Magne-Cal + works alongside the PK to aid with the uptake of these vital elements as well as giving the plant a surge of trace elements.
As the demand for Phosphorus and Potassium increases so does the demand for Magnesium and Calcium. It is vital to have the correct ratio which Magne-Cal + has.
Magne-Cal + will also stop Magnesium and Calcium deficiencies as well as giving the plant a food source to green up the leaves.
There is just the one bottle for both the vegatative stage as well as the flowering stage.