I dig a deep hole, so that only the top 3-4 pairs of leaves wlll be above ground. Then I put a big handful (small hands) of alfalfa pellets into the hole and sprinkle soil over them. Tomato plant goes in next, backfilled with garden soil and sometimes some homemade compost. Near the top I sprinkle a spoonful of a humic acid product
https://www.johnandbobs.com/buy/opti...oil-optimizer/
and cover with soil and then aged wood-chip mulch.
If I have enough, and I have time to do it, I top-dress with a few handfuls of homemade compost per plant later in the season.