Change in the fractional composition of carotenoids in <i>Calendula officinalis </i>L. due to nutrients the zinc and nitrogen in chernozem soil <i>(Received July 19, 2019; Revised August 29, 2019; Accepted September 18, 2019)</i>
The article considers agrochemical factors for cultivation of medicinal plants with focus on biomass increase primarily due to a role of nitrogen and zinc and change in the fractional composition and concentration of carotenoids in Calendula officinalis L. A two-year vegetative experiment with calendula of Kalta variety was carried out. Effects of Zn and Zn supplemented with N intake on morphological changes, blooming and reproduction were studied. Intake of nutrients into above-ground plant parts was studied utilizing a variety of chemical methods. The quantitative and qualitative composition of carotenoids by HPLC was established. The calculated value of the accumulation of carotenoids by plants for the entire vegetation period was performed. Data were subjected to analysis of variance (ANOVA) and means were separated by Duncan multiple range test at P < 0,05 significant level. Factors selected by us in the growing experiment, formed contrasting options which allowed to determine the most effective way to grow medicinal crops on chernozem soil.