Study of the Effect of Organic Fertilizers in annual periwinkles (Catharanthus sp.)

Bistra Atanassova, Gergana Mladenova

Abstract: In 2018, a pot trial was carried out at the Institute of Ornamental and Medicinal Plants in a steel and glass greenhouse in order to study the effect of organic fertilizers Compovet and Cocovet on the growth and development of annual periwinkles (Catharanthus sp.). The root application of the organic fertilizers had a positive effect on the phenophases of flowering, namely 3-days earlier flowering with Compovet and 2-days – with Cocovet as well as a longer blooming period with 6 and 4 days, respectively, compared to control plants. The application of organic fertilizers Compovet and Cocovet resulted in higher values of plant height and diameter growth rate vs. control plants with 14.3% and 7.5% in Compovet and 25.4% and 12.5% in Cocovet, respectively. Compared to the mineral fertilizer Masterblend, the application of organic fertilizers resulted in lower growth rate values, except for height, where the growth rate was 2.6% higher in plants treated with Cocovet. Of the two organic fertilizers, the effect of Cocovet on plants was higher.

Keywords: Catharanthus sp.; diameter; effect; height; organic fertilizers; phenophases

Date published: 2019-10-30