Nitrogen Fixation of Sulla under Mediterranean Conditions. (Articolo in rivista)

Type
Label
  • Nitrogen Fixation of Sulla under Mediterranean Conditions. (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.2134/agronj2009.0151 (literal)
Alternative label
  • Sulas L., Seddaiu G., Muresu R., and Roggero P.P. (2009)
    Nitrogen Fixation of Sulla under Mediterranean Conditions.
    in Agronomy journal (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Sulas L., Seddaiu G., Muresu R., and Roggero P.P. (literal)
Pagina inizio
  • 1470 (literal)
Pagina fine
  • 1478 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 101 (literal)
Rivista
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR ISPAAM (literal)
Titolo
  • Nitrogen Fixation of Sulla under Mediterranean Conditions. (literal)
Abstract
  • Sulla coronaria (L.) B.H. Choi & H. Ohashi (=Hedysarum coronarium L.) is a Mediterranean forage legume grown extensively in rainfed Italian environments. Here we report the fi eld quantifi cation of its seasonal and annual N fi xation, using the 15N isotopic dilution (ID) method, the infl uence of various nonfi xing reference species on these estimates, and the allocation of fi xed N between the aerial and the belowground biomass. Parallel experiments were conducted over two biennial crop cycles at two Italian locations (Sassari and Ancona), characterized by sandy-loam to heavy clay-loam calcareous soils. Th e proportion of nitrogen derived from the atmosphere (%Ndfa) present in the aerial biomass reached 78.2% at Sassari and 82.7% at Ancona, with no signifi cant eff ect of the identity of the nonfi xing reference species. At Sassari, the amount of fi xed N present in the aerial dry matter (DM) of sulla was 187 kg ha-1 in the fi rst crop cycle, and 265 kg ha-1 in the second, while the equivalent N yields at Ancona were 350 and 170 kg ha-1. Th e relationship between the quantity of fi xed N in the aerial biomass and the aerial DM yield of sulla was signifi cant and not site-specifi c, realizing an equivalence of about 1.8 kg ha-1 of fi xed N per 100 kg ha-1 of aerial DM. Th e relative contribution of the root biomass to the amount of fi xed N was on average 4%. Th e N balance of sulla at the end of the second crop cycle was negative, but the N sparing eff ect compared with the nonfi xing species ranged from 65 to 175 kg ha-1. (literal)
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