Maksim L. Burdukovskii
Bulletin of higher educational institutions. North Caucasus region. Natural sciences 2026; (2-1): 69-74
Dark-humus podbels of Primorsky region are characterized predominantly by elevated or high content of mobile potassium forms. The potassium regime of postagrogenic soils of the region has not been studied so far. The aim of this work is to study the dynamics of the content of mobile potassium forms and their stocks in abandoned and arable dark-humus podbels of the southern Primorsky region. The study was carried out on abandoned lands aged 15, 20, 35, and 80 years; as a control, samples from modern arable land were used. It was established that at the early stage of postagrogenic development in the upper horizon of agro-dark-humus podbels, there occurs an increase in the content of mobile potassium. After 20–35 years following the withdrawal of soil from agricultural use, a pronounced decrease of mobile potassium is observed in the humus horizon; the stocks significantly decrease throughout the profile as a whole. By the 80th year, a partial stabilization of the potassium regime is observed, however, the upper stratum remains poorer than arable land. The results have applied significance for the assessment of the fertility potential of abandoned lands and for planning their possible involvement in agricultural use.
