Sökning: AMNE:(LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Jordbruksvetenskap)
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Distribution of15N ...
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.)
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- Lindberg, T. (författare)
- Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Bonde, T. A. (författare)
- Department of Water and Environmental Studies, University of Linköping, Linköping, Sweden
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- Bergström, L. (författare)
- Department of Soil Science, Division of Water Management, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Pettersson, R. (författare)
- Division of Agricultural Ecology, Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Rosswall, T. (författare)
- Department of Water and Environmental Studies, University of Linköping, Linköping, Sweden
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- Schnürer, Johan, 1957- (författare)
- Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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(creator_code:org_t)
- Dordrecht, Netherlands : Kluwer Academic Publishers, 1989
- 1989
- Engelska.
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Ingår i: Plant and Soil. - Dordrecht, Netherlands : Kluwer Academic Publishers. - 0032-079X .- 1573-5036. ; 119:1, s. 25-37
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Jordbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Agricultural Science (hsv//eng)
Nyckelord
- barley; fertilizer efficiency; leaching; meadow fescue; microbial biomass; nitrate fertilizer; 15N; plant uptake; potentially mineralizable nitrogen
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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