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Nitrous oxide and denitrification N-losses from an irrigated sandy loam soil fwertilised with organic N fertilisers in Central Spain

AuthorsVallejo, A.; Díez López, José Antonio ; López Valdivia, Luis M.; Arce, A.; López-Fernández, S.
KeywordsPig slurry
Nitrous oxide
denitrification and emission
Issue Date2003
CitationProceedings of 8th International Conference on Environmental Science and Technology. Lemnos Island, Greece, 8-10 September 2003: 894-901 (2003)
AbstractDenitrification losses and N::,o emiss ions were rarely measured in irrigated crops in Southem European countries des pite the fact that the surface area s used ter such craps are important. The eím of this study was to quantify the nitrous oxide (N20) and the den itrification 105Se$ that occur in irriqated crops in Central Spain and at the same tim e to evaluate fue effeet of different organic fe rtilisers . The field experiment was carried out al La Paveda f tekl Station (30 km south-e ast of Madrid, Spain) on corn crop in 2001. The com was irrigated 10 times in doses varying from 32 to 52 mm per session. The soil is a cafcaric Fluvisol and has a sandy-loam texture (13% d ay) and pH=8.1. Fertiliser treatments were: Surface- apptied pig slurry (SPS), immedialely incorporaled pig slurry (IPS), sheep manure (SM), urea (U) and a control treatment (Control) without any fe rttliser. Al! the fertilisers were applied using the same N-dose (200 kg N na'). The N;>O was sampled by means o( the closed chamber method. Denitrification was also estimated in the tield with a core incubation method in the presence acetylene (C2H2) . With all the treatments, high N20 emission occurred in the first month following the administration of fe rtilizers (April). Also during the whole irrigation period , the emission was activated very considerably and reached maximum values ter the SM and lSP treatment after the 3'dirrigation (11 July) of 16.1 and 14.1 mg N m·2d-\ respectively . The U treatment had a flow of 4.8 mg N m-2 d". whJle the SSP and the control treatment had similar flows (1.8 and 2.4 mg N m-2 d" , respeetively). In the penad of May-Jcne and in September-Oetober emission of N20 was vero¡ low and took basicaüy place vía me njtrification process as the water filled pare space (WFPS) did not surpass the _ denitrification threshold activation value, which was 63% in this soil. The percentage of : N20 lost with regard to the N applied during the whcle period (200 d) varied between 1.27 and 1.46 % acccrdinq to the type of treatment. The denitnficat ion rate (DR) differences between samples of each treatment could be explained with the WFPS evolution and the soil temperature during the malze growing season. Denitríñcation losses in the top 10 cm layer scil from the control, U, SM, SPS and IPS were, respe etively, 13.1, 27.2, 49.7, 35.1 and 42.2 kg N ha" during ~e whole períod (200d).
Description8 páginas, 4 figuras y 1 tabla estadística
Appears in Collections:(ICA) Comunicaciones congresos
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