Potatoes need about an inch of rainfall per week to grow at their optimum. During the extreme heat of summer, they can use 3 to 4 times that amount. That translates to watering them every second or third day during the worst of the heat.
Soil preparation is much more important with spuds. They like soil just a bit on the acid side. Good tomato soils run about 6.0 ph and they will grow pretty well down to 5.5 if the soil fertility is high.
Fusion
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