Abstract
Sewage sludge can be a source of micronutrients, such as zinc (Zn) and nickel (Ni), for Cerrado soils; however, since they are heavy metals, continuous use of this residue requires an evaluation of the dynamics of these elements in the soil/plant system. This study aimed to evaluate the dynamics of Zn and Ni in a soil/plant system regarding extraction methods to determine the quantity of plant nutrients in the soil as well as the soil enzymatic activity in an area treated with sewage sludge for eleven years. Sewage sludge was applied annually in an Oxisol and a crop was sown. The accumulated sewage sludge doses throughout the eleven years of the experiment were 0 as control, 55, 110 and 167.5 Mg ha-1, and corn was the test crop. At 60 days after sowing, corn soil samples were collected from the 0-10 cm layer (for analysis of enzymatic activity) and 0-20cm, 20-40 cm (for analysis of Zn and Ni). The activities of the enzymes urease and dehydrogenase and the extractors Mehlich-1, Mehlich-3 and DTPA were evaluated. The increments of Zn and Ni in the Cerrado Oxisol as a function of sewage sludge application over a long time were small. The Mehlich-3 extractant was the best correlated with Zn and Ni extraction by the corn plants. In the eleventh year of application, sewage sludge was not efficient at supplying Zn to plants. The application of high doses of sewage sludge for a long time affects soil enzymatic activity.
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Claims 4
Claim · model-written summary
Long-term sludge application caused small soil zinc and nickel increases.
- Treatment
- sewage sludge applicatione0
- Outcome
- increments of Zn and Ni in the Cerrado Oxisole0
- Direction
- incrementse0
- Qualifier
- smalle0
Not reportedTaxonComparator
Verbatim
e0“The increments of Zn and Ni in the Cerrado Oxisol as a function of sewage sludge application over a long time were small.”
Claim · model-written summary
Mehlich-3 correlated best with corn zinc and nickel extraction.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- Zn and Ni extraction by the corn plantse0
- Direction
- best correlatede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Mehlich-3 extractant was the best correlated with Zn and Ni extraction by the corn plants.”
Claim · model-written summary
In year eleven sludge did not efficiently supply zinc to plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- sewage sludgee0
- Outcome
- supplying Zn to plantse0
- Direction
- not efficiente0
Not reportedComparator
Verbatim
e0“In the eleventh year of application, sewage sludge was not efficient at supplying Zn to plants.”
Claim · model-written summary
Long-term high dose sludge application affected soil enzyme activity.
Not reportedTaxonComparatorDirection
Verbatim
e0“The application of high doses of sewage sludge for a long time affects soil enzymatic activity.”
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.