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| NPK fertilizers on Rosmarinus officinalis | |
| The effects of different NPK fertilizer applications were tested on two cultivars of Rosemary (“Majorka pink” and “Montfort form”). Plants were grown in peat and perlite (4:1 v/v) in 22cm diameter plastic pots. N, P and K enhanced yield, but only N had a significant effect on the height and the diameter of the plants. The best fertilizer combination was 200mg N, 40mg P (P2O5) and 200mg K perplant. N, P2O5 and K2O uptakes were respectively 10.4 g, 4.04 g and 13 g per kg of dry matter, represeting a ratio of 2.5:1:3.2. Oil content and composition were different in the two cultivars: “Majorka pink” had the highest oil content and was particularly rich in camphor; “Montfort form” in alpha-pinene, borneol and 1,8-cineole. The essential oil production per kg of fresh weight was not affected by fertilization. Fertilization had different effects on the oil composition of the two cultivars, particularly on the percentage occurrence of borneol and oxygenated compounds. N and K always reduced camphor content, N enhanced linalool, camphene and myrcene, P enhanced limonene, K enhanced p-cymene and reduced 1,8-cineole. ‘Effect of the mineral fertilization on the yield and oil content of 2 cultivars of Rosemary by L. Martinetti, E. Quattrini, M. Bononi, F. Tateo. ISHS Acta Horticulturae 723: I International Symposium on the Labiatae: Advances in Production, Biotechnology and Utilisation. www.acthort.org |
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