Can someone explain soil depletion and how it can be reduced?

Question: Thanks!

Answer: according to the web page below: Perhaps the best summary is by Dr. William A. Albrecht, Chairman of the Department of Soils at the University of Missouri, who said: "A declining soil fertility, due to a lack of organic material, major elements, and trace minerals, is responsible for poor crops and in turn for pathological conditions in animals fed deficient foods from such soils, and that mankind is no exception." Dr Albrecht goes further to unequivocally lay the blame: "NPK formulas, as legislated and enforced by State Departments of Agriculture, mean malnutrition, attack by insects, bacteria and fungi, weed takeover, crop loss in dry weather, and general loss of mental acuity in the population, leading to degenerative metabolic disease and early death."

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