Effect of tillage and crop (cereal versus legume) on greenhouse gas emissions and Global Warming Potential in a non-irrigated Mediterranean field

Guardia, Guillermo; Tellez-Rio, Angela; García‐Marco, Sonia; Martín‐Lammerding, Diana; Tenorio, J. L.; Ibáñez, Miguel; Vallejo, Antonio

doi:10.1016/j.agee.2016.01.047

Cited by 73 publications

(67 citation statements)

References 54 publications

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“…The experimental design was a three-replicated split plot, divided into three main plots assigned to the three tillage systems (NT, MT and CT) in a randomized complete block design (Guardia et al, 2016). Each of the main plots were further divided into five subplots (10 x 25 m) assigned in a completely randomized design to the phases of an annual crop rotation, involving fallowwheat (Triticum aestivum L var.…”

Section: Experimental Design and Managementmentioning

confidence: 99%

“…Dissolved organic C (DOC) and soil mineral N concentrations (NH 4 + -N and N0 3~-N) were determined by extracting with deionized water or KC1 (1 M), respectively. Afterwards, DOC and mineral N contents were analyzed using a total organic C analyser (multi N/C 3100 Analitykjena) or a flow injection analyzer (FIAS 400 Perkin Elmer), respectively, as described in Guardia et al (2016). The water-filled pore space (WFPS) was determined and calculated as explained in Tellez-Rio etal.…”

Section: Soil Crop Analyses and Meteorological Datamentioning

confidence: 99%

“…Bulk density was determined (Grossman and Reinsch, 2002) each year (GomezPaccard et al, 2015;Guardia et al, 2016) for the same soil depths as SOC. In order to relate gaseous emissions to soil properties, soil samples were collected from 0 to 15 cm depths during the growing season on almost all gas-sampling occasions.…”

Section: Soil Crop Analyses and Meteorological Datamentioning

confidence: 99%

“…The sink of SOC ('ASOC') in the top 30 cm of soil and CO2 emissions from fuel used in farm operations (e.g. tillage, herbicide and fertilizer application, seeding, harvest) and from manufacturing inputs (operation GHG emission + input GHG emission) were calculated as described by Guardia et al (2016). The 'ASOC component, as an indicator of the soil C balance, was calculated taking the difference in SOC stocks between M-CT (as the baseline, since it represents the conventional and traditional management in comparison to the evaluated Conservation Agriculture practices) and the other treatments.…”

Section: Ysne N Surplus and Gwp Calculationsmentioning

confidence: 99%

“…Fluxes of N 2 0 and CH 4 were measured from October 2011 to October 2013, using the static chamber technique as described in Guardia et al (2016). One chamber (diameter 35.6 cm, height 19.3 cm) was placed in each subplot and closed for 1 h. GHGs were sampled three times per week during the first and second week, then twice per week during the first month after fertilization events or during rainfall periods and then, every week or every two weeks until the end of the cropping period.…”

Section: Ghg Emissions Sampling and Analyzingmentioning

confidence: 99%

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

Tellez-Rio

Vallejo

García‐Marco

et al. 2017

European Journal of Agronomy

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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 (N2 0) and methane (CH4) emissions, during two field campaigns. Soil mineral N, water-filled pore space, dissolved organic carbon (C) and grain yield were measured and yield-scaled N 2 0 emissions, N surplus and Global Warming Potentials (GWP) were calculated. No tillage only decreased cumulative N 2 0 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 that the 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 N 2 0 emissions followed the same tendency. Minimum tillage was not an adequate tillage management considering the GWP and the yield-scaled N 2 0 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 (<250gN 2 O-Nha _1 campaign -1 ) highlighted the relevance of soil organic C and C0 2 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 N 2 0 emissions and N surpluses.

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Section: Experimental Design and Managementmentioning

confidence: 99%

Section: Soil Crop Analyses and Meteorological Datamentioning

confidence: 99%