Der Stickstoffexport der Wurzel und die Zusammensetzung des Xylemexsudats <p>Teil 1: Der Einfluß einer zunehmenden Stickstoffdüngung</p>

Authors

  • G. Alleweldt
  • N. Merkt

DOI:

https://doi.org/10.5073/vitis.1992.31.121-130

Keywords:

nitrogen, xylem exudate, grapevine, rootstock, fertilization, root, nutrition

Abstract

The nitrogen output of the root and the nitrogenous compounds in the xylem exudate.
Part 1: The influence of increasing nitrogen fertilization

Two-year-old two-bud cuttings in pots supplied with two levels of nitrogen (0.5 and 3.0 g N/vine) were tested for dry mass production, N uptake and the N composition in the xylem exudate.
The rootstock 125 AA showed the highest dry mass production, Silvaner the lowest one. Both N output of the root (calculated from the N content of the xylem sap) and the N uptake/vine are analogous to dry mass production, the N uptake being 595 resp. 2003 mg N for 125 AA, 245 resp. 1403 mg N for Silvaner and 423 resp. 1363 mg N for C 3309 (N fertilization 0.5 and 3.0 g N/vine, resp.).
N is transported within the xylem as NO3-N and NH2-N. The proportion of NO3-N depends much on the N fertilization (4-25 % NO3-N at low and 16-42 % at high N fertilization). The N composition in the xylem exudate does not depend on grape variety. With 66 % glutamine is the main transport form.

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Published

2015-10-08

Issue

Vol. 31 No. 3 (1992): Vitis

Section

Article

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