Background boron levels in U.S. soils were reported at a geometric mean concentration of 26 mg/kg with a maximum concentration of 300 mg/kg (Eckel and Langley 1988). Boron was detected in soils in Idaho at geometric mean concentrations of 4.6-9.8 mg/kg (Rope et al. 1988) and in sediments of Puget Sound (Malins et al. 1984).

Boron is an essential nutrient for plants. Boron soil concentrations for optimum plant growth reportedly range from 0.1 to 0.5 mg/kg for several plant species (Butterwick et al. 1989).

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