A loamy tomato soil includes a combination of silt and sand with a small portion of clay. Each of these elements is added for a reason. The soil can compact easily because of the silt, which acts as sediment. Also, the manufacturers include sand to promote aeration and optimize drainage. The addition of clay guarantees the plant will have sufficient nutrients. It also helps to combine sand and silt. Remember that you should ensure there is an approximately equal amount of silt and sand, and they should make most of the potting mix. That secures the ideal component balance to promote tomato growth.