Magnesium (Mg) is the central atom of chlorophyll, and therefore has a distinct function in the process of photosynthesis of the plant. When growing with CO2, it is important that the plant has sufficient magnesium at its disposal.
Usage: Only if growing with co2!
With a moderate shortage: 0.75 ml to 1 liter.
With a normal shortage: 1 ml to 1 liter
With a serious shortage: 2 ml to 1 liter.