Fresh manure can "burn" veg seedlings. I would always let it rot down either in a heap, covered up with thick black plastic or a tarpaulin to keep out the rain, or in with compost, where it is an excellent "accelerator". You'll know when it's ready because there will be no smell and it will be crumbly. I'm trying to think what veg you would plant so late in the year, as different things need different feeding regimes.