Morning, yes they can be used for cereals, however, it would be dependant on conditions and what you're drilling into. If you are able to give us a call on 01778 591225 I'd be pleased to talk this through with you? I should also be able to put you in contact with a current user in your direction you could speak to?
Arron | Agri-linc
My unidrill is 18 row over 2.4m.
I use it for 70 acres cereals per year no bother at all.
Also about the same of grasseeds and some years kale and/or forage rape too.
Its an old one with the Sulky box, circa 97 or 98.