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Distribution of15N ...
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Lindberg, T.Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden
(författare)
Distribution of15N in the soil-plant system during a four-year field lysimeter study with barley (Hordeum distichum L.) and perennial meadow fescue (Festuca pratensis Huds.)
- Artikel/kapitelEngelska1989
Förlag, utgivningsår, omfång ...
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Dordrecht, Netherlands :Kluwer Academic Publishers,1989
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LIBRIS-ID:oai:DiVA.org:oru-52230
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https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-52230URI
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https://doi.org/10.1007/BF02370266DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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An annual cereal, barley, and a perennial grass ley, meadow fescue, were grown in field lysimeters in Sweden and fertilized with 12 and 20g Ca(NO3)2-N m-2 yr-1, respectively. Isotope-labeled (15N) fertilizer was added during year 1 of the study, whereafter similar amounts of unlabeled N were added during years 2 and 3. The grass ley lysimeters were ploughed after the growing season of year 3 and sown with barley during year 4. The barley harvest in year 1 removed 59% of the added fertilizer N, while the fertilizer N export by two meadow fescue harvests in year 1 was 65%. The labeled N export decreased rapidly after year 1, especially in the barley, but increased slightly after ploughing of the grass ley.The microbial biomass, measured with the chloroform fumigation method, incorporated a maximum of 1.4-1.7% of the labeled N during the first seven weeks after application. Later on, the incorporation stabilized at less than 1% in both cropping systems.The susceptibility of the residual labeled N to mineralization was evaluated three years after application by means of long-term laboratory incubations. The curves of cumulative mineralized N were described by a two-component first-order regression model that differentiated between an available and a more recalcitrant fraction of potentially mineralizable N. There was no difference in the amounts of potentially mineralizable N between the cropping systems. The labeled N comprised 5 and 2% of the amounts of potentially mineralizable N in the available and more recalcitrant fraction, respectively. The mineralization rate constants for the labeled N were almost twice as high as for the total potentially mineralizable N. The available fraction of the total potentially mineralizable N was 12%, while twice that proportion of the labeled N was available.It was concluded that the short-term ley did not differ from the annual crop with respect to the early disposition of the fertilizer N and the behaviour of the residual organic N.
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Bonde, T. A.Department of Water and Environmental Studies, University of Linköping, Linköping, Sweden
(författare)
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Bergström, L.Department of Soil Science, Division of Water Management, Swedish University of Agricultural Sciences, Uppsala, Sweden
(författare)
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Pettersson, R.Division of Agricultural Ecology, Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden
(författare)
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Rosswall, T.Department of Water and Environmental Studies, University of Linköping, Linköping, Sweden
(författare)
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Schnürer, Johan,1957-Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden(Swepub:oru)jhsr
(författare)
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Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, SwedenDepartment of Water and Environmental Studies, University of Linköping, Linköping, Sweden
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Plant and SoilDordrecht, Netherlands : Kluwer Academic Publishers119:1, s. 25-370032-079X1573-5036
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