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Effects of amendments on the Cd availability and Cd immobilization rate (%) in 440 mg·kg−1 Si amended six soils (A,B) and in soil 3 under 0, 220, 440, 660, and 880 mg·kg−1 Si added dosages (C,D). Control, non-amendment treatment; MS, 4A molecular sieve; WS, wollastonite. Data are means ± SE (n = 4). Different letters above the adjacent bars or lines denote a significant (p < 0.05) difference among the treatments in the same soil.
