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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.)
Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Water and Environmental Studies, University of Linköping, Linköping, Sweden.
Department of Soil Science, Division of Water Management, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Division of Agricultural Ecology, Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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1989 (English)In: Plant and Soil, ISSN 0032-079X, E-ISSN 1573-5036, Vol. 119, no 1, 25-37 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Dordrecht, Netherlands: Kluwer Academic Publishers, 1989. Vol. 119, no 1, 25-37 p.
Keyword [en]
barley; fertilizer efficiency; leaching; meadow fescue; microbial biomass; nitrate fertilizer; 15N; plant uptake; potentially mineralizable nitrogen
National Category
Forest Science Agricultural Science
Identifiers
URN: urn:nbn:se:oru:diva-52230DOI: 10.1007/BF02370266ISI: A1989AR78600004ScopusID: 2-s2.0-0004501002OAI: oai:DiVA.org:oru-52230DiVA: diva2:971192
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2016-09-15Bibliographically approved

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