SOIL DEPLETION
According to a study by David Thomas, the mineral content of the soil in United States farms has declined markedly between 1940 and 1991, with vegetables harvested in 1991 showing 76% less copper, 46% less calcium, 27% less iron and 24% less magnesium than their 1940 counterparts (Nutrition and Health 2003; 17: 85-115).
Why has this happened? According to Dr. William A. Albrecht, Chairman of the Department of Soils at the University of Missouri, “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.”
By NPK formulas, Dr. Albrecht is referring to the common use of inorganic fertilisers, which has gone on since the 1920’s, consisting mainly of nitrogen, phosphorus and potassium, with calcium and iron sometimes added. Essential trace elements, which would be replaced if organic fertilizers were used, never make it back into the soil.
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