Tomatoes need calcium to achieve their full flavor potential. When planting tomato plants crush up (to powder) about 4 or 5 egg shells and put them in the bottom of the hole. Then plant tomato on top. They'll provide calcium and prevent blossom end rot.
using a 5 gal bucket drill holes around bottom rim and up from bottom rim. Place 2 shovel scoops of compost into bucket and bury into ground just below drill holes. Plant 2 tomato plants around bucket and fill with water twice per week.