Humboldt County’s Own MagnumMagnesium/Sulfur Supplement with Vitamin B1.Photosynthesis is the process whereby the chlorophyll in the leaves converts sunshine and CO2 into sugars. It is the basis of ALL plant growth. The diagram shows a typical chlorophyll molecule. Note the Magnesium atom (Mg) at the very center. No Magnesium, no chlorophyll, no photosynthesis.Magnesium supplements are probably the least “sexy” product in the hydroponic market yet Magnesium deficiency is the most common cause of poor yields besides overfeeding plants. That’s why we loaded up our Deep Fusion Series with Magnesium and for most growers the Deep Fusion Series will supply enough magnesium to prevent deficiencies. However, some varieties have a greater demand so supplementation may be necessary. For high value crops, many growers will use Magnum as insurance.If you’re not using our Deep Fusion Series then you almost certainly need a Magnesium supplement.Magnum is our high potency Magnesium/Sulfur boost with vitamin B1. The Magnesium guarantees an ample supply for chlorophyll synthesis and the B1 helps mitigate the stress caused by high performance bloom regimens. Works well with all popular base nutrients.The most common cause of Magnesium deficiency is the high Potassium levels of bloom boosters. Growers use a high PK boost for maximum flower development so a Magnesium deficiency is always a potential threat.The primary symptom of Magnesium deficiency is premature yellowing or interveinal fading of leaves.By the time yellowing is visible, flower development has already been affected and CO2 consumption, which depends on chlorophyll, has slowed. That affects the whole plant.If you are using Deep Breath to increase CO 2 uptake, or you are using CO 2 enrichment, the accelerated growth rate you expect to see will not happen if you have a Magnesium deficiency. Plants grown under normal CO 2 will be even more impaired.Why CAL-MAG is not the answer. A lot of Cal-Mags are loaded with nitrogen (check the label) so you’re adding a “grow” nutrient right in the middle of bloom!Excess Calcium can cause a Magnesium deficiency. Using a Cal-Mag to treat a Magnesium deficiency is like mixing poison with the cure because Calcium and Magnesium are transported through the plant by similar pathways, so excess Calcium can actually block Magnesium transport! Remember, the Micro part of all 3 part base nutrients is loaded with Calcium. Adding a Cal-Mag can lead to problems because the higher the ratio of Calcium to Magnesium the more the transport of Magnesium is impaired. We’ve actually seen a Cal-Mag product worsen a Magnesium deficiency!Bottom Line: Treat a magnesium deficiency with magnesium only!