| Popis: |
Changes in lead content of Hordeum, Avena and Solanum crops were studied. Hordeum grown near a motorway contained more lead than a similar crop growing near a less busy road; the lead content of all three crops grown near the motorways was greatest in plants located in a narrow zone by the side of the road, with a significant drop in content of plants situated between 20 and 50 m from the road. The lead content of crops growing within a short distance from the motorway increased with time, as the ground covered by the plant became greater. There was, however, a reduction in the content of Hordeum and Avena when the leaves withered and fell off, whilst the content of the Solanum crop became greater as leaf surface area increased to a maximum. |
