Abstract
Aim of study: To evaluate the effects of conventional tillage (CT) and no tillage (NT) systems on the soil organic carbon (SOC) changes, CO2 emissions and their relation with soil temperature and grain yield in a monoculture of irrigated maize during six years.Area of study: In Zamadueñas experimental field in the Spanish province of Valladolid, from 2011 to 2017.Material and methods: The SOC content was determined by collecting soil samples up to 30 cm in November at two years interval. Short-term CO2 emissions were measured simultaneously with soil temperature using a respiration chamber and a hand-held probe immediately before, after every tillage operation and during the maize cycle.Main results: The SOC stock of the top 30 cm soil layers was 13% greater under NT than CT. Short-term CO2 emissions were significantly higher under CT ranging from 0.8 to 3.4 g CO2 m-2 h-1 immediately after tillage while under NT system, soil CO2 fluxes were low and stable during this study period. During the first 48 h following tillage, cumulative CO2 emissions ranged from 0.6 to 2.4 Mg CO2 ha-1 and from 0.2 to 0.3 Mg CO2 ha-1 under CT and NT systems, respectively. Soil temperature did not show significant correlation with CO2 emissions; however, it depended mostly on the time of measurement.Research highlights: No tillage increased the SOC accumulation in the topsoil layer, reduced CO2 emissions without decreasing maize grain yield and minimized the impact on climate change compared to CT system.
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Claims 7
Claim · model-written summary
Top 30 cm soil organic carbon stock was 13% greater under no tillage than conventional tillage.
Zea maysNot reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SOC stock of the top 30 cm soil layers was 13% greater under NT than CT.”
t0“maize”
Claim · model-written summary
Short-term CO2 emissions were significantly higher with conventional tillage than no tillage immediately after tillage.
- Treatment
- CTe0
- Outcome
- CO2 emissionse0
- Direction
- highere0
- Value
- 0.8 to 3.4 g CO2 m-2 h-1e0
- Qualifier
- immediately after tillagee0
- Comparator
- NT systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term CO2 emissions were significantly higher under CT ranging from 0.8 to 3.4 g CO2 m-2 h-1 immediately after tillage while under NT system, soil CO2 fluxes were low and stable during this study period.”
t0“maize”
Claim · model-written summary
During the first 48 hours after tillage, cumulative emissions were 0.6 to 2.4 Mg CO2 ha-1 under conventional tillage.
- Treatment
- CTe0
- Outcome
- cumulative CO2 emissionse0
- Value
- 0.6 to 2.4 Mg CO2 ha-1e0
- Qualifier
- first 48 h following tillagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first 48 h following tillage, cumulative CO2 emissions ranged from 0.6 to 2.4 Mg CO2 ha-1 and from 0.2 to 0.3 Mg CO2 ha-1 under CT and NT systems, respectively.”
t0“maize”
Claim · model-written summary
During the first 48 hours after tillage, cumulative emissions were 0.2 to 0.3 Mg CO2 ha-1 under no tillage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first 48 h following tillage, cumulative CO2 emissions ranged from 0.6 to 2.4 Mg CO2 ha-1 and from 0.2 to 0.3 Mg CO2 ha-1 under CT and NT systems, respectively.”
t0“maize”
Claim · model-written summary
Soil temperature was not significantly correlated with CO2 emissions.
Not reportedCompoundSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil temperature did not show significant correlation with CO2 emissions”
t0“maize”
Claim · model-written summary
Soil temperature depended mostly on measurement time.
- Outcome
- it depended mostly on the time of measuremente0
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it depended mostly on the time of measurement.”
t0“maize”
Claim · model-written summary
No tillage did not decrease maize grain yield relative to conventional tillage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No tillage increased the SOC accumulation in the topsoil layer, reduced CO2 emissions without decreasing maize grain yield and minimized the impact on climate change compared to CT system.”
t0“maize”
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