Uman NUH | today: 05/20/2019

Changes in the structure of the potassium stock of podzolized chernozem after a long-term fertilization

Author(s) Hospodarenko G.M., Doctor of Agricultural Sciences, Professor, Uman National University of Horticulture, Ukraine
Nikitina O.V., , , Uman National University of Horticulture, Ukraine
Prokopchuk I.V., Candidate of Agricultural Sciences, Associate Professor of Soil Science and Agricultural Chemistry, Uman National University of Horticulture
Category The Agronomy
year 2019 issue Випуск 94 Частина 1
pages 43-49 index UDK 631.412:416.4
DOI 10.31395/2415-8240-2019-94-1-43-49 (Link)
Abstract The data on the total potassium content show only its total reserves in the soil. The fine-textured soils contain more of it. This results from the fact that potassium is a part of minerals which are represented by silt fractions. The total potassium content in the soil does not always characterize the reserves of the plant. Under various conditions that violate the stability of the content of potassium forms, the soil tries to return to a stable equilibrium. High total reserves allow to maintain the genetic status of the soil according to the principle of ecosystem homeostasis by transforming compounds of this element. Research has shown that the content of total potassium in areas without the use of fertilizers in the soil layer of 0–20 cm was high (2.20). The content of total potassium in the soil slightly varies over time and in the course of its agricultural use. A long-term application of even a triple dose of mineral fertilizers (135 kg K2O / ha of rotation area) did not contribute to a significant increase in the total potassium content in the soil. Long-term systematic use of organic and mineral fertilizers, both separately and jointly during five rotations of the 10-field rotation area, contributed to an increase in the content of all forms of potassium in the soil. In the variant without fertilizers and in the variants of the first level of the fertilizer systems under study there was a low ratio of all forms of potassium to its total content. When fertilizers are applied to the podzolized chernozem, the proportion of ready soluble potassium compounds with regard to the active form of this element increases significantly. From the data obtained, it can be concluded that the potassium stock of podzolized chernozem undergoes noticeable changes with a long-term systematic application of mineral and organic fertilizers. The use of fertilizers predetermines the creation of a stable balance of potassium exchange processes between the available and non-exchangeable forms in the soil. Growing crops without the use of potassium fertilizers can significantly reduce their yield. Therefore, the application of potassium fertilizers is a required component of environmental management and conservation of soil fertility.
Key words podzolized chernozem, total potassium, potassium stock, active forms of potassium.
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