YIELD AND THE CHEMICAL COMPOSITION OF FLOWER HEADS OF POT MARIGOLD (Calendula officinalis L. cv. Orange King) DEPENDING ON NITROGEN FERTILIZATION
2011; University of Life Sciences in Lublin; Volume: 10; Issue: 2 Linguagem: Inglês
ISSN
2545-1405
Autores Tópico(s)Agriculture, Plant Science, Crop Management
ResumoMarigold belongs to the oldest medicinal plants, which had been used in the ancient times. At present it supplies its material of a great significance for pharmaceutical and cosmetic industry. The study was conducted in the period 2007-2009 on loess soil with the granulometric composition of silt loam. The aim of the experiment was to deter- mine the effect of different nitrogen doses (0, 40, 80, 120, 160 kg N·ha -1 ) on some plant morphological features as well as on yield and quality of pot marigold inflorescences. Flowering of pot marigold was shortest in the control treatment (30 days) and longest (40 days) in the plot where nitrogen fertilization had been applied at the highest rate (160 kg N·ha -1 ). Nitrogen fertilization had a significant impact on the number of flower heads per plant, but no differences were found in inflorescence diameter under investi- gated factor. Raw material yield was found to increase significantly after the application of 80 kg N·ha -1 , compared to the control treatment. Further increase in the amount of ni- trogen (120, 160 kg N·ha -1 ) did not result in growth of yield. Nitrogen fertilization modi- fied essential oil content in flowers heads (this content increased along with increasing ni- trogen rates), but it did not affect the percentage of flavonoid compounds.
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