Quote:
Originally Posted by mobiledynamics
SW -
Ferts, if not the chems from city water. I make it a point to flush my points, but sometimes a pot of two will get a hard crust
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Even more fast is the pH change of used fertilizer solution. Tomatoes can tolerate quite high salt index compared to other plants, but runoff pH changes can happen rapidly in fast growing conditions depending on the fertilizer content. Overhead watering when using chemical ferts is a must.