Abstract
Organic residues may cause major health and environmental problems. This is the case in our study area, where more than 10 billion L per year of residential and industrial waste are produced. Land application of biosolids can be an economical solution by recycling waste and can provide valuable fertilizer if used correctly. The aim of this work was to study the effect of biosolids on the chemical properties of an Oxisol. The experiment was located at Ilha Solteira northwest of São Paulo State, Brazil. The soil was cropped to Sorghum bicolor.The field experimental design consisted of random blocks with six treatments and four replications of each treatment. Biosolids were surface applied to four treatments at rates of 5, 10, 20, and 40 Mg ha(-1) on a dry matter basis; in addition, a treatment with mineral fertilizer and a control were included. One year after biosolids application, soil samples were taken at 0-10, 10-20, and 20-40 cm. Organic matter content (Walkley-Black) and pH (CaCl2) were routinely determined. Cation exchange capacity, exchangeable bases (Ca, Mg, K), and P were determined by exchange resin extraction. No significant differences in any of the analyzed properties were found below the 20 cm depth. Extractable phosphorus (P) and potassium (K) increased with increasing biosolids rate in the top 20 cm, whereas calcium (Ca) and (Ma) magnesium content were not significantly influenced by biosolids. Soil pH decreased with increasing biosolids application. The sewage sludge application did not influence the sorghum production in the first year of culture, under unfavorable soil moisture conditions, but it influenced the dry matter.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Below 20 cm, analyzed soil properties did not differ significantly.
- Taxon
- Sorghum bicolor
Sorghum bicolore1 - Outcome
- analyzed propertiese0
- Qualifier
- below the 20 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences in any of the analyzed properties were found below the 20 cm depth.”
e1“Sorghum bicolor”
Claim · model-written summary
Extractable phosphorus and potassium increased as biosolids rate increased in the top 20 cm.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- biosolids ratee0
- Outcome
- Extractable phosphorus (P) and potassium (K)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extractable phosphorus (P) and potassium (K) increased with increasing biosolids rate in the top 20 cm”
e1“Sorghum bicolor”
Claim · model-written summary
Calcium and magnesium content were not significantly influenced by biosolids.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- biosolidse0
- Outcome
- calcium (Ca) and (Ma) magnesium contente0
- Direction
- not significantly influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“calcium (Ca) and (Ma) magnesium content were not significantly influenced by biosolids.”
e1“Sorghum bicolor”
Claim · model-written summary
Soil pH decreased with increasing biosolids application.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- biosolids applicatione0
- Outcome
- Soil pHe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil pH decreased with increasing biosolids application.”
e1“Sorghum bicolor”
Claim · model-written summary
Sewage sludge did not influence first-year sorghum production under unfavorable soil moisture.
- Treatment
- sewage sludge applicatione0
- Outcome
- sorghum productione0
- Direction
- did not influencee0
- Qualifier
- under unfavorable soil moisture conditionse0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sewage sludge application did not influence the sorghum production in the first year of culture, under unfavorable soil moisture conditions, but it influenced the dry matter.”
Claim · model-written summary
Sewage sludge influenced sorghum dry matter.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sewage sludge application did not influence the sorghum production in the first year of culture, under unfavorable soil moisture conditions, but it influenced the dry matter.”
The same questions in other papers
organic · yield · SorghumResults differ
6 papers in the same direction as this paper · 20 in the opposite direction
- positive
- positive
- positive
23 papers more in this group
See all 27 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.