I grow tomatoes in Earthbox containers and use it almost weekly during my long growing season. It is a water soluable nonorganic source of calcium and nitrogen. At two tomato plants per Earthbox, I typically add a teaspoon down the watering tube once weekly from plant out.

At planting time, I will include 2 cups dolomite lime and a cup to a cup and a half of 10-10-10 fert.