Carbon dioxide emission and humus status of Albic Stagnic Luvisol under different fertilization regimes

Abstract

The increase in the carbon dioxide content in the atmosphere, which enhances the greenhouse effect and leads to climate change, is the fundamental scientific problem of nowadays. Modern approaches to fertility management technologies of acid soils based on the principles of resource conservation and environmental safety are presented. They are based on the results of the study of carbon dioxide emission intensity, humus status, and crop rotation productivity in a classic long-term agricultural experiment under the influence of long-term use of various fertilizer systems with the application of ameliorant doses calculated by pH buffering capacity and hydrolytic acidity. The organo-mineral fertilizer system with the addition of 10 t of manure per ha of crop rotation area + N65P68K68, liming with a CaCO3 dose calculated according to pH buffering capacity (2.5 t/ha) contributes most to the optimization of soil processes. At the same time, it ensures the rational use of fertilizers and ameliorants, preservation of fertility, optimizes the processes of humus formation and carbon dioxide release. A high level of productivity of Albic Stagnic Luvisols forms under these conditions – 7.38 t/ha of grain units. Application of 1.0 and 1.5 lime norms calculated according to soil hydrolytic acidity with organic-mineral and mineral fertilizer systems on Albic Stagnic Luvisols in a short four-field crop rotation is not only a high-cost measure. However, it causes significant carbon loss in the form of CO2 due to additional mineralization. It is accompanied by calcium leaching and creates environmental problems in the conditions of the periodic washing-off water regime. Therefore, liming by CaCO3 dose calculated according to acid-base buffering capacity should be carried out before each of the following rotations in order to harmonize the environmental and productive functions of Albic Stagnic Luvisols in the short crop rotation. The obtained research results will be used to improve the methodology for determining carbon dioxide emissions and predicting the effect of various fertilizer and liming systems on its balance in the soil.

An acid-base buffering model to describe pH buffering capacity of an acid albic stagnic luvisol under long-term agricultural land use and management

“…Our study, demonstrated that a dose of lime, calculated by acid-base buffering capacity (2.5 t/ha CaCO 3 ), introduced before the beginning of each four-fi eld rotation, is the most optimal under organic-mineral fertilization, It excludes negative consequences of modern agrotechnical management and is a prerequisite of environmental stability of the agroecosystem. In our present and previous studies, it was in the control variants and those of mineral fertilization systems only, that we observed the highest losses of carbon dioxide, especially after the soil tillage in spring and autumn (Olifi r et al, 2020). This is why accurate determination of the pH buffering capacity of soil in agriculture systems is important for the evaluation of the need for lime and forecasting the rate of soil acidifi cation (Wang et al, 2015;Wong et al, 2013).…”

“…Currently, in cooperation with National Scientifi c Centre (NSC)'s Institute for Soil Science and Agrochemistry, named after O.N. Sokolovsky at Kharkiv, we have been researching in more depth and detail the possibilities and effects of liming on the fertility and acid-base buffering capacity of acid Albic Stagnic Luvisol in the Carpathian region (Olifi r et al, 2020 and2021).…”

Influence of prolonged agrogenic transformation on soil structure and physicochemical properties of Ukrainian Albic Stagnic Luvisols: a case study from western Ukraine

“…The results obtained by Olifir et al (2020) in a long-term study provide opportunities to assess the systemic impact of various agricultural technologies on soil fertility, biotic processes, the state of the soil environment, as well as to find out the peculiarities of the circulation of substances and energy flows. In general, this will make it possible to theoretically substantiate directions for the formation of sustainable and ecologically safe functioning of agroecosystems under the conditions of global warming.…”

Intake and fixation of organic carbon in grain agrophytocenosis of Western Siberia

“…This leads to a violation of the composition of soil microorganisms and change in the intensity of the processes of organic matter mineralization and humification, which significantly changes the CO2 emission, and the deficiency of organic matter increases sharply [11]. The rapid rejection of the use of organic fertilizers [12] leads to a sharp decrease in organic matter stocks in soils and increased carbon dioxide emissions [13]. Despite the variety of literary sources, there is no clear understanding of soil organic carbon dynamics depending on agrotechnological methods of cultivation of agricultural crops.…”