EFFECT OF THE MINERAL FERTILIZATION ON THE YIELD AND THE OIL CONTENT OF TWO CULTIVARS OF ROSEMARY
In the years 2001-2003 two cultivars of rosemary (Majorka pink and Montfort form) were grown in peat and perlite (4:1 v/v) into plastic pots with a diameter of 22 cm. We tested the combined application of three doses of N (0100200 mg/plant), three of P2O5 (04080 mg/plant) and three of K2O (0100200 mg/plant), each applied every 20 days (25 applications during the entire cycle). For each cultivar we realized a completely randomized experimental design with eight replications. Two harvests, respectively when plants were one and two years old, were done. In both the cultivars and harvests, 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 200 N, 40 P2O5 and 200 K2O mg/plant. N, P2O5 and K2O uptakes were respectively 10.4 g, 4.04 g and 13 g per kg of dry matter, being N:P2O5:K2O = 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 -pinene, borneol and 1,8-cineole. 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, whereas P reduced it in Majorka pink and enhanced it in Montfort form. Furthermore, N and K increased -pinene, whereas P enhanced it only in Majorka pink. In both the cultivars, N enhanced linalool, camphene and myrcene, P enhanced limonene, K enhanced p-cymene and reduced 1,8-cineole. The essential oil production per kg of fresh weight was not affected by fertilization. In Majorka pink the fertilization with N, P and K increased the number of capitate glandular trichomes in comparison with the control. Non-glandular hairs were scattered in Majorka pink, whereas they formed a dense covering in Montfort form, obscuring the epidermal surface.
Martinetti, L., Quattrini, E., Bononi, M. and Tateo, F. (2006). EFFECT OF THE MINERAL FERTILIZATION ON THE YIELD AND THE OIL CONTENT OF TWO CULTIVARS OF ROSEMARY . Acta Hortic. 723, 399-404
Rosmarinus officinalis, mineral uptake, essential oil composition, glandular trichomes