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Efficiency of organic nitrogen fertilization of potato in Northeast Portugal

dc.contributor.authorRodrigues, M.A.
dc.contributor.authorCoutinho, João
dc.contributor.authorMartins, Fernando
dc.date.accessioned2010-03-08T11:38:51Z
dc.date.available2010-03-08T11:38:51Z
dc.date.issued2001
dc.description.abstractThe study was conducted over a 4 year period with the purpose of measuring N mineralization using an in situ incubation technique, following the application of farmyard manure, poultry manure or municipal solid waste. The results varied from –10 % (net immobilization) to +28 % (net mineralization) in relation to the total organic N applied. N fluxes were assessed through plant N analysis during the growing season and through determination of potato tuber dry weight (TDW), N uptake by tubers and the apparent N recovery (ANR) of added N at harvest. Organic material applications slightly increased TDW above the control treatment (9 to 25%), although the results indicate a shortage of N, where no N was added to the crop. The effect of organic fertilization on N uptake by tubers was also limited. Petiole nitrate concentration and estimated net N mineralization were in agreement with trends in TDW and N uptake by tubers, with no differences in soil N availability between the control and organic treatments. Values of ANR were particularly low, ranging from 4 to 23 %. The results suggest that caution is needed when judging the contribution of organic fertilization to N nutrition of crops, which have a short growing season. Synchronization between N release and plant uptake is discussed.pt
dc.identifier.citationInternational Conference on Environmental Problems Associated with Nitrogen Fertilisation of Field Grown Vegetable Crops. Potsdam, 2001. p. 179-186. ISBN 978-90-66059-74-0pt
dc.identifier.doi10.17660/ActaHortic.2001.563.22
dc.identifier.isbn978-90-66059-74-0
dc.identifier.issn0567-7572
dc.identifier.urihttp://hdl.handle.net/10198/2205
dc.language.isoengpt
dc.publisherInternational Society for Horticultural Sciencept
dc.relation.ispartofseriesActa Horticulturae;563
dc.subjectFarmyard manurept
dc.subjectMunicipal solid wastept
dc.subjectPoultry manurept
dc.subjectNitrogen mineralizationpt
dc.subjectNitrogen uptakept
dc.subjectSolanum tuberosum L.pt
dc.titleEfficiency of organic nitrogen fertilization of potato in Northeast Portugalpt
dc.typeconference paper
dspace.entity.typePublication
oaire.citation.endPage186pt
oaire.citation.startPage179pt
oaire.citation.titleActa Horticulturaept
person.familyNameRodrigues
person.givenNameManuel
person.identifier.ciencia-id371D-DF0D-8D68
person.identifier.orcid0000-0002-5367-1129
person.identifier.ridO-1721-2016
person.identifier.scopus-author-id35270106800
rcaap.rightsopenAccesspt
rcaap.typeconferenceObjectpt
relation.isAuthorOfPublication43621353-fa11-4559-9b24-27eba5ad3de0
relation.isAuthorOfPublication.latestForDiscovery43621353-fa11-4559-9b24-27eba5ad3de0

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