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Dry weight of amaranth shoot in six Cd-contaminated soils under 440 mg·kg−1 Si treatments (A) and in soil 3 under 0, 220, 440, 660, and 880 mg·kg−1 Si added dosages (B). 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.
