Nitrous oxide emissions from a light-textured arable soil of North-Western Russia: effects of crops,fertilizers, manures and climate parameters |
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Authors: | N P Buchkina E V Balashov E Y Rizhiya K A Smith |
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Affiliation: | (1) Agrophysical Research Institute, 14 Grazhdansky prospect, St. Petersburg, 195220, Russia;(2) School of Geosciences, University of Edinburgh, Edinburgh, UK |
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Abstract: | Direct nitrous oxide emissions from a light-textured arable soil typical of North-Western Russia and subject to different
management systems were measured during three growing seasons (May–September) in 2003–2005. Cumulative fluxes varied between
0.26 ± 0.06 and 2.98 ± 1.56 kg N2O–N ha−1, with the lowest flux produced where no N was added as mineral fertilizers/manures or where green manure/low inputs of mineral
fertilizer were used as a source of N. Highest cumulative fluxes were measured from the plots where high inputs of farmyard
manure were used. Of the crops studied, potatoes produced the highest N2O fluxes; this was attributed to the use of furrows, in which the soil tended to be more compact with higher water-filled
pore space, making the soil more prone to denitrification than that in fields without furrows. The available N content of
the soil at the start of each growing season was quite low and cumulative N2O fluxes were significantly affected by N-fertilizer application within one growing season. However, for different growing
seasons with highly changeable rainfall patterns and with different soil management for different crops, the quite high yearly
correlation between N application and N2O fluxes was much reduced. |
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