Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 31, 1997
Publication Date: N/A
Technical Abstract: Selenium may be present in soils and sediments in high concentrations, yet not mobile or available for plant uptake. The efficiency of phytoremediation of Se by canola (Brassica napus) in Kesterson Reservoir sediment collected from three (0-30, 30-60, and 60-90 cm) depths was evaluated under greenhouse conditions. Total and extractable soil Se were determined at preplant and postharvest. Dry matter yield and tissue Se were determined in harvested plant materials. Total soil Se concentrations at preplant were: 112 mg/kg soil in the 0-30 cm, 21 mg/kg soil in the 30-60 cm, and 10 mg/kg soil in the 60-90 cm. Shoot Se concentrations of canola grown in the 0-30, 30-60, and 60-90 cm depths were: 182, 53, and 19 mg/kg DM, respectively. Losses of total soil Se between preplant and postharvest were partially recovered by plant accumulation. Percentages of Se accumulated by canola relative to total Se loss at postharvest were: 23%, 15%, and 10% in the 0-30, 30-60- and 60-90 cm depths, respectively. The efficiency of canola to accumulate and reduce Se content of Kesterson soil was evaluated.