AN UNBIASED VIEW OF ZINC SULFIDE

Soils contaminated with zinc from mining, refining, or fertilizing with zinc-bearing sludge can have several grams of zinc for every kilogram of dry soil. Levels of zinc in extra of 500 ppm in soil interfere with the flexibility of plants to absorb other crucial metals, like iron and manganese.Mining was unmechanized and labor-intense, with pickme