Iron content and qualitative composition in a waterlogged agricultural soil under long-term agrogenic influence, Western Ukraine

Y. Olifir¹*, T. Partyka¹, O. Havryshko¹, H. Konyk¹, H. Panakhyd¹, N. Kozak¹ and V. Ivaniuk²

¹Institute of Agriculture of Carpathian Region of National Academy of Agrarian Sciences of Ukraine, 5, Hrushevskoho Str., UA81115 Obroshyne, Lviv region, Ukraine
²Stepan Gzhytskyi National University of Veterinary Medicine and Biotechnologies, 1, Volodymyra Velykoho Str., UA80381 Dublyany, Lviv region, Ukraine
*Correspondence: olifir.yura@gmail.com

Abstract:

Iron, a typomorphic element of hydromorphic and semi-hydromorphic soils, significantly influences soil formation processes. Despite being relatively well studied, there is a lack of data on the content of its mobile compounds in Albic Pantostagnic Luvisol. Therefore, the study’s main objective is to determine the amount, profile distribution, and seasonal dynamics of Fe compounds in a waterlogged agricultural soil subjected to different levels of long-term anthropogenic influence. Research conducted in a long-term stationary experiment shows that the composition of mobile forms of iron in Albic Pantostagnic Luvisol is dominated by the oxide form Fe³⁺. The highest Fe³⁺ content (160.6 mg kg^-1) was found in the humus-eluvial layer of the control soil without fertilizer, while Fe²⁺ compounds reached 46.6 mg kg^-1 at рН_KCl 4.30. Long-term application of an organo-mineral fertilization system combined with liming by hydrolytic acidity reduced the content of mobile iron compounds to 128.0 mg kg^-1, of which Fe²⁺ accounted for 12.64 mg kg^-1 at рН_KCl 5.45. Under an identical fertilization system with liming by pH buffering capacity, the Fe²⁺ content was 28.0 mg kg^-1, with a total content of 118.0 mg kg^-1 and рН_KCl of 5.54. In the natural conditions of forest and fallow land, the highest contents of mobile iron were 231.7 and 383.1 mg kg^-1 in the 0–20 cm horizon with a significant predominance of Fe³⁺ compounds, 210.1 and 366.3 mg kg^-1, respectively.

Key words:

The content of mobile aluminium compounds depending on the long-term use of various fertilizing and liming systems of Albic Pantostagnic Luvisol

Y. Olifir¹*, A. Нabryel¹, T. Partyka¹, O. Havryshko¹, N. Kozak¹ and V. Lykhochvor²

¹Institute of Agriculture of Carpathian Region of National Academy of Agrarian Sciences of Ukraine, 5 Hrushevskoho Str., UA81115, Obroshyne, Lviv region, Ukraine
²Lviv National University of Nature Management, 1 Volodymyra Velykoho Str., UA80381, Dublyany, Lviv region, Ukraine
*Correspondence: olifir.yura@gmail.com

Abstract:

Today, climate change is exacerbating the problems of efficient and environmentally friendly use of acidic soils, which are widespread in Ukraine. At the same time, the role of mobile aluminium compounds in acidity formation is also becoming increasingly important. In this regard, chemical amelioration remains a primary and very important factor in the system of resource-saving and environmentally friendly agricultural measures for the efficient and balanced use of acidic soils. Therefore, the main objective of the research is to establish scientifically sound doses of chemical ameliorant that reduce the content of mobile aluminium compounds and ensure environmental safety and high productivity of agrocenoses on Albic Pantostagnic Luvisol. The research was carried out in a long-term stationary experiment established in 1965 with different doses of mineral fertilisers, manure and lime on an Albic Stagnic Luvisol. It was found that with a prolonged application of mineral fertilisers and the use of this soil without fertilisers, the content of mobile aluminium compounds at the end of the X rotation at pH_KCl 4.20 and 4.42 was 68.4 and 58.5 mg kg^-1 respectively. Under the organo-mineral and mineral fertilisation systems with liming with 6.0 t ha^-1 of CaCO₃ calculated by hydrolytic acidity, the content of mobile aluminium compounds decreased to 7.2 and 6.7 mg kg^-1 of soil respectively. Under identical fertilisation systems with a lime application by pH-buffering capacity (2.5 t ha^-1 CaCO₃), the content of mobile aluminium compounds is 10.8–10.0 mg kg^-1 soil.

Key words:

acidity, Albic Pantostagnic Luvisol, aluminium, fertilizers