pot ash

P...phosphorus 

get a rope

I always use Potassium Sulfate instead. here's why ...

REDUCED CHLORIDES

Chloride makes up a significant component of MOP. While this is preferable for some crops, it can be damaging to others that are sensitive to chlorides, such as some fruits, vegetables, and nuts. Many chloride-sensitive crops fall into the high-value category, so optimizing quality and yield are especially critical.

Additionally, if MOP is added to soils already rich in chlorides, toxicity can occur. When working with chloride-sensitive crops or chloride-rich soils, SOP provides an optimal solution, as it is substantially lower in chlorides.

ADDED SULFUR

In addition to potassium, potassium sulfate also provides plant-available sulfur. Sulfur deficiencies have become increasingly common in recent years, making products that include the secondary nutrient increasingly desirable.

LOWER SALINITY

Potassium sulfate has a lower salt index than most potash fertilizers, making it the preferred choice when soil salinity is a concern.