Influence of plant density and term of harvest on yield and chemical composition of sweet marjoram (Origanum majorana L.)
2009
Nurzynska-Wierdak, R.,University of Life Sciences, Lublin (Poland). Dept. of Vegetable and Medicinal Plants | Dzida, K.,University of Life Sciences, Lublin (Poland). Dept. of Soil Cultivation and Fertilization of Horticultural Plants
The experiments carried out in 2006-2007 referred to the growth of marjoram plants, its yields and chemical composition depending on the plant density and harvest time. Four plant densities (setting spacing 20x40 cm, 30x30 cm, 30x40 cm and 40x40 cm) as well as two harvest times (beginning of flower bud forming and full blooming) were applied. The lowest density favored the plant tillering, which apparently affected the herb yield. Plants growing at the lowest density (40x40 cm spacing) had the largest fresh and air-dried herb yields (0.71 and 0.18 kg/square m, respectively). Herb of plants grown at denser spacing contained more total nitrogen and nitrates (V) as well as less potassium, than that of plants grown at lower density. The herb harvest at full flowering stage turned out to be favourable because of significantly lover nitrates concentration as compared to other stages. The contents of essential oil was significantly higher in the full flowering stage than in those harvested in the bud formation stage. Plants growing at denser spacing produced more oil. Trans-sabinene hydrate and terpinene-4-ol were dominating components of marjoram essential oil
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