Abstract
Abstract Domestic sewage sludge applied to farm fields at a rate of 44.9 kg/ha in a mixture with lime and sawdust was found to increase the soil levels of cadmium, chromium, copper, lead, mercury, nickel and zinc. The average levels in sludge treated soil were: 0.11, 0.56, 3.59, 2.72, 0.068, 1.49 and 2.57 ppm, respectively. The increases were small and the overall loading factors were well below recommended maximums. The uptake of these heavy metals by grass and legume plants was variable with cadmium, copper and zinc levels being higher in those plants growing in the sludge treated soils but only copper was significantly higher. The heavy metal contents found were all within the levels normally found in grass and legume plants. The higher mean concentration in plants growing on the sludge treated soils were cadmium 0.495; chromium 1.22; copper 12.3; lead 1.54; mercury 0.022; nickel 4.08 and zinc 28.4 ppm.
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Claims 5
Claim · model-written summary
Sludge raised soil cadmium, chromium, copper, lead, mercury, nickel and zinc.
- Treatment
- Domestic sewage sludgee0
- Outcome
- soil levels of cadmium, chromium, copper, lead, mercury, nickel and zince0
- Direction
- increasee0
Not reportedTaxonComparator
Verbatim
e0“Domestic sewage sludge applied to farm fields at a rate of 44.9 kg/ha in a mixture with lime and sawdust was found to increase the soil levels of cadmium, chromium, copper, lead, mercury, nickel and zinc”
Claim · model-written summary
Cadmium was higher in plants on sludge treated soils.
- Taxon
- plantsViridiplantaee0
- Treatment
- sludge treated soilse0
- Outcome
- cadmiume0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“cadmium, copper and zinc levels being higher in those plants growing in the sludge treated soils”
Claim · model-written summary
Copper was significantly higher in plants on sludge treated soils.
- Taxon
- plantsViridiplantaee0
- Treatment
- sludge treated soilse0
- Outcome
- coppere0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“cadmium, copper and zinc levels being higher in those plants growing in the sludge treated soils but only copper was significantly higher”
Claim · model-written summary
Zinc was higher in plants on sludge treated soils.
- Taxon
- plantsViridiplantaee0
- Treatment
- sludge treated soilse0
- Outcome
- zince0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“cadmium, copper and zinc levels being higher in those plants growing in the sludge treated soils”
Claim · model-written summary
Heavy metal contents of grass and legumes remained within normal levels.
Verbatim
e0“The heavy metal contents found were all within the levels normally found in grass and legume plants”
The same questions in other papers
organic · nutrient: content · Viridiplantae (plants)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.