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Chemistry of Cr in some Swedish soils: V. Interaction between CrO₃ and Si(OH)₄ and its impact on Cr toxicity and elemental contents in ryegrass (Lolium perenne)
Plant and Soil
Vol. 123, No. 1 (April (I), 1990), pp. 89-93
Published by: Springer
Stable URL: http://www.jstor.org/stable/42938440
Page Count: 5
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The effect of Si(OH)₄ on Cr toxicity and elemental concentrations in ryegrass were investigated in a growth chamber using an acid and a neutral mineral soil. Each soil was treated with 50 mg Cr, as CrO₃, kg⁻¹ soil dry weight, singly, or in combination with 25 mg Si as Si(OH)₄. Plants growing in unamended soils were used as controls. Chromium toxicity, expressed as decrease in shoot or root dry weight, was increased by the Si. This increase was accompanied by a higher Cr uptake particularly on the acid soil. The shoot and root dry weights were significantly correlated (P = 1%) with the concentration of Cr, where r= -0.80 and -0.65, respectively. Uptake of Al, Cu, Fe, P and Zn did not show any consistent relationship to the magnitude of Cr toxicity.
Plant and Soil © 1990 Springer