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Photo Credit shih-wei/iStock/Getty Images. Magnesium is a naturally occurring element that people need as a key nutrient. The human body relies on magnesium for various purposes, and people who don't have enough can suffer various symptoms, through dry, itchy skin is not considered one of them.
Magnesium (Mg) deficiency is a detrimental plant disorder that occurs most often in strongly acidic, light, sandy soils, where magnesium can be easily leached away.Magnesium is an essential macro nutrient found from 0.2-0.4% dry matter and is necessary for normal plant growth.A plant with Magnesium deficiency. Excess potassium, generally due to fertilizers, further aggravates the stress from the magnesium deficiency, as does aluminium toxicity.agnesium is an essential macro nutrient found from 0.2-0.4% dry matter and is necessary for normal plant growth. A plant with Magnesium deficiency. Excess potassium, generally due to fertilizers, further aggravates the stress from the magnesium deficiency, as does aluminium toxicity.