P Solubility of Inorganic and Organic P Sources

Kratz, Sylvia; Schick, Judith; Øgaard, Anne Falk

doi:10.1007/978-94-017-7612-7_7

Cited by 5 publications

(9 citation statements)

References 57 publications

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“…An evaluation of the fertilization potential of the compounds in these groups has been done in previous publications [31,32]. The chosen approach also neglects the role of the plant, the soil, and also the varying plant availability within one group [33]. Additionally, the assumption of equilibrium in the calculations gives a simplified picture of the potential P associations in the fuel blends.…”

Section: Phosphorus Speciation and Precipitationmentioning

confidence: 99%

Thermochemical equilibrium study of ash transformation during combustion and gasification of sewage sludge mixtures with agricultural residues with focus on the phosphorus speciation

Hannl

Sefidari

Kuba

et al. 2020

Biomass Conv. Bioref.

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The necessity of recycling anthropogenically used phosphorus to prevent aquatic eutrophication and decrease the economic dependency on mined phosphate ores encouraged recent research to identify potential alternative resource pools. One of these resource pools is the ash derived from the thermochemical conversion of sewage sludge. This ash is rich in phosphorus, although most of it is chemically associated in a way where it is not plant available. The aim of this work was to identify the P recovery potential of ashes from sewage sludge co-conversion processes with two types of agricultural residues, namely wheat straw (rich in K and Si) and sunflower husks (rich in K), employing thermodynamic equilibrium calculations. The results indicate that both the melting behavior and the formation of plant available phosphates can be enhanced by using these fuel blends in comparison with pure sewage sludge. This enhanced bioavailability of phosphates was mostly due to the predicted formation of K-bearing phosphates in the mixtures instead of Ca/Fe/Al phosphates in the pure sewage sludge ash. According to the calculations, gasification conditions could increase the degree of slag formation and enhance the volatilization of K in comparison with combustion conditions. Furthermore, the possibility of precipitating phosphates from ash melts could be shown. It is emphasized that the results of this theoretical study represent an idealized system since in practice, non-equilibrium influences such as kinetic limitations and formation of amorphous structures may be significant. However, applicability of thermodynamic calculations in the prediction of molten and solid phases may still guide experimental research to investigate the actual phosphate formation in the future.

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Section: Phosphorus Speciation and Precipitationmentioning

confidence: 99%

Thermochemical equilibrium study of ash transformation during combustion and gasification of sewage sludge mixtures with agricultural residues with focus on the phosphorus speciation

Hannl

Sefidari

Kuba

et al. 2020

Biomass Conv. Bioref.

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“…This imbalance can jeopardize the nutient cycling function and reduce the capacity of the organic systems to deliver ecosystem services, such as biomass production, in the long-term (Cooper et al, 2018;Goulding et al, 2009). However, it is also possible that the Olsen's P test does not accurately assess the pool of available P in the organically managed soils (Cooper et al, 2018;Kratz, Schick, & Øgaard, 2016). The broad range of elements provided by organic amendments might have caused sorption of P or immobilization in microbial biomass; these forms of P may be slowly available to crops but not reflected in the results of the Olsen's P test (Möller et al, 2018).…”

Section: Effects Of An Organic System On Sq Indicatorsmentioning

confidence: 99%

Grazed temporary grass‐clover leys in crop rotations can have a positive impact on soil quality under both conventional and organic agricultural systems

Zani

Gowing

Abbott

et al. 2020

European J Soil Science

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Soil quality (SQ) is the ability of soil to provide ecosystem functions and services. Implementation of a certain agricultural system can affect SQ and therefore play an essential role in achieving sustainable agriculture. The aim of this study was to explore how agricultural systems (conventional vs. organic), grazing regime (non-grazed vs. grazed) and the different proportions of temporary grass-clover leys in crop rotations (ley time proportion, LTP) affect SQ within a mixed (cropping and pasture/dairy system) commercial farming enterprise in the UK. Seven SQ indicators were evaluated, including chemical (pH; available phosphorus (P); potassium (K)), physical (bulk density, BD; aggregate stability, AS) and biological (total carbon (C); microbial biomass carbon, MBC) sectors. All SQ indicators were measured at three depth intervals (0-0.15, 0.15-0.30, 0.30-0.60 m), except for AS and MBC, which were only considered for the topsoil (0-0.15 m). The findings reflected existing knowledge on the advantages of organic vs. conventional systems for SQ indicators, with the former showing higher MBC and similar K, BD, AS and C in the 0-0.30-m compared to the latter. Lower topsoil available P in organic systems can be related to the lack of measurements in all P pools. When grazing was included: (a) both agricultural systems showed higher topsoil available P, C and MBC; and (b) there was a

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“…Several studies evaluated recycled P fertilizers based on extraction methods developed for conventional fertilizers. Extraction of fertilizer P with ammonium citrate (Kratz et al 2016), with neutral ammonium citrate for slightly acidic soils (Brod et al 2015b), with 0.5 M NaHCO 3 for neutral soils (Brod et al 2015b) or with DGT (a fertilizer-soil test) (Duboc et al 2017) have been proposed as best predictors for the availability of recycled P fertilizers to plants. These tests provide little information on the P forms and their reactions in the soil and in the case of DGT rely on costly incubation experiments.…”

Section: Introductionmentioning

confidence: 99%

Water soluble phosphate fertilizers for crops grown in calcareous soils – an outdated paradigm for recycled phosphorus fertilizers?

et al. 2017

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Background and aimsThe current paradigm for phosphorus (P) fertilizers applied to calcareous soil is that almost entirely water soluble P fertilizers are efficient and sparingly soluble P fertilizers are not efficient P sources for crops. We hypothesize that this paradigm does not apply to recycled P fertilizers and that other P pools can explain the plant use of recycled P fertilizers on calcareous soil. Methods We applied 33 P isotopic dilution method to evaluate recycled P fertilizers based on plant P uptake from fertilizer relative to plant uptake from a water soluble P reference fertilizer. The predictability of fertilizer effectiveness based on sequentially extracted P forms and X-ray diffraction pattern of recycled fertilizers derived from sewage sludge, human urine and organic waste was evaluated. ResultsThe plant experiments showed that tested recycled P fertilizers including compost were more effective than rock phosphate. The water insoluble P contained in urine based products was almost as effective as a fully water soluble P fertilizer. The tested recycled P fertilizers are characterized by complex P compounds differing in solubility which were so far not considered in the water and citric acid extraction methods. The fraction of resin-and NaHCO 3 extractable fertilizer P explained effectiveness of P fertilizer applied to the calcareous and to an acidic soil. Conclusion We concluded that water solubility is not required when P forms in recycled products are comparable to reactions products of rock phosphate based fertilizers in soil. Alternatives to fully water soluble P fertilizers are available to supply P to crops grown on calcareous soil efficiently.

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P Solubility of Inorganic and Organic P Sources

Cited by 5 publications

References 57 publications

Thermochemical equilibrium study of ash transformation during combustion and gasification of sewage sludge mixtures with agricultural residues with focus on the phosphorus speciation

Thermochemical equilibrium study of ash transformation during combustion and gasification of sewage sludge mixtures with agricultural residues with focus on the phosphorus speciation

Grazed temporary grass‐clover leys in crop rotations can have a positive impact on soil quality under both conventional and organic agricultural systems

Water soluble phosphate fertilizers for crops grown in calcareous soils – an outdated paradigm for recycled phosphorus fertilizers?

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