Mag, phos and potassium defs. Not nute burns. Roots organic nutes will always leave you with defs. The dry nutes you have to use 3 times what the directions say. If you want all in one nutes. Dr. Earth tomato and vegetable are pretty good. The amount of npk doesn't mean anything. Less is more. Alot of companies put way too much phos and potassium causing abuse to the plants. Its about a balance of minerals. Nute burns will start with reddish tips than advance along the edges moving inward.
I myself topdress down to earth vegan mix, kelp meal, neem meal, rock dust, and worm castings