Evaluation of phosphorus in thermally converted sewage sludge: P pools and availability to wheat
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Evaluation of phosphorus in thermally converted sewage sludge : P pools and availability to wheat. / Mackay, Jessica E.; Cavagnaro, Timothy R.; Jakobsen, Iver; Macdonald, Lynne M.; Grønlund, Mette; Thomsen, Tobias P.; Müller-Stöver, Dorette Sophie.
In: Plant and Soil, Vol. 418, No. 1-2, 2017, p. 307-317.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Evaluation of phosphorus in thermally converted sewage sludge
T2 - P pools and availability to wheat
AU - Mackay, Jessica E.
AU - Cavagnaro, Timothy R.
AU - Jakobsen, Iver
AU - Macdonald, Lynne M.
AU - Grønlund, Mette
AU - Thomsen, Tobias P.
AU - Müller-Stöver, Dorette Sophie
PY - 2017
Y1 - 2017
N2 - Aims: Dried sewage sludge (SS) and the by-products of four SS thermal conversion processes (pyrolysis, incineration and two types of gasification) were investigated for phosphorus (P) availability. Methods: A sequential extraction was used to determine the distribution of P among different P pools. After mixing materials with soil, availability of the P was determined with soil P extractions and in a growth experiment with wheat. Results: Thermally converted SS contained a greater proportion of P within recalcitrant pools than dried SS. Despite having very different P pool distributions, the incinerated and dried SS provided similar amounts of P to plants. Plant P supply from dried and incinerated SS was lower than the comparable soluble P treatment (50 mg P kg−1), but higher than a soluble treatment at a lower rate (20 mg P kg−1). Plant P uptake in gasified and pyrolysed treatments was only marginally greater than uptake in a control (no P) treatment. Plant P uptake correlated most closely with diffusive gradients in thin films (DGT) P analysis of soil-material mixes. Phosphorus availability in the dried and incinerated SS treatments increased over time. Conclusions: We propose that the dried and incinerated SS have potential as slow release P fertilisers in low pH soils.
AB - Aims: Dried sewage sludge (SS) and the by-products of four SS thermal conversion processes (pyrolysis, incineration and two types of gasification) were investigated for phosphorus (P) availability. Methods: A sequential extraction was used to determine the distribution of P among different P pools. After mixing materials with soil, availability of the P was determined with soil P extractions and in a growth experiment with wheat. Results: Thermally converted SS contained a greater proportion of P within recalcitrant pools than dried SS. Despite having very different P pool distributions, the incinerated and dried SS provided similar amounts of P to plants. Plant P supply from dried and incinerated SS was lower than the comparable soluble P treatment (50 mg P kg−1), but higher than a soluble treatment at a lower rate (20 mg P kg−1). Plant P uptake in gasified and pyrolysed treatments was only marginally greater than uptake in a control (no P) treatment. Plant P uptake correlated most closely with diffusive gradients in thin films (DGT) P analysis of soil-material mixes. Phosphorus availability in the dried and incinerated SS treatments increased over time. Conclusions: We propose that the dried and incinerated SS have potential as slow release P fertilisers in low pH soils.
KW - Bioash
KW - Biochar
KW - Diffusive gradients in thin films (DGT)
KW - Sequential phosphorus extraction
KW - Sewage sludge
KW - Wheat
U2 - 10.1007/s11104-017-3298-6
DO - 10.1007/s11104-017-3298-6
M3 - Journal article
AN - SCOPUS:85020233785
VL - 418
SP - 307
EP - 317
JO - Plant and Soil
JF - Plant and Soil
SN - 0032-079X
IS - 1-2
ER -
ID: 193502915