Abstract
Abstract Excessive applications of sewage sludge and pig manure have led to the accumulation of potentially toxic elements in soils. The objective of this study was to examine the NaNO 3 extractability of Cu, Zn, and Cd with time and in relation to soil pH and soil organic matter content and to investigate the concentrations of these metals in pea ( Pisum arvense L.) as a result of liming. The field study was conducted on an orthic luvisol with pig manure and sewage sludge application rates of 5 t dry organic matter ha −1 yr −1 from 1976 to 1984. After 1984, all field plots were equally treated with mineral fertilizers and in 1991, lime was added to half of each plot. The soil pH decreased in all unlimcd treatments about half a unit from 1985 to 1994. Concurrently, the Zn and Cd concentrations extractable with 0.1 M NaNO 3 increased as well as the Cd concentrations in field pea. Liming raised the soil pH by approximately one unit to 6.4 and 6.9 in pig manure‐ and sewage sludge‐treated plots, respectively and resulted in decreasing concentrations of Cu, Zn, and Cd in seeds and crop residues of field pea. The results suggested that plant uptake and solubility of Zn, Cu, and Cd can continue to be higher in sewage sludge‐ and pig manure‐treated soils than in control plots during a 10‐yr period after the applications were ceased. Liming most effectively reduces the solubility and the plant uptake of Zn and Cd.
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Claims 4
Claim · model-written summary
Extractable zinc and cadmium and cadmium in field pea increased as pH fell in unlimed plots.
Verbatim
e0“The soil pH decreased in all unlimcd treatments about half a unit from 1985 to 1994. Concurrently, the Zn and Cd concentrations extractable with 0.1 M NaNO 3 increased as well as the Cd concentrations in field pea.”
Claim · model-written summary
Liming decreased copper, zinc, and cadmium concentrations in pea seeds and residues.
- Taxon
- field peae0
- Organ / stage
- seeds and crop residuese0
- Treatment
- Liminge0
- Outcome
- concentrations of Cu, Zn, and Cd in seeds and crop residuese0
- Direction
- decreasinge0
Not reportedComparator
Verbatim
e0“Liming raised the soil pH by approximately one unit to 6.4 and 6.9 in pig manure‐ and sewage sludge‐treated plots, respectively and resulted in decreasing concentrations of Cu, Zn, and Cd in seeds and crop residues of field pea.”
Claim · model-written summary
Metal uptake and solubility may remain higher in amended than control plots ten years after application stopped.
Verbatim
e0“plant uptake and solubility of Zn, Cu, and Cd can continue to be higher in sewage sludge‐ and pig manure‐treated soils than in control plots during a 10‐yr period after the applications were ceased”
Claim · model-written summary
Liming most effectively reduces zinc and cadmium solubility and plant uptake.
- Taxon
- field peae1
- Treatment
- Liminge0
- Outcome
- the solubility and the plant uptake of Zn and Cde0
- Direction
- reducese0
Not reportedComparator
Verbatim
e0“Liming most effectively reduces the solubility and the plant uptake of Zn and Cd.”
e1“seeds and crop residues of field pea”
The same questions in other papers
lime · nutrient: content · Lathyrus oleraceus (pea)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
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See all 5 papers →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.