Oregano is a perennial crop native to the mountains, which has been extensively cultivated in the last decade. Due to the growing interest in oregano cultivation, the aim of this study was to investigate the effect of irrigation and nitrogen fertilization on the yield of Greek oregano and the production of essential oil in order to increase the harvested yield without reducing the quality of the product. For the purposes of the study, field experiments were established in 2016 and 2017 using a factorial split-plot experimental design with main factor irrigation (I₁: rainfed, I₂: 100 % ETo) and sub factor nitrogen fertilization (N₁: 0, N₂: 150, and N₃: 300 kg ha⁻¹) under four replicates. Total yield measured by final samplings where plants were cut at 5–8 cm above ground. Essential oil content was determined, using a Clevenger-type distillation apparatus. Irrigation had not a significant effect on yield, with irrigated treatments producing almost the same yield with the rainfed treatments (3650 and 3250 kg ha^-1, respectively), probably due to the satisfactory precipitation during the growing period. In addition, nitrogen fertilization had a significant effect on yield and on essential oil. The higher yield and essential oil production were found for the irrigated and fertilized with the higher nitrogen testing amount (I₂N₃) treatment (4750 and 275 kg ha^-1 dry leaves and flower biomass and essential oil, respectively). Therefore, Greek oregano seems to be a promising cultivation in areas characterized by a typical Mediterranean climate with satisfactory precipitation (>250 mm) during growth period, characterized by satisfactory yields.

牛至是多年生山地作物，近十年来已广泛种植。由于对牛至栽培的兴趣与日俱增，本研究的目的是研究灌溉和氮肥对希腊牛至产量和精油产量的影响，以便在不降低产品质量的情况下增加收获的产量。为了研究的目的，于2016年和2017年使用因子分解图实验设计进行了田间试验，其中主要因子灌溉（I ₁：雨水喂食，I ₂：100％ETo）和次要元素氮肥（N ₁：0 ，N ₂：150和N ₃：300 kg ha ^-1），一式四份。通过最终取样（在离地面5–8 cm处切割植物）测得的总产量。使用Clevenger型蒸馏装置测定精油含量。灌溉对产量没有显着影响，灌溉处理与雨养处理的产量几乎相同（分别为3650和3250 kg ha ^-1），这可能是由于生长期间的降雨令人满意。另外，氮肥对产量和精油有显着影响。通过较高的氮测试量（I ₂ N ₃）处理（4750和275 kg ha ^-1），发现灌溉和施肥的产量和精油产量更高。干叶和花朵生物质和精油分别）。因此，在以典型的地中海气候为特征的地区，希腊牛至地区似乎是一种有前途的耕作方式，其生长期的降水量（> 250 mm）令人满意，单产令人满意。