Dosimetric control revealed a significant decrease in the background level of ionizing radiation from tap water after boiling it in various household appliances. As natural doses of ionizing radiation are known to be necessary for the normal functioning of living organisms, it has been suggested that the boiling process may have an adverse effect on the biological properties of water. To confirm or refute the indicated assumption, the seeds of barley (Hordeum vulgare) were germinated on tap water, which was boiled in one of the household appliances (microwave oven, electric kettle, ordinary kettle), and measured the length of the roots and epicotyls in 4-day seedlings. Based on the data obtained, the average values of the respective indicators were calculated. Quantitative data were obtained on representative sample sizes and are statistically significant with a probability of 0.05. Studies have shown a positive effect of boiled tap water on the average length of seedling roots. The magnitude of the effect depended on the type of device in which the boiling water was carried out. Boiled distilled water also promoted seedling root growth. Possible cause for improvement of growth qualities of water was removal or destruction in the process of boiling of gases and soluble substances which are unfavorable for the development of the plant organism
biological properties of water, boiled water, barley seedlings, phytotesting