Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 2
Written by Roman TRUSKAVETSKY, Viktoriia ZUBKOVSKA, Iryna KHYZHNIAK
It is highlighted the dynamics features and the importance of soil solution in plant nutrition in the main genetically contrasted soil kinds of Ukraine. It is shown that soil solution is the most sensitive indicator of plant nutrition and changes in reaction and in concentration of nutrient elements in it make quick impact on plant growth. Optimal concentration of phosphorus and potassium ions in soil solution was revealed in set of vegetation experiments with oat and barley. Soils with high buffer mobilization capacity can compensate the deficit of a large part of these ions while mineral nutrition of plants is ongoing. In contrast, soil solution becomes poor on biogenic elements in soils with low buffer capacity. Processes of immobilization and mobilization of biogenic elements are regulated by bio-organo-mineral complex, which specifies a dynamics pattern of the fertility element concentration in soil solution. This pattern is described by buffer curve in relation to the curve of bufferless substrate. The more distance between these curves the higher buffer capacity in investigated soil.
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