Abstract
AbstractZinc (Zn2+) levels in the soil solution are in the parts per billion range. Most known Zn compounds are too soluble to control Zn2+ at such levels. However, ZnS (sphalerite) is a highly insoluble compound in the presence of even traces of H2S. Although H2S is thermodynamically unstable under aerobic conditions, concentrations of H2S actually found in the atmosphere are high enough to engender control of Zn2+ in the soil solution by ZnS in aerated soil samples. In soils, especially under anaerobic conditions, even higher levels of H2S prevail which could depress Zn2+ concentrations to very low levels. Some of the deleterious effects of H2S on plants under anerobic conditions actually may be due to Zn deficiency.
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