IntroductionMedicinal and aromatic plants are effective with their active ingredients (Kamel, 2000). Several essential oils of such plants have antimicrobial, carminative, chlorotic, sedative, diuretic, and antispasmodic impacts in various diseases (Maksimovic et al., 2005). Peppermint cultivars contain menthone, isomenthone, carvone, and pulegone and all these peppermint essential oils have antimicrobial characteristics. They are also used as active ingredients in toothpastes, food stuffs, soaps, creams, lotions, and perfumes (Sivropoulou et al., 1995;Baydar, 2013).Nitrogen treatments are commonly used worldwide in plant culture to improve the yields (Ladha et al., 2005). Nitrogenous and phosphorus fertilizers may also improve essential oil yield and quality of medicinal and aromatic plants (

This study aimed at investigating the effect of ontogenetic and diurnal variability on yield and quality criteria of Mentha piperita. The research was conducted in the Ordu province of Turkey for two years. The trial was established in a randomised complete block design with 3 replications according to factorial regulations. Four different harvesting periods (budding, first flowering, 50% flowering, 100% flowering) and three harvesting hours (9:00 a.m., 1:00 p.m., 5:00 p.m.) were evaluated. A significant difference was determined between the trial years in all characters examined: plant height 55.9–69.0 cm, fresh herb yield 3 236–16 438 kg/ha, drug-herb yield 1 748–2 862 kg/ha, fresh leaf yield 3 477–4 506 kg/ha, drug leaf yield 968–1 253 kg/ha, essential oil ratio 2.0–2.5% and essential oil yield that varied between 19–28 L/ha. The highest yields were obtained at the beginning of flowering in drug leaf yield and 100% flowering period for all other characteristics. Diurnal variability was statistically significant only in the rate of essential oil, and the highest rate occurred in the 9:00 a.m. harvest.

Nowadays, whitening of stained teeth has become the most popular topic in aesthetic and cosmetic dentistry. Because of the side effects of materials that were used for bleaching, in this study the effects of some plants which were used in Anatolian folk medicine on the treatment of tooth staining were examined. In this study, upper central incisors which were extracted for periodontal reasons were used. The colour values of numbered teeth were obtained and the teeth were immersed into three different essential oils of medicinal plants (Mentha piperita, Ocimum basilicum, Rosmarinus officinalis, Salvia officinalis) for different time periods (1 day, 1 week, 1 month). At the end of the immersion periods, colour measurements of all samples were made and the colour changes were analysed. Obtained data were statistically analysed by using ANOVA and Duncan test. As a result of the variance analysis, plant species and the duration of immersion was found to be statistically significant. Within the limits of this study, we can indicate that tested medicinal plants has a whitening effect by resulting significant change in tooth colour.

