Abstract
Abstract Two important requirements for organic fertilizers are to provide nutrients to plants and to improve the organic carbon stock of the soil. Different fertilizers do not fulfill these aspects to the same extent. Four organic fertilizers: digested sewage sludge (DS), DS compost (COM), cattle manure (CM), and pig slurry (PS) were compared in a greenhouse experiment on sandy and loamy soils, using sorghum as a test plant. The materials were applied based on their nitrogen content: 0, 91.5, 183 and 366 kg N ha–1 on sandy and 0, 75.5, 151 and 302 kg N ha–1 on loamy soil, respectively. In the soil total organic carbon (OC), labile organic carbon (POXC) and organic matter quality (Q) by ratio of absorbance determined in NaF and NaOH soil extracts were measured. The effect of fertilizers on average sorghum yield increase followed the same order on the two soils: COM (43%), CM (53%), DS (58%) and PS (87%). Despite the expectations, POXC did not prove to be an appropriate indicator for soil fertility in soils amended with the organic fertilizers. On loamy soil COM and CM while on sandy soil PS reduced the Q. Regarding the yield-increasing effect, the OC content and quality improvement on sandy soil COM and CM while on loamy soil PS proved to be the best organic fertilizer in the short term. Soil properties can significantly modify the effectiveness of organic fertilizers, primarily in terms of their effect on the organic matter quality.
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Claims 9
Claim · model-written summary
DS compost increased average sorghum yield by 43%.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of fertilizers on average sorghum yield increase followed the same order on the two soils: COM (43%), CM (53%), DS (58%) and PS (87%)”
t0“using sorghum as a test plant”
Claim · model-written summary
Cattle manure increased average sorghum yield by 53%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of fertilizers on average sorghum yield increase followed the same order on the two soils: COM (43%), CM (53%), DS (58%) and PS (87%)”
Claim · model-written summary
Digested sewage sludge increased average sorghum yield by 58%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of fertilizers on average sorghum yield increase followed the same order on the two soils: COM (43%), CM (53%), DS (58%) and PS (87%)”
Claim · model-written summary
Pig slurry increased average sorghum yield by 87%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of fertilizers on average sorghum yield increase followed the same order on the two soils: COM (43%), CM (53%), DS (58%) and PS (87%)”
Claim · model-written summary
POXC was judged unsuitable as a soil fertility indicator with organic fertilizer amendments.
- Outcome
- appropriate indicator for soil fertilitye0
- Qualifier
- soils amended with the organic fertilizerse0
Not reportedTaxonComparatorValue
Verbatim
e0“POXC did not prove to be an appropriate indicator for soil fertility in soils amended with the organic fertilizers”
Claim · model-written summary
COM and CM reduced organic matter quality on loamy soil.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On loamy soil COM and CM while on sandy soil PS reduced the Q”
t0“using sorghum as a test plant”
Claim · model-written summary
PS reduced organic matter quality on sandy soil.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On loamy soil COM and CM while on sandy soil PS reduced the Q”
t0“using sorghum as a test plant”
Claim · model-written summary
COM and CM were judged the best short-term fertilizers on sandy soil considering yield and organic carbon content and quality.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding the yield-increasing effect, the OC content and quality improvement on sandy soil COM and CM while on loamy soil PS proved to be the best organic fertilizer in the short term”
t0“using sorghum as a test plant”
Claim · model-written summary
PS was judged the best short-term fertilizer on loamy soil considering yield and organic carbon content and quality.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding the yield-increasing effect, the OC content and quality improvement on sandy soil COM and CM while on loamy soil PS proved to be the best organic fertilizer in the short term”
t0“using sorghum as a test plant”
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