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Effect of Lime on Lead Uptake by Five Plant Species¹

ABSTRACT

Liming at 0, 2.2, and 4.4 tons/hectare (0, 1, and 2 English tons/acre) was tested as a means of reducing Pb uptake by five species from two Pb contaminated soils. The soils represent the 0- to 10- and 10- to 30-cm horizons of Los Osos clay loam (a Typic Argixeroll) and contained 94 ± 18 and 32 ± 7 ppm Pb, respectively. There was no effect of lime on yield, but Pb concentrations in tops were reduced. At all times of harvest and lime rates the Pb concentration followed the series Glycine max L. >> Trifolium subterraneum L. > Zea mays L. = Avena sativa L. = Triticum aestivum L.

Key Words: lead pollution • heavy metal contamination

¹ Contribution from the Department of Soil Science & Plant Nutrition, and Department of Agronomy & Range Science, University of California, Davis.

² Research Assistant and Assistant Agronomist.

Received for publication July 15, 1971.