THE IMPACT OF SOIL TREATMENT AND MOISTURE REGIME ON N2O EMISSIONS FROM AGRICULTURAL SOIL

Eihe, P.; Grinfelde, I.; Pilecka, J.; Valujeva, K.; Vebere, L. L.
Abstract:
Nitrous oxide N2O is one of the major contributors to global warming and ozone depletion in the stratosphere. Management of agricultural soils is the largest source of N2O emissions in agricultural sector, therefore simultaneous and accurate measurement of N2O concentration is necessary. Nitrous oxide emission is formed within nitrification and denitrification processes in agricultural soils. The agricultural sector is one of the largest sources of greenhouse gas emissions in Latvia as it accounted for 24.6 % of the total greenhouse emissions in the country in 2017. The aim of the study was to compare the effects of conventional tillage and minimal tillage and different moisture regimes on N2O emissions from agricultural soils. During the vegetation season 2019 in Latvia, 24 unmixed soil samples as well as two reference samples were taken from different crop fields: winter wheat, bean, winter rapeseed, summer barley. Soil samples were collected from Latvia University of Life Sciences and Technologies study farm “Peterlauki” located in Platone parish. Measurements of N2O emissions from soil samples under various moisture conditions were performed in a laboratory with a Picarro G2508 spectrophotometer. N2O emission measurements show the complex nature of N2O gas formation, where a number of factors influence the action of microorganisms, such as soil temperature, soil structure, soil reaction, the availability of nitrogen ions in the soil, the availability of degradable material and water in the soil. Crop rotation, tillage, nitrogen sources and indicators in collaboration with the time and depth of nitrogen compounds interactions have a significant impact on N2O emissions into the soil. In almost all measurements of N2O emissions there was observed a tendency for emissions to increase in soil samples with minimal tillage in all moisture regimes. The exception occurred in measurements from over-watered bean soil sample with minimal tillage – N2O emissions increased rapidly only during the last days of performed experiment.
SGEM Research areas:
Year:
2020
Type of Publication:
In Proceedings
Keywords:
GHG; Picarro G2508; nitrous oxide; soil treatment; moisture regime; minimal tillage; conventional tillage
Volume:
20
SGEM Book title:
20th International Multidisciplinary Scientific GeoConference SGEM 2020
Book number:
4.1
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
515-522
Publisher address:
51 Al. Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
Period:
18 - 24 August, 2020
ISBN:
978-619-7603-09-5
ISSN:
1314-2704
Conference:
20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
DOI:
10.5593/sgem2020/4.1/s19.064
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