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Comparable bacterial-mediated nitrogen supply and losses under organic reduced tillage and conventional intensive tillage


Loaiza Puerta, Viviana; Six, Johan; Wittwer, Raphael; van der Heijden, Marcel; Pujol Pereira, Engil Isadora (2019). Comparable bacterial-mediated nitrogen supply and losses under organic reduced tillage and conventional intensive tillage. Soil Biology and Biochemistry, 95:103121.

Abstract

The impact of organic and conventional crop management together with two variations of conservation tillage was evaluated on N supply and losses at the end of a 4-year Swiss crop rotation. Soil samples were taken from four cropping systems: conventional intensive tillage (C-IT), conventional no tillage (C-NT), organic intensive tillage (O-IT) and organic reduced tillage (O-RT). Laboratory incubations were used to estimate rates of net mineralization, gross nitrification and potential denitrification, while quantitative PCR was used to determine copy numbers of genes of relevant enzymes in these processes. N supply via mineralization and nitrification was unaffected by cropping system. Significant decrease in bacterial ammonia oxidizer (AOB) abundance at the end of the gross nitrification incubation indicated greater responsiveness of this group for activity, in particular under conventional management. C-NT produced the highest potential denitrification, although only significantly different than C-IT. O-RT was similar to C-IT and C-NT in terms of soil N supply and N gaseous losses, meaning that added benefits through its use does not compromise plant N availability or increase N2O losses compared to conventional practices.

Abstract

The impact of organic and conventional crop management together with two variations of conservation tillage was evaluated on N supply and losses at the end of a 4-year Swiss crop rotation. Soil samples were taken from four cropping systems: conventional intensive tillage (C-IT), conventional no tillage (C-NT), organic intensive tillage (O-IT) and organic reduced tillage (O-RT). Laboratory incubations were used to estimate rates of net mineralization, gross nitrification and potential denitrification, while quantitative PCR was used to determine copy numbers of genes of relevant enzymes in these processes. N supply via mineralization and nitrification was unaffected by cropping system. Significant decrease in bacterial ammonia oxidizer (AOB) abundance at the end of the gross nitrification incubation indicated greater responsiveness of this group for activity, in particular under conventional management. C-NT produced the highest potential denitrification, although only significantly different than C-IT. O-RT was similar to C-IT and C-NT in terms of soil N supply and N gaseous losses, meaning that added benefits through its use does not compromise plant N availability or increase N2O losses compared to conventional practices.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
07 Faculty of Science > Zurich-Basel Plant Science Center
Dewey Decimal Classification:580 Plants (Botany)
Uncontrolled Keywords:Insect Science, Soil Science, Microbiology
Language:English
Date:1 November 2019
Deposited On:07 Feb 2020 11:37
Last Modified:07 Feb 2020 11:49
Publisher:Elsevier
ISSN:0038-0717
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.ejsobi.2019.103121

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