From the source: "The high rate of magnesium deficiency now postulated [5,6,7,8] can be attributed in part to a steady decline in general magnesium content in cultivated fruits and vegetables, a reflection of the observed depletion of magnesium in soil over the past 100 years [11,12,13]. A report to Congress was already sounding the alarm as far back as the 1930s, pointing out the paucity of magnesium, and other mine…
Can it be solved by simply adding more magnesium to the fertilizer?
This seems really, really hard to regulate.