Humic Acid Improves Plant Yield, Antimicrobial Activity and Essential Oil Composition of Oregano (Origanum vulgare L. subsp. hirtum (Link.) Ietswaart)

The effects of humic acid on plant yield, essential oil content, the composition and antimicrobial activity Origanum vulgare L. subsp. hirtum (Link.) (cv. Tinmaz) cultivated in 2017 2018 under Eskisehir ecological conditions were evaluated. Three (HA) doses response to 50.0 L ha?1 (HA 50), 30.0 30) 0.0 0, as control) applied soil at vegetative stage beginning blooming throughout each harvest both years. Essential was determined using GC-FID/GC-MS. antibacterial antifungal by well-diffusion method. Fresh herb dry yield leaf highest HA 50 years, although content increased 30, but greatest second year. differences between control dose 0.46% 0.42% 2018, respectively. samples against two bacteria species (Enterococcus faecalis Staphylococcus aureus) yeast (Candida albicans Candida parapisilosis) generally higher than that drugs, with increasing doses. Analysis components showed carvacrol ?-Terpinene ratios ha?1. Soil applications could be recommended for quality, hirtum.