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OLS Field Name OLS Field Data
Main Title Trace elements in agricultural soils. Fluxes, balances and background values.
Author Andersson, A. ;
CORP Author Swedish Environmental Protection Agency, Solna.
Publisher Jul 92
Year Published 1992
Report Number SNV-4077;
Stock Number DE93778470
Additional Subjects Soils ; Agriculture ; Arsenic ; Cadmium ; Chromium ; Copper ; Environmental Transport ; Experimental Data ; Fertilizers ; Lead ; Manganese ; Mercury ; Nickel ; Nutrients ; Sewage Sludge ; Trace Amounts ; Zinc ; Tables(data) ; Foreign technology ; EDB/540220 ; Soil chemistry ; Trace elements
Library Call Number Additional Info Location Last
NTIS  DE93778470 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 08/23/1993
Collation 49p
Abstract Balances between removed and supplied quantities of trace elements indicate slow depletion of the micro nutrients Zn, Cu and Mn in farming based on cash crops and conventional fertilization. In farming based on livestock there is a slow increase caused by the utilization of manure and additions in feed additives. The soil levels of Cd, Hg and Pb are slowly increasing in both types of farming, mainly due to additions in commercial fertilizers (Cd) and by deposition (Cd, Hg, Pb). The rate of increase is for Cd ca 0.20-025%, for Hg 0.10-0.20% and for Pb 0.04-0.09% annually. Where recommended applications of sewage sludge are utilized, these rates are increased by factors of 2, 4 and 12, respectively. Despite improvements, the major parts of most trace elements in sewage sludge are still of other origins than food and agricultural soils. Probable quantities of trace elements added to agricultural soils during this century have been estimated. Sources considered were commercial fertilizers, lime, feed additives, fungicides and the atmospheric deposition. The estimates indicate that the concentrations of Cd, Hg and Pb have been increased by ca 33, 46 and 14%, respectively, based on the levels 1900. For Zn, Cu, Mn, Ni and Cr estimated increases are 10% (Zn) or below, i.e. rather small and insignificant. Locally the situation may, however, be different. Any increase of the present soil contents of toxic elements has to be considered unfavourable. Therefore, in order to obtain steady state conditions the additions of Cd, Hg and Pb should be reduced to 0.25-0.75, 0.025-0.095 and 0.9-7 gxha(sup -1)xyear(sup -1), respectively. (72 refs., 14 tabs.) (au).
Category Codes 98A; 99A
NTIS Prices PC A03/MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 320415458
Origin NTIS
Type CAT