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Valtcho D. Zheljazkov, Vasile Cerven, Charles L. Cantrell, Wayne M. Ebelhar, and Thomas Horgan

harvested area of ≈32,076 ha ( USDA, NASS, Crop Report, 2007 ). The U.S. peppermint oil is considered of high quality and U.S. essential oil broker companies have dominated the peppermint essential oil market. The essential oil content and composition of

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Valtcho D. Zheljazkov, Tess Astatkie, and Ekaterina Jeliazkova

that ‘Native’ spearmint can be grown in a wide range of environments outside the traditional spearmint production areas and produce desirable yields and oil composition ( Zheljazkov et al., 2010a , 2010b , 2012 , 2013 ). Spearmint oil content in

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Valtcho D. Zheljazkov, Tess Astatkie, Thomas Horgan, Vicki Schlegel, and Xavier Simonnet

, 1973 ). Like with other aromatic plants, A. annua essential oil content and composition is modified by genotype and the environment ( Tzenkova et al., 2010 ), by distillation method ( Scheffer, 1993 ), and by other factors. A recent report ( Ferreira

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Valtcho D. Zheljazkov, Tess Astatkie, Barry O'Brocki, and Ekaterina Jeliazkova

) and has been explored as a food preservative and for decreasing aflatoxin B1 in maize grain ( Bluma and Etcheverry, 2008 ). Anise seed essential oil content and composition vary depending on the environment and the genotype ( Leela and Vipin, 2008

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Valtcho D. Zheljazkov, Charles L. Cantrell, M. Wayne Ebelhar, Dennis E. Rowe, and Christine Coker

et al., 2004a , 2004b ; Yassen et al., 2003 ) on sweet basil productivity and oil composition. Sulfur is another macronutrient with important functions in plants. It is a part of plant proteins as a component of the amino acids cysteine and

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Valtcho D. Zheljazkov, Tess Astatkie, Santosh Shiwakoti, Shital Poudyal, Thomas Horgan, Natasha Kovatcheva, and Anna Dobreva

distillation ( Topalov, 1962 ). Although there are numerous reports on garden sage essential oil composition, there is no agreement in the literature regarding the optimal steam DT for the extraction of the essential oil from garden sage biomass. We

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Valtcho D. Zheljazkov, Tess Astatkie, and Ekaterina Jeliazkova

( Adams, 1979 ), and duration of distillation time ( Zheljazkov et al., 2012a , 2012b ) can affect Rocky Mountain juniper essential oil composition. However, there are no reports on variations of Rocky Mountain juniper essential oil year-round, from

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Valtcho D. Zheljazkov, Tess Astatkie, and Vicki Schlegel

factors, as reviewed recently by Figueiredo et al. (2008) . It has been demonstrated with some other essential oil species that the length of the DT may affect essential oil yield and composition, but not oil bioactivity ( Cannon et al., 2012

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Santosh Shiwakoti, Henry Y. Sintim, Shital Poudyal, Jennifer Bufalo, Charles L. Cantrell, Tess Astatkie, Ekaterina Jeliazkova, Lyn Ciampa, and Valtcho D. Zheljazkov

harvest representing the stage of development of the crop on Japanese cornmint in the south of the United States ( Zheljazkov et al., 2010b ), there is no information on how harvest time within a 24-h period would affect oil concentration and composition

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Yingchao Lin, Dejun Kong, Zhihong Wang, Yi Chen, Zhixiao Yang, Chun Wu, Hui Yang, and Lili Chen

demonstrated previously, N application can affect the seed yield, oil content, and composition of other crops such as wheat, sunflower, and winter mustard ( Li et al., 2019 ; Zheljazkov et al., 2009 ). Significant differences in the fatty acid composition were