Zinc toxicity from tire rubber in soilless potting media
1996
Handreck, K.A.
Petunia 'Stereo Red' and Impatiens 'Impulse Violet' were grown in soilless potting media that contained either 0, 5, 10, or 20% by volume of ground tire rubber. The pH of half of each medium was adjusted to 5.0 and that of the other half to 6.5. Shoot weights declined with increasing rubber content, due to increasingly severe zinc (Zn) toxicity. Lower shoot weights at pH 6.5 than at pH 5.0 were attributed to manganese (Mn) deficiency that was unrelated to the presence of rubber. Extrapolation from the experimental data indicated that Petunia 'Stereo Red' would have been damaged by as little as a 2% inclusion of tire rubber. The high risk of Zn toxicity means that ground tire rubber should not be included in soilless potting media.
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