MAGNESIUM AND SULFUR BOOST
Magnesium deficiency is the MOST common cause of poor yields besides overfeeding. The primary symptom of Magnesium deficiency is premature yellowing or interveinal fading of leaves. Sulfur deficiency is characterized by the fading of the veins. Once yellowing is visible, CO2 consumption has slowed. That affects flower development.
The most common cause of Magnesium deficiency is the high Potassium/Phosphorus levels of bloom boosters.
A secondary cause is overfeeding Calcium.
CAL-MAG IS NOT THE ANSWER
No Cal-Mag product on the market contains sulfur
Magnesium and Sulfur deficiencies almost always occur together
Chlorophyll formation requires BOTH Magnesium and Sulfur
Excess calcium can cause magnesium/sulfur deficiency
Soil/Hydro: Use 1 tsp (5ml) per gallon of water throughout the flower cycle.