Impact of Digestate Application on Chemical and Microbiological Properties of Two Different Textured Soils

Makádi, Marianna; Szegi, Tamás; Tomócsik, Attila; Orosz, Viktória; Michéli, Erika; Ferenczy, A.; Posta, Katalin; Bíró, Borbála

doi:10.1080/00103624.2015.1109652

Cited by 15 publications

(16 citation statements)

References 21 publications

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Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogensupporting

confidence: 76%

“…However, the C and N contents obtained may not be representative of longterm effects of biogas digestate vs. mineral fertiliser, which may also depend on soil texture (Makádi et al, 2016). The increase in HWN in BD after tillage indicates an increase in easily mineralisable organic N which probably originates from soil biomass and lysates (Ghani et al, 2003;Leinweber et al, 1995) and implies an accelerated microbial turnover of soil organic N. This seems reasonable since the microbial community is able to adjust its structure and activity relatively fast to utilise formerly protected organic matter after exposure due to disruption of aggregates by tillage (Jackson et al, 2003;La Scala et al, 2008).…”

Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogenmentioning

confidence: 99%

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Tillage-induced short-term soil organic matter turnover and respiration

Fiedler

Leinweber

Jurasinski

et al. 2016

SOIL

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Abstract. Tillage induces decomposition and mineralisation of soil organic matter (SOM) by the disruption of macroaggregates and may increase soil CO 2 efflux by respiration, but these processes are not well understood at the molecular level. We sampled three treatments (mineral fertiliser: MF; biogas digestate: BD; unfertilised control: CL) of a Stagnic Luvisol a few hours before and directly after tillage as well as 4 days later from a harvested maize field in northern Germany and investigated these samples by means of pyrolysis-field ionisation mass spectrometry (Py-FIMS) and hot-water extraction. Before tillage, the Py-FIMS mass spectra revealed differences in relative ion intensities of MF and CL compared to BD most likely attributable to the cattle manure used for the biogas feedstock and to relative enrichments during anaerobic fermentation. After tillage, the CO 2 effluxes were increased in all treatments, but this increase was less pronounced in BD. We explain this by restricted availability of readily biodegradable carbon compounds and possibly an inhibitory effect of sterols from digestates. Significant changes in SOM composition were observed following tillage. In particular, lignin decomposition and increased proportions of N-containing compounds were detected in BD. In MF, lipid proportions increased at the expense of ammonia, ammonium, carbohydrates and peptides, indicating enhanced microbial activity. SOM composition in CL was unaffected by tillage. Our analyses provide strong evidence for significant short-term SOM changes due to tillage in fertilised soils.

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Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogensupporting

confidence: 76%

Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogenmentioning

confidence: 99%

Tillage-induced short-term soil organic matter turnover and respiration

Fiedler

Leinweber

Jurasinski

et al. 2016

SOIL

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“…The C, HWC, N and HWN contents of the treatments showed no differences before tillage (Table 1), thus confirming the outcomes of other field experiments with similar fertilisers (Makádi et al, 2016;Odlare et al, 2014). However, the C and N contents obtained may not be representative of longterm effects of biogas digestate vs. mineral fertiliser, which may also depend on soil texture (Makádi et al, 2016). The increase in HWN in BD after tillage indicates an increase in easily mineralisable organic N which probably originates from soil biomass and lysates (Ghani et al, 2003;Leinweber et al, 1995) and implies an accelerated microbial turnover of soil organic N. This seems reasonable since the microbial community is able to adjust its structure and activity relatively fast to utilise formerly protected organic matter after exposure due to disruption of aggregates by tillage (Jackson et al, 2003;La Scala et al, 2008).…”

Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogensupporting

confidence: 84%

Section: Bulk Soil and Hot-water-extracted Carbon And Nitrogensupporting

confidence: 79%

“…Pyrolysis-field ionisation mass spectrometry (Py-FIMS) is a very sensitive method and has been applied successfully to investigate differences in the chemical composition of SOM under different fertiliser treatments like mineral NPK fertiliser or farmyard manure (Jandl et al, 2004;Leinweber et al, 2008;Schmidt et al, 2000). Even very small alterations in the composition and stability of dissolved organic matter -a very reactive part of SOMduring storage in the refrigerator (Schulten et al, 2008) or diurnal cycles of CO 2 assimilation and respiration (Kuzyakov et al, 2003;Melnitchouck et al, 2005) have been detected and resolved by multivariate statistics of mass-spectrometric fingerprints. Furthermore, Py-FIMS of bulk SOM has revealed alterations in laboratory incubation experiments and allowed for these to be linked to respiration and enzyme activities (Leinweber et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Tillage-induced short-term soil organic matter turnover and respiration

Fiedler¹,

Leinweber²,

Jurasinski³

et al. 2016

Preprint

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Abstract. Tillage induces decomposition and mineralisation of soil organic matter (SOM) by the disruption of macroaggregates and may increase soil CO2 efflux by respiration, but these processes are not well understood at the molecular level. We sampled three treatments (mineral fertiliser = MF, biogas digestate = BD, unfertilised control = CL) of a stagnic luvisol a few hours before and directly after tillage, and four days later from a harvested maize field in Northern Germany and investigated these samples by pyrolysis-field ionization mass spectrometry (Py-FIMS) and hot-water extraction. Before tillage, BD showed much more volatilised matter (VM) during pyrolysis, indicating an increased amount of SOM. The Py-FIMS mass spectra revealed distinct differences in relative ion intensities of undisturbed soil compared to BD most likely attributable to the cattle manure used for the biogas feedstock and to relative enrichments during anaerobic fermentation. After tillage, the CO2 effluxes were increased in all treatments, but this increase was less pronounced in BD. We explain this by a restricted availability of labile carbon and, possibly an inhibitory effect of sterols from digestates. Despite high spatial variability, significant changes in SOM composition were observed following tillage. In particular, lignin decomposition and increased proportions of N-containing compounds were detected in BD. In MF, lipid proportions increased at the expense of carbohydrates and peptides, indicating an enhanced microbial activity. SOM composition in CL was unaffected by tillage. In summary, combining all analyses data provided strong evidence for significant shortterm SOM changes due to tillage in fertilized soils.

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