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Influence of sampling date on soil nitrogen availability indices

2012Journal article Open access
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dc.contributor.authorArrobas, Margarida
dc.contributor.authorFonseca, Telmo
dc.contributor.authorParada, Maria João
dc.contributor.authorRodrigues, M.A.
dc.date.accessioned2013-02-26T14:00:21Z
dc.date.available2013-02-26T14:00:21Z
dc.date.issued2012
dc.description.abstractIn spite of the great effort that has been devoted to the search for a chemical laboratory index to predict nitrogen (N) mineralization capability of soils, the results have not yet been fully satisfactory. A continued effort is still needed to increase the knowledge of the sources of variation that influence potentially available soil N. The time of sampling has received little attention, taking into account its potential to influence N-mineralization patterns. In this work, soil samples from three different agrosystems, consisting of a double-crop sequence of small grains and maize, an intensively grazed pasture, and a rainfed olive orchard, were collected at different dates. Several chemical extractions were performed, and the results were correlated with N uptake by turnip (Brassica campestris, L.) grown in a pot experiment. Kjeldahl N was the chemical test that best correlated (R2 = 0.621) with N uptake by turnip. Kjeldahl N showed great versatility relative to the origin of the soil samples. However, it was not very sensitive to the time of sampling. It did not detect changes occurring in the soil over a short period of time. Soil inorganic N showed the second highest coefficient of correlation (R2 = 0.483) with N uptake by turnip. In contrast to that observed with Kjeldahl N, soil inorganic N appeared as an index that can vary greatly over the short term. The hot saline potassium chloride (KCl) extractions gave generally fair results. The poorest, however, were obtained with the ultraviolet absorption of extracts of 0.01 mol L−1 sodium bicarbonate (NaHCO3) measured at 250- and 260-nm wavelengths.por
dc.identifier.citationArrobas, Margarida; Fonseca, Telmo; Parada, M.J.; Rodrigues, M.A. (2012). Influence of sampling date on soil nitrogen availability índices. Communications in Soil Science and Plant Analysis. ISSN 0010-3624. 43:19, p. 2521-2534por
dc.identifier.doi10.1080/00103624.2012.711870
dc.identifier.issn0010-3624
dc.identifier.urihttp://hdl.handle.net/10198/8156
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherTaylor & Francispor
dc.subjectHot KCL-NH4+por
dc.subjectKjeldahl Npor
dc.subjectNaHCO3 UV absorptionpor
dc.subjectNitrogen availabilitypor
dc.subjectOrganic Cpor
dc.subjectPot experimentpor
dc.titleInfluence of sampling date on soil nitrogen availability indicespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceUSApor
oaire.citation.endPage2534por
oaire.citation.startPage2521por
oaire.citation.titleCommunications in Soil Science and Plant Analysispor
oaire.citation.volume43por
person.familyNameArrobas
person.familyNameRodrigues
person.givenNameMargarida
person.givenNameManuel Ângelo
person.identifier.ciencia-id971C-B85B-1EC0
person.identifier.ciencia-id371D-DF0D-8D68
person.identifier.orcid0000-0002-4652-485X
person.identifier.orcid0000-0002-5367-1129
person.identifier.ridO-1721-2016
person.identifier.scopus-author-id8575728800
person.identifier.scopus-author-id35270106800
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationd057ae6b-331c-4980-967d-0ce4fe1bcf8a
relation.isAuthorOfPublication43621353-fa11-4559-9b24-27eba5ad3de0
relation.isAuthorOfPublication.latestForDiscoveryd057ae6b-331c-4980-967d-0ce4fe1bcf8a

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