First time veg

Ok so i have some onions,potato,carrots.tomatoe's in my small plot in the front garden
the spuds are coming up really nice carrots seam to be doing well also the tomatoes are still small around 4 or 5 inch's i`m not hoping fow massive yeilds from my patch but it would be nice to get something even if its enough for a meal its all a learning curve

my Q is whats best to feed the spuds ? i did dig in levingtons farmyard manure and also some FBB is it needed to feed the spuds anyting else do they need it?

 

Ohthats handy i have some tomorite in the shed that`l do nicely thanks JWK