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Dušikovi izotopi v zelenjavi glede na način gojenja = Nitrogen isotopes in vegetables with regard to the cultivation methodŠink, NatašaUporaba različnih gnojil ima vpliv na ostanek nitratov v rastlinah. Pri uporabi organskih gnojil pretvorba amonijskega dušika v nitrat poteka počasneje kot pri mineralnih lahko topnih gnojilih. ... Zaradi počasnejše pretvorbe ne prihaja do presežkov nitrata v rastlinah, kar pa se lahko zgodi pri predoziranju lahko topnih mineralnih gnojil.V gnojilu, v tleh in v rastlini se pojavljajo različni izotopi dušika (glede na vrsto gnojila), kar nam pomaga pri preverjanju izvora zelenjave. To je pomembno pri preverjanju ekološke zelenjave. Prisotnost težjih izotopov v rastlinah kaže na zelenjavo ekološkega izvora, prisotnost lažjih izotopov kaže na prisotnost gnojil anorganskega izvora. Pri raziskavi smo uporabili deskriptivno metodo in komparativno metodo dveh načinov pridelovanja zelenjave. Organsko gnojilo je bil kompostiran prašičji gnoj, urea pa je bila mineralno gnojilo. Rastline, kiso rasle na s kompostom pognojenih tleh, so vsebovale 27,2 % iz NH4 + dušika, z ureo gnojene pa 8,7 % iz NH4 + dušika.Z merjenjem du.ikovih izotopovne moremo sklepati o na.inu gojenja. Visoke pozitivne vrednosti fÂ15N sicer ka.ejo na gnojenje z organskimi gnojili, nizke vrednosti fÂ15N ali celo negativne vrednosti fÂ15N pa kažejo na možno gnojenje z lahko topnimi dušikovimi gnojili, ki vsebujejo večjo količino lažjih izotopov dušika.Source: Prenos inovacij, znanj in izkušenj v vsakdanjo rabo [Elektronski vir] : zbornik referatov (Str. [1-6])Type of material - conference contribution ; adult, seriousPublish date - 2012Language - slovenianCOBISS.SI-ID - 1024250730
Author
Šink, Nataša
Topics
gnojilo |
dušik |
nitrat |
nitrit |
izotop dušika |
izotop dušika |
fertilizer |
nitrogen |
nitrate |
nitrite |
nitrogen isotope |
nitrogen isotope
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Šink, Nataša | 32822 |
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