studying the effect of seed priming on the growth and yield of marigold (calendula officinalis l.) under different levels of vermicompost

The present study aims to investigate the effect of different levels of vermicompost on the growth and yield of the essential oil of marigold plant under seed priming with azospirillum and humic acid under different levels of vermicompost on the growth and yield of marigold essential oil, factorial based on a randomized complete block design in the research farm of islamic azad university, astara branch was done. the test treatments included seed priming including azospirillum brazilense bacteria, humic acid, azospirillum + humic acid and control and different levels of vermicompost (0, 5 and 10 t ha-1). the results showed that some traits such as chlorophyll a, anthocyanin, essential oil yield and biological yield were affected by vermicompost interaction and seed priming. but plant height, number of seeds and flowers, flower weight, seed weight, essential oil amount and total chlorophyll were affected by the main effect of vermicompost, but seed priming was not significant on some of these traits. the highest amounts of chlorophyll a and total, biological yield, essential oil yield and dry weight of flowers were obtained from humic acid + azospirillum treatment under the application of 10 t vermicompost ha-1.