Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry

Pig slurry as a fertilizer source has been extensively used in agriculture; however, in order to reduce the risks of contaminating the water supplies given its high level of N sources, it is important to understand the N transformations occurring in the soil where it is applied. In this study, incub...

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Autores principales:	Quiroz,Madelaine, Varnero,María Teresa
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2015
Materias:	Degraded soil microbial activity N mineralization N immobilization pig slurry
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400012
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spelling	oai:scielo:S0718-583920150004000122018-10-01Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurryQuiroz,MadelaineVarnero,María Teresa Degraded soil microbial activity N mineralization N immobilization pig slurry Pig slurry as a fertilizer source has been extensively used in agriculture; however, in order to reduce the risks of contaminating the water supplies given its high level of N sources, it is important to understand the N transformations occurring in the soil where it is applied. In this study, incubations were performed at 25 °C for a period of 63 to 73 d to evaluate the effect of different doses of pig slurry on the global microbiological activity and the N dynamics in time, with an emphasis on N mineralization and nitrification in a soil subject to aggregate extraction. The slurry was applied in doses equivalent to: 0, 162, 244, and 325 m³ ha-1, constituting four treatments: T0, T50, T75, and T100, respectively. The microbiological activity and the contents of NH4+-N and NO3-- N were measured. Increasing doses of slurry produced an increase in the evolution of the accumulated CO2, with 63.5, 115.0, 112.7, and 125.7 mg 100 g-1 soil for T0, T50, T75, and T100 respectively. A similar situation was observed in the initial contents of NH4+-N, which were 22.4, 30.3, 44.3, and 60.7 mg kg-1 in each treatment, respectively. On the other hand, the increase in NO3-- N contents were only noticed by the end of the incubation period and corresponded to 28.6, 69.0, 95.3, and 109.8 mg kg-1. In addition, the net N mineralization was predominant in all treatments with slurry during the measurement period, being 9.1, 45.4, 58.1, and 52.7 mg kg-1 for T0, T50, T75 and T100, respectively, at the end of the trial. The mineralization rate of the organic C decreased when increasing the dose of slurry and the mineralization rate of the organic N resulted to be low, which would indicate a high contribution of material resistant to degradation by the slurry, which could have a long term effect in the soil.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.75 n.3 20152015-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400012en10.4067/S0718-58392015000400012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Degraded soil microbial activity N mineralization N immobilization pig slurry
spellingShingle	Degraded soil microbial activity N mineralization N immobilization pig slurry Quiroz,Madelaine Varnero,María Teresa Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
description	Pig slurry as a fertilizer source has been extensively used in agriculture; however, in order to reduce the risks of contaminating the water supplies given its high level of N sources, it is important to understand the N transformations occurring in the soil where it is applied. In this study, incubations were performed at 25 °C for a period of 63 to 73 d to evaluate the effect of different doses of pig slurry on the global microbiological activity and the N dynamics in time, with an emphasis on N mineralization and nitrification in a soil subject to aggregate extraction. The slurry was applied in doses equivalent to: 0, 162, 244, and 325 m³ ha-1, constituting four treatments: T0, T50, T75, and T100, respectively. The microbiological activity and the contents of NH4+-N and NO3-- N were measured. Increasing doses of slurry produced an increase in the evolution of the accumulated CO2, with 63.5, 115.0, 112.7, and 125.7 mg 100 g-1 soil for T0, T50, T75, and T100 respectively. A similar situation was observed in the initial contents of NH4+-N, which were 22.4, 30.3, 44.3, and 60.7 mg kg-1 in each treatment, respectively. On the other hand, the increase in NO3-- N contents were only noticed by the end of the incubation period and corresponded to 28.6, 69.0, 95.3, and 109.8 mg kg-1. In addition, the net N mineralization was predominant in all treatments with slurry during the measurement period, being 9.1, 45.4, 58.1, and 52.7 mg kg-1 for T0, T50, T75 and T100, respectively, at the end of the trial. The mineralization rate of the organic C decreased when increasing the dose of slurry and the mineralization rate of the organic N resulted to be low, which would indicate a high contribution of material resistant to degradation by the slurry, which could have a long term effect in the soil.
author	Quiroz,Madelaine Varnero,María Teresa
author_facet	Quiroz,Madelaine Varnero,María Teresa
author_sort	Quiroz,Madelaine
title	Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
title_short	Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
title_full	Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
title_fullStr	Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
title_full_unstemmed	Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry
title_sort	microbiological activity and n transformations in a soil subjected to aggregate extraction amended with pig slurry
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400012
work_keys_str_mv	AT quirozmadelaine microbiologicalactivityandntransformationsinasoilsubjectedtoaggregateextractionamendedwithpigslurry AT varneromariateresa microbiologicalactivityandntransformationsinasoilsubjectedtoaggregateextractionamendedwithpigslurry
_version_	1714205351492976640

Microbiological activity and N transformations in a soil subjected to aggregate extraction amended with pig slurry

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