Abstract
Nitrogen release from intact wheat roots (Triticum aestivumn L.) into the soil was investigated at different growth stages and under two temperature regimens and flooding conditions. The influence of vanadate was also studied. Since methods used until now for such studies have their shortcomings we developed therefore a new technique: Spring wheat seedlings were at first labelled in a 15N nutrient solution and then transplanted into soil pots.
15N labelled compounds released during the entire growth period into the soil (control) amounted to 11% of the total 15N in the plant and soil at the beginning of the experiment but was significantly higher at flooding, high temperature and vanadate application (plasmalemma ATPase inhibitor). Highest release rates were found in the period from ear emergence until grain filling.
Zusammenfassung
Der durch die Wurzeln an den Boden abgegebene 15N betrug bei Vollreife 11% der 15N-Menge, die zum Experimentsbeginn in Pflanze und Boden enthalten war. Die höchste Abgaberate wurde zwischen Ährenschieben und Beginn der Kornfüllung ermittelt. Die Abgabe von 15N an den Boden war bei erhöhter Temperatur, stauender Nässe und besonders nach Applikation von Vanadat (Hemmer der Plasmalemma-ATPase) im Vergleich zur Kontrolle signifikant erhöht.
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© 1999 B. G. Teubner Stuttgart · Leipzig
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Rroço, E., Mengel, K. (1999). Abgabe von 15N an den Boden durch intakter Weizenpflanzen in der gesamten Vegetationsperiode. In: Merbach, W., Wittenmayer, L., Augustin, J. (eds) Stoffumsatz im wurzelnahen Raum. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-91134-6_13
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DOI: https://doi.org/10.1007/978-3-322-91134-6_13
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