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A deficiency of this causes yellowing of the leaves. its common during vegetative simply because the plant is using it up just as fast as your putting it in. It also happens during flowering sometimes because most flowering fertilizers contain little or no nitrogen, as this is not a key nutrient...

Calcium and magnesium are the most abundant minerals in tap water and will influence the water hardness. Soft water, usually found in the Western/Northern parts of the UK, generally has an EC of below 0.4 and doesn’t contain much calcium or magnesium. Using a CalMag supplement in soft water...