Boron is at the same time essential for plant growth and toxic to sensitive plants at low concentrations. Experience has shown that soil systems have very limited capacity for boron adsorption, so it is conservative to assume a zero removal potential for land treatment systems. Industrial wastewaters may have a higher boron content than typical municipal effluents; the boron content may influence the type of crop selected but will not control the feasibility of land treatment. Tolerant crops such as alfalfa, cotton, sugar beets, and sweet clover might accept up to 2 to 4 mg/L boron in the wastewater; semi-tolerant crops such as corn, barley, milo, oats, and wheat might accept 1 to 2 mg/L; and sensitive crops such as fruits and nuts should receive less than 1 mg/L.
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