Potassium Sulphate contain one of very important macro nutrients for healthy plant grow. They are know as macro nutrients because plants uptake for those nutrients is much more then trace (micro) nutrients.
Potassium (P) is one of the most important macro nutrients for plants grow.
Potassium deficiency symptoms
Pin-holes form in leaf that enlarge with a yellowing edge.
Plants requirements for healthy grow
Carbon (supplied as Carbon Dioxide CO2)
Trace elements (micro nutrients)
Store in a cool, dark place