growing into any kind of pot is very difficult. Beetroot, stump carrots etc are different.
I've tried successfully germinating parsnips and carrots into vermiculite in modules but planting them out into the garden at the earliest opportunity. This has worked well. If you sow into a peat or soil compost you run the risk of breaking the tap root and producing a crop with forked or distorted roots.