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The influence of different levels of basic fertilization and nitrogen top-dressing on the herb and oil yield of dill (Anethum graveolens L.) was studied in 1984 and 1985 in Finland. The total nitrogen doses were 0, 15, 30, 40, 80, 120 and 160 kg/ha. The crop in 1984 yielded 12 000—34 000 kg/ha fresh dill herb and 10.3—21.1 kg/ha essential oil. The figures in 1985 were 10600—21 000 and 9.4—16.6 kg/ha, respectively. Of the 22 volatile components identified by gas chromatography mass spectrometry, the four most abundant compounds were analysed quantitatively. These compounds were a-phellandrene, 3,6-dimethyl-2,3,3a,4,5,7a-hexahydrobenzofuran, β-phellandrene and limonene, composing 70—95 % of the total aroma content. The optimum basic fertilization for the herb yield proved to be a compound fertilizer of the rate of 40-16-68 kg NPK/ha. The small nitrogen doses (30—40kg N/ha) gave also good results in respect to oil yield and the amount of 3,6-dimethyl-2,3,3a,4,5,7a-hexahydrobenzofuran, the most important aroma compound in the dill herb.

Studies on fertilization of dill (Anethum graveolens L.) and basil (Ocimum basilicum L.): II Oil yield of dill affected by fertilization