Conservation Agriculture practices reduce the global warming potential of rainfed low N input semi-arid agriculture

Téllez del Río, Ángela and Vallejo Garcia, Antonio and García Marco, Sonia and Martín Lammerding, Diana and Tenorio, J. L. and Rees, Robert M. and Guardia Vázquez, Guillermo (2017). Conservation Agriculture practices reduce the global warming potential of rainfed low N input semi-arid agriculture. "European Journal of Agronomy" (n. 84); pp. 95-104. ISSN 1161-0301. https://doi.org/10.1016/j.eja.2016.12.013.

Description

Title: Conservation Agriculture practices reduce the global warming potential of rainfed low N input semi-arid agriculture
Author/s:
  • Téllez del Río, Ángela
  • Vallejo Garcia, Antonio
  • García Marco, Sonia
  • Martín Lammerding, Diana
  • Tenorio, J. L.
  • Rees, Robert M.
  • Guardia Vázquez, Guillermo
Item Type: Article
Título de Revista/Publicación: European Journal of Agronomy
Date: March 2017
Subjects:
Freetext Keywords: N2O emission; CH4 emission; Yield; Rotation; Winter wheat; Tillage
Faculty: E.T.S. de Ingeniería Agronómica, Alimentaria y de Biosistemas (UPM)
Department: Química y Tecnología de Alimentos
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Conservation tillage and crop rotations improve soil quality. However, the impact of these practices on greenhouse gas (GHG) emissions and crop yields is not well defined, particularly in dry climates. A rainfed 2-year field-experiment was conducted to evaluate the effect of three long-term (17–18 years) tillage systems (Conventional Tillage (CT), Minimum Tillage (MT) and No Tillage (NT)) and two cropping systems (rotational wheat (Triticum aestivum L.) preceded by fallow, and wheat in monoculture), on nitrous oxide (N2O) andmethane (CH4) emissions,during twofieldcampaigns. Soilmineral N, water-filled pore space, dissolved organic carbon (C) and grain yield were measured and yield-scaled N2O emissions, N surplus and Global Warming Potentials (GWP) were calculated. No tillage only decreased cumulative N2O losses (compared to MT/CT) during campaign 1 (the driest campaign with least fertilizer N input), while tillage did not affect CH4 oxidation. The GWP demonstrated thatthe enhancement of C stocks under NT caused this tillage management to decrease overall CO2 equivalent emissions. Monoculture increased N2O fluxes during campaign 2 (normal year and conventional N input) and decreased CH4 uptake, as opposed to rotational wheat. Conversely, wheat in monoculture tended to increase soil organic C stocks and therefore resulted in a lower GWP, but differences were not statistically significant. Grain yields were strongly influenced by climatic variability. The NT and CT treatments yielded most during the dry and the normal campaign, and the yield-scaled N2O emissions followed the same tendency. Minimum tillage was not an adequate tillage management considering the GWP and the yield-scaled N2O emissions (which were 39% lower in NT with respect to MT). Regarding the crop effect, wheat in rotation resulted in a 32% increase in grain yield and 31% mitigation of yield-scaled N2O emissions. Low cumulative N2O fluxes (<250 g N2O-N ha-1 campaign-1) highlighted the relevance of soil organic C and CO2 emissions from inputs and operations in rainfed semi-arid cropping systems. This study suggests that NT and crop rotation can be recommended as good agricultural practices in order to establish an optimal balance between GHGs fluxes, GWP, yield-scaled N2O emissions and N surpluses.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainAGL2012-37815-C05-01-AGRUnspecifiedUnspecifiedUnspecified
Madrid Regional GovernmentS2013/ABI-2717UnspecifiedUnspecifiedUnspecified

More information

Item ID: 49983
DC Identifier: http://oa.upm.es/49983/
OAI Identifier: oai:oa.upm.es:49983
DOI: 10.1016/j.eja.2016.12.013
Official URL: https://www.sciencedirect.com/science/article/pii/S116103011630257X?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 06 Apr 2018 07:52
Last Modified: 25 Mar 2019 09:48
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