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Four chamomile (Matricaria recutita L.) varieties were grown at Puumala, Finland (61°40' N, 28°15' E) in 1985—1989 from spring sowings on stony till soil, pH 5.8. The weather conditions in the experimental years were very different. For instance between 1987 and 1988 there was a difference of 5,3°C in the mean temperature of the growing periods (May- September). The four-year average of the fresh flower yield was 0.4 (0.1 —0.7) kg/m2. The yields varied greatly depending on the number of harvests, which depended on the weather conditions. One harvest could be obtained in 1986 and 1987, two in 1985 and three in 1988. In spite of the different weather conditions there were no differences in the content and composition of the essential oil distilled from the dry flowers.

Publication details, including instructions for authors and subscription information:ABSTRACT: The essential oil content and composition in two newly-bred varieties of Chammilla recutita (L.) Rausch. (the diploid "Bona" and tetraploid "NL 9 0 ) were studied during ten distinguishable phases of anthodia development. The highest essential oil content was found in young anthodia. A comparison between the diploid and tetraploid varieties reveals that the tetraploid variety was proportionally richer in chamazulene than the hploid variety during the terminal flowering stages.

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