Nachweis des Strohabbaues über die Stickstoffreisetzung aus 15N-markiertem Stroh |
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| Authors: | H Peschke S Dölling |
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| Institution: | Institut för Grundlagen der Pflanzenbauwissenschaften, Invalidenstraße 42, D-10115 Berlin, Deutschland. |
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| Abstract: | Ten charges of 15N-labelled straw with different C/N ratios were incubated with lightly loamed sand at 25 °C and 50 % of the maximum water capacity. At the start of the 18-week incubation, mineral nitrogen was added and the 15Nmin (NH4 and NO3-N) content was determined six times during the course of the experiment. A slow release of 15N was observed. After 111 days, between 2.5 and 13.0% of the total applied 15N was mineralized. The addition of ammonium sulphate caused an increasing degradation of organic N compounds of the straw material even during the first weeks. Finally, between 6.4 and 33.3 %15N was released. The 15N release only partially shows the straw degradation. |
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| Keywords: | Straw nitrogen 15N-label incubation experiment |
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