Keywords: nitrates, nitrites, pollution of soils, soil types IntroductionStudies conducted over the last 20-25 years have confirmed the need for a thorough research of the composition and properties of soil solution, since this dynamic component of the soil is particularly sensitive to the changes caused by different factors, and can therefore be used as a criterion for measuring the risk of overloading each of agroecosystems' components -soil, vegetation and waters [1,2].