Incorporation of 15N-labelled fertilizer nitrogen into upper vegetative plant parts in wheat and its mobilization during grain development

K. Berecz, K. Debreczeni, M. Presing

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The incorporation of 15N-labelled fertilizer nitrogen into the plant parts of winter wheat (Triticum aestivum L.), most important from the point of view of N-mobilization during grain development, was investigated in this study. The microplot N-fertilization experiments were carried out on an eutric Cambisol of medium N-status in Keszthely (Hungary). In addition to an unlabelled N dose of 80 kg ha-1, applied in autumn, spring doses of 15N- labelled N-fertilizer were employed. From a grain moisture content of 70% to full ripening, six harvests were done. The flag-leaf blade, flag-leaf sheath, uppermost internode, glumes, rachis and grains from 100 plants were separated each time. From the 60 kg ha-1 N-dose applied at shooting (Feekes scale 6), in addition to the 60 kg N ha-1 given at tillering (Feekes scale 2-3), the amount incorporated into the vegetative plant parts was 45% higher. The extent of the N-incorporation was 2.5-fold higher as a result of doubling of the 60 kg N-dose applied at tillering. The proportion of the 15N-fertilizer nitrogen in the total nitrogen was similar in the different plant parts, but it varied from 12.4 to 30.6% as an effect of different N-fertilizations. N- depletion of different quantity and rate from the tested vegetative plant parts could be detected. The labelled fertilizer-N mobilized from the vegetative parts above the top node accounted for 49-62% of 15N contained in the ripe grains per ear in the different N-treatments. Irrespective of the different timing or doses of N-applications, the flag-leaf blade and uppermost internode showed the greatest relative N-depletions.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalPlant Physiology and Biochemistry
Volume35
Issue number1
Publication statusPublished - Jan 1 1997

Keywords

  • Grain development
  • N field experiment
  • Triticum aestivum
  • nitrogen distribution
  • nitrogen translocation
  • vegetative plant parts

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science

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