NITROGEN PARTITIONING IN POTTED CHRYSANTHEMUM AS INFLUENCED BY SOURCE AND QUANTITY OF N SUPPLIED
| Autor: | M. James Tsujita, William N. MacDonald, Theo J. Blom |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | HortScience. 27:687d-687 |
| ISSN: | 2327-9834 0018-5345 |
| Popis: | Chrysanthemum morifolium Ramat. cv. `Yellow Favor' was grown single stem in 10cm pots on an ebb and flow benching system. A 2×2 factorial design was employed with 2 sources of N (100 NO3 and 50 NO3 :50 NH4+), delivered at 18 mM, and 2 quantities of N supplied, (200 mg and 400 mg), with 200 mg supplied by wk 3 and 400 mg supplied by wk 5. Plants were harvested at two wk intervals, separated into leaves, stems plus petioles and inflorescence (when developed) and analyzed for total and NO3- N, with reduced N being estimated as the difference between these two values. Plant tissue (leaves and stems plus petioles) NO3- levels showed similar trends for the 200 and 400 mg N supply, with a maximum at the 4th to 6th wk. At flowering, (wk 10) significant tissue NO3- levels were found only in plants supplied 400 mg of N. Plants supplied with 50:50 NH4+: NO3- initially had significantly greater reduced N and leaf area than NO3- supplied plants, although differences diminished towards flowering. During floral development (wk 8 to 10), at which time no additional N was accumulated by the plant, significant amounts of reduced N was remobilized from the stem plus petioles and leaves to the developing inflorescence. |
| Databáze: | OpenAIRE |
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