When tomato leaves begin yellowing or dropping blossoms, it makes sense to immediately suspect a disease or a watering issue. But often, the problem isn't a lack of nutrients in the dirt, it is an invisible chemical barrier preventing the plant from absorbing them.
Tomatoes thrive in slightly acidic soil, and if your pH drifts too far out of range, root systems lock up. You don't need to wait days for a digital meter or laboratory mail-in kit to figure out if your soil is off.