ÖzMentha spicata L. ve Mentha villoso-nervata L. genotiplerinin bazı uçucu yağ bileşenleri üzerine azot ve fosfor dozlarının etkilerini belirlemek amacıyla yapılan bu çalışma 2010 ve 2011 yıllarında Erzurum'da yürütülmüştür. Mentha spicata'ya ait iki (2 ve 6 no'lu) ve Mentha villoso-nervata'ya ait bir genotip (4 no'lu) ile üç azot (0, 5 ve 10 kg/da) ve üç fosfor (0, 5, 10 kg/da) dozunun kullanıldığı deneme "Şansa Bağlı Tam Bloklar Deneme Planına" göre üç tekrarlamalı olarak yürütülmüştür. Denemenin birinci yılında dekara 5 kg azot dozunda en yüksek α-pinene, β-phellandrene, β-pinene, 3-octanol oranları elde edilirken, ikinci yılında en yüksek α-pinene, β-phellandrene, β-pinene, 3-octanol ve pcymol oranları azot uygulanmamış parsellerden elde edilmiştir. En fazla ortalama değerlere göre 2010 deneme yılında α-pinene, β-phellandrene, β-pinene ve 3-octanol oranları 5 kg/da fosfor uygulamasında öne çıkarken, 2011 deneme yılında α-pinene ve β-phellandrene oranları fosfor gübrelemesi yapılmamış parsellerde tespit edilmiştir. 10 kg/da fosfor gübrelemesinde ise β-pinene ve 3-octanol ve p-cymol oranları fazla olmuştur. Kullanılan azot ve fosfor dozu ortalamalarına göre; Mentha spicata'ya ait 6 no'lu genotip, her iki deneme yılında da β-phellandrene, p-cymol, ikinci deneme yılında α-pinene ve 3-octanol oranları bakımından ön plana çıkmıştır. Mentha villoso-nervata'nın 4 no'lu genotipi ise 2010 deneme yılında diğer genotiplerden daha fazla α-pinene, β-pinene ve 3-octanol oranlarına sahip olmuştur. Mentha spicata'nın 2 no'lu genotipinde ise ikinci deneme yılında β-pinene ve 6 no'lu genotip ile birlikte en yüksek p-cymol oranı tespit edilmiştir. Anahtar kelimeler: Tıbbi bitkiler, uçucu yağ, gübreleme Effect of different nitrogen and phosphorus doses on some essential oil components of Mentha spicata L. and Mentha villoso-nervata L. genotypes AbstractThis study was carried out in Erzurum in 2010 and 2011, in order to determine the effects of nitrogen and phosphorus doses on some essential oil components of Mentha spicata L. and Mentha villosonervata L. genotypes. An experiment using three nitrogen (0, 5 and 10 kg/da) and three phosphorous (0, 5, 10 kg/da) genotypes of two Mentha spicata (number 2 and 4) and one Mentha villoso-nervata (number 4) was carried out with three replications according to the "Randomized Full Blocks Experiment Plan". Whereas the highest ratios of α-pinene, β-phellandrene, β-pinene, and 3-octanol at the dose of 5 kg of nitrogen per decare were obtained in the first year of the test, the highest ratios from parcels without nitrogen exposure were α-pinene, β-phellandrene, β-pinene, and p-cymol per decare. According to the highest mean values; α-pinene, β-phellandrene, β-pinene, and 3-octanol ratios in 2010 test year were obtained from parcels fertilised with phosphor at 5 kg/da, while the ratios from parcels without phosphor fertilisation in 2011 test year were identified as α-pinene and β-phellandrene. β-pinene and 3-octanol and p-cymol

In order to evaluate the proper concentration of plant growth hormone and the suitable plant growth hormone in Rosmarinus officinalis L., a significant fragrant, medicinal, and herbaceous plant, the study was carried out in a greenhouse setting during the vegetative period of 2022. In the experiment, peat and vermicompost mixture (3 peat / 1 vermicompost) as the rooting medium, Indole acetic acid (IAA), Indole butyric acid (IBA), and Naphthalene acetic acid (NAA) hormones as plant growth regulators and 0, 1000, 2000, 3000, 4000 ppm concentrations of these hormones were used and the Randomised Plot Experiment Design were established three times in the Multiple Comparison Test “LSD”. In seedlings removed three months after planting, properties such as seedling height (cm), number of roots (pieces), root length (cm), maximum root length (cm), number of laterals (pieces) and lateral length (cm) were examined. The highest seedling length (19.88 cm) and number of shoots (12.60 pcs), 3000 ppm concentration of Indole acetic acid (IAA), root length (16.30 cm), and 3000 ppm concentration of Naphthalene acetic acid (NAA) at the highest root length (22.82 cm) came to the fore. In terms of root number, the values found at 3000 ppm concentration of indole acetic acid (19.25 pieces) and naphthalene acetic acid (20.09 pcs) were combined into one statistical group and made up the maximum number of roots. The lateral length control seedlings statistically prevented other applications and produced the highest lateral length (1.99 cm). Therefore, it can be said that Indole acetic acid (IAA) and Naphthalene acetic acid (NAA), both of which have a concentration of 3000 ppm, are the most suited growth hormones.