Kelling, K.A. and Keeney, D.R. and Walsh, L.M. and Ryan, J.A. (1977) A field study of the agricultural use of sewage sludge. 3. Effect on uptake and extractability of sludge-borne metals. Journal of Environmental Quality, 6 (4). pp. 352-358.
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Abstract
Following application of 60 t liquid sewage sludge/ha on sandy and silty loam soils in Wisconsin, Cu, Zn, Cd, Ni and Cr contents in foliage of sorghum X Sudan grass hybrid and rye and in maize grain and stover were determined for 4 consecutive crops. The Cu, Zn, Cd and Ni contents of vegetative tissue and Zn content of maize grain were increased with sludge application, whereas Cr was not accumulated. In all cases metal conc. was below levels toxic to plants. Av. total recovery by the 3 spp. was <1% for Cu, Zn, Cd and Ni and 1-3% for Zn. Levels of DTPA-extractable Cu, Zn, Cd and Ni, but not Cr, were increased by sludge treatment. Regression analyses suggested that DTPA may be useful in predicting metal contents in plant tissue although the relationships differed between spp. Decreases in metal contents of plant tissue and in DTPA extracts indicated reversion to less-available forms of Zn, Cd and possibly Ni. The ratio of Cd:Zn was approx. 33% of that of sludge in all spp
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Soil Science, Wisconsin University, Madison, WI 53706, USA |
| Subjects: | Environmental Science |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 11 Oct 2012 10:39 |
| Last Modified: | 11 Oct 2012 10:39 |
| Official URL: | http://dx.doi.org/10.2134/jeq1977.0047242500060004... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8390 |
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