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Ciencia del suelo
On-line version ISSN 1850-2067
Abstract
COSENTINO, VANINA ROSA NOEMÍ; BRUTTI, LUCRECIA NOEMÍ; CIVEIRA, GABRIELA and TABOADA, MIGUEL ÁNGEL. APORTE DE LA FIJACIÓN BIOLÒGICA DE NITRÒGENO A LA EMISIÓN DE NzO DESDE EL SUELO CON CULTIVO DE SOJA. Cienc. suelo [online]. 2015, vol.33, n.2. ISSN 1850-2067.
Nitrous oxide (N2O) is the main greenhouse gas (GHG) emitted from agricultural soils as a by-pass product of nitrification and denitrification processes. The Intergovernmental Panel on Climate Change (IPCC) excluded from its GHG inventory guidelines in 2006 the Nitrogen Biological Fixation (NBF) as a source of N2O emissions by crop legumes, due to the lack of solid scientific evidenceon the existence of these emissions. However, at present the actual amount of N2O emissions by crop legumes in the field is still under investigation, with special emphasis on soybeans which are is the main commodity produced by Argentina and a main biodiesel source. The influence of NBF on N2O emissions can be tested using non-nodulating soybean varieties. This study aims to compare and analyse N2O emissions from nodulating and non-nodulating soybean varieties in order to clarify the actual influence of this commodity on field GHG emissions. Gas samples were collected from closed non-vented chambers. N2O emissions ranged from -9 to +15 |ig N-N2O m-2 h-1 and only in the last sampling date, values differed significantly between treatments (non-nodulating > nodulating soybean). N2O emissions were positively related with soil N-NO3 concentration and soil water-filled pore space (WFPS). Results show that in this field study, NBF caused only a slight impact on N2O emissions. These results agree with the latest IPCC guidelines in 2006 for GHG inventories.
Keywords : N2O flux, non nodulating soybean, legumes.