At present, there is a lack of data on changes in the elemental composition of components of agrocenoses under the influence of chemicalization agents during the growing season. The aim of the work was to assess changes in the elemental composition of the soil-plant system in different periods of plant vegetation under conditions of mineral fertilizers application on sod-podzolic loamy soil (Stagnic Podzols (Pantoarenic, Bathyloamic, Abruptic, Aric)). Determination of the content of mobile forms of Fe, Mn, Ni, Cu, Co and Zn was carried out in soil samples of the field experiment in the Tver region, taken at different stages of vegetation of winter rye plants during one season – in October (sprouting), April (tillering), June (earing), August (full ripeness). The content of elements in conjugated samples of rye plants was estimated. It was shown that the period of sampling can have a significant influence on the results of assessing the content of mobile forms of elements. An increase in the content of Mn and Zn in the aboveground organs of rye plants was revealed for samples taken at the stage of sprouting with an increase in the dose of mineral fertilizers. It is shown that the values of the content of mobile forms of elements in the soils of the field experiment weakly correlate with the values of the content of elements in the aboveground organs of plants.
A. D. Kotelnikova (Wed,) studied this question.