Field assessment of trace element uptake by six vegetables from N-Viro Soil
Abstract:A field experiment was conducted to measure the uptake of selected trace elements (Cd, Cu, Ni, Pb, and Zn) by six vegetable crops (cabbage, carrot, dry bean, lettuce, potato, and tomato) from a single large (500 mt/ha) application of N-Viro Soil, an advanced alkaline stabilized biosolids product. Crops were grown for 3 yr (1993, 1994, 1995) after application of the biosolids in 1992. Differences among the metals for uptake by the different crops were consistent and were overall in the order: Zn > Cu > Ni > Cd > Pb. This reflects both the total soil content (Zn > Pb > Ni = Cu > Cd) and intrinsic solubilities of the metals in soil (Cd > Zn > Cu > Ni > Pb). Trace element plant uptake declined from 1993 to 1995. In general, lettuce, bean, and tomato had the highest relative trace element concentrations and cabbage the lowest, and the carrot and potato peels were elevated only in Pb compared with the flesh. Plant uptake response slopes were low compared with literature values and often negative, and the results suggest that large applications of the test material pose no threat to the food chain from trace element uptake by crops.
Document Type: Research Article
Publication date: January 1, 1997
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