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Abstract
In 1993 and 1994, crop covering treatments [perforated polyethylene (PO, 500 holes/m 2) and a polypropylene (AO, Agryl-P17)] were used to produce different environmental conditions for the growth of Brassica pekinensis (Lour) Rupr cv. Nagaoka 50. Plant material was sampled five times from transplanting to harvest, and the amounts of chlorophylls, peroxidase activity, biomass, and Pb and Cd accumulation in the above-ground plant material were measured. Uncovered control plants, received lower air and root temperatures as well as lower relative humidity, and showed the highest chlorophyll a, chlorophyll b, carotene and peroxidase activity values. Under floating row covers (PO and AO) the improved thermal conditions resulted in increased fresh and dry mass and accumulation of Pb and Cd. It is also important to consider that because of this accumulation these plants may pose a risk for human health through Pb and Cd contamination of food supplies.
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