Kat2

Technically top dressing refers to adding nutrition to the top layer of soil around the plant. Dirt alone does nothing for the plant unless there's a sizable depression. (This can happen when you dig a huge hole then don't pack dirt around the plant when transplanting (not heavy packing but good firming) or don't water it in.) Even so you should add compost, well rotted manure or wood mulch which give more goodies to the plant than just plain dirt. Eh, dirt if you life on the east coast of FL is sand so I only use mulch or compost since I have yet to find a source of manure here.

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