Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen

Manures can be treated by solid–liquid separation and more sophisticated, subsequent approaches. These processes generate fertilizers, which may differ in composition and N<sub>2</sub>O release potential. The aim of the study was to investigate the influence of processing-related changes...

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Autores principales:	Ioana Petrova Petrova, Carola Pekrun, Kurt Möller
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nitrous oxide treated digestates techniques denitrification separation pelletization Agriculture S
Acceso en línea:	https://doaj.org/article/3f76aa694ed444149cef79b22fefafd1
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spelling	oai:doaj.org-article:3f76aa694ed444149cef79b22fefafd12021-11-25T16:07:06ZOrganic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen10.3390/agronomy111122152073-4395https://doaj.org/article/3f76aa694ed444149cef79b22fefafd12021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4395/11/11/2215https://doaj.org/toc/2073-4395Manures can be treated by solid–liquid separation and more sophisticated, subsequent approaches. These processes generate fertilizers, which may differ in composition and N<sub>2</sub>O release potential. The aim of the study was to investigate the influence of processing-related changes in digestate composition on soil-derived N<sub>2</sub>O emissions after application to soil. For that purpose, N<sub>2</sub>O emissions within the first 7 weeks after fertilization with two raw and eight processed digestates (derived from solid–liquid separation, drying and pelletizing of separated solid, and vacuum evaporation of separated liquid) were measured in the field in 2015 and 2016. Additionally, an incubation experiment was run for 51 days to further investigate the effect of subsequent solid and liquid processing on soil-derived N<sub>2</sub>O release. The results showed that, only in 2016, the separation of digestate into solid and liquid fractions led to a decrease in N<sub>2</sub>O emissions in the following order: raw digestate > separated liquid > separated solid. N removal during subsequent processing of separated solid and liquid did not significantly influence the N<sub>2</sub>O emissions after fertilization. In contrast, the concentrated application of the final products led to contradictory results. Within the solid processing chain, utilization of pellets considerably increased the N<sub>2</sub>O emissions by factors of 2.7 (field, 2015), 3.5 (field, 2016), and 7.3 (incubation) compared to separated solid. Fertilization with N-rich ammonium sulfate solution led to the lowest emissions within the liquid processing chain. It can be concluded that the input of less recalcitrant organic C into the soil plays a greater role in N<sub>2</sub>O release after fertilization than the input of ammoniacal N. Digestate processing did not generally reduce emissions but apparently has the potential to mitigate N<sub>2</sub>O emissions substantially if managed properly.Ioana Petrova PetrovaCarola PekrunKurt MöllerMDPI AGarticlenitrous oxidetreated digestatestechniquesdenitrificationseparationpelletizationAgricultureSENAgronomy, Vol 11, Iss 2215, p 2215 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nitrous oxide treated digestates techniques denitrification separation pelletization Agriculture S
spellingShingle	nitrous oxide treated digestates techniques denitrification separation pelletization Agriculture S Ioana Petrova Petrova Carola Pekrun Kurt Möller Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
description	Manures can be treated by solid–liquid separation and more sophisticated, subsequent approaches. These processes generate fertilizers, which may differ in composition and N<sub>2</sub>O release potential. The aim of the study was to investigate the influence of processing-related changes in digestate composition on soil-derived N<sub>2</sub>O emissions after application to soil. For that purpose, N<sub>2</sub>O emissions within the first 7 weeks after fertilization with two raw and eight processed digestates (derived from solid–liquid separation, drying and pelletizing of separated solid, and vacuum evaporation of separated liquid) were measured in the field in 2015 and 2016. Additionally, an incubation experiment was run for 51 days to further investigate the effect of subsequent solid and liquid processing on soil-derived N<sub>2</sub>O release. The results showed that, only in 2016, the separation of digestate into solid and liquid fractions led to a decrease in N<sub>2</sub>O emissions in the following order: raw digestate > separated liquid > separated solid. N removal during subsequent processing of separated solid and liquid did not significantly influence the N<sub>2</sub>O emissions after fertilization. In contrast, the concentrated application of the final products led to contradictory results. Within the solid processing chain, utilization of pellets considerably increased the N<sub>2</sub>O emissions by factors of 2.7 (field, 2015), 3.5 (field, 2016), and 7.3 (incubation) compared to separated solid. Fertilization with N-rich ammonium sulfate solution led to the lowest emissions within the liquid processing chain. It can be concluded that the input of less recalcitrant organic C into the soil plays a greater role in N<sub>2</sub>O release after fertilization than the input of ammoniacal N. Digestate processing did not generally reduce emissions but apparently has the potential to mitigate N<sub>2</sub>O emissions substantially if managed properly.
format	article
author	Ioana Petrova Petrova Carola Pekrun Kurt Möller
author_facet	Ioana Petrova Petrova Carola Pekrun Kurt Möller
author_sort	Ioana Petrova Petrova
title	Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
title_short	Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
title_full	Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
title_fullStr	Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
title_full_unstemmed	Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen
title_sort	organic matter composition of digestates has a stronger influence on n<sub>2</sub>o emissions than the supply of ammoniacal nitrogen
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3f76aa694ed444149cef79b22fefafd1
work_keys_str_mv	AT ioanapetrovapetrova organicmattercompositionofdigestateshasastrongerinfluenceonnsub2suboemissionsthanthesupplyofammoniacalnitrogen AT carolapekrun organicmattercompositionofdigestateshasastrongerinfluenceonnsub2suboemissionsthanthesupplyofammoniacalnitrogen AT kurtmoller organicmattercompositionofdigestateshasastrongerinfluenceonnsub2suboemissionsthanthesupplyofammoniacalnitrogen
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Organic Matter Composition of Digestates Has a Stronger Influence on N<sub>2</sub>O Emissions than the Supply of Ammoniacal Nitrogen

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