Abstract
The study was carried out in order to assess the agrotechnological potential of organic carbon management in arable soil: medium thick, micellar-carbonate, heavy loamy ordinary chernozem. The work was carried out in a long-term experiment of the Geographical Network of Field Experiments with Fertilizers, founded in 1974 by the Federal Rostov Agricultural Research Center. The dynamics of organic carbon in three contrasting treatments of the experiment were studied during five rotations over a 40-year period. Based on experimental data for 1975–2011, the monthly dynamics of organic carbon stocks in each treatment of the experiment until 2020 was reproduced using dynamic modeling. The model describes the observed decrease in organic carbon stocks after five crop rotations in all treatments of the experiment. At the same time, there was an increase in C stocks during the first three rotations against the background of the organo-mineral fertilizer system. However, the accumulated carbon was later lost, which indicates the nonequilibrium of stocks and their significant dependence on crop rotation productivity, which manifests even during one rotation. At the same time, interannual variability over a 9-year rotation could exceed 4 t/ha or approximately 5% of the total stocks. Based on the modeling, it was found that the input of C with plant residues necessary to maintain organic carbon stocks in the arable layer of the soil is 3.87 t/ha per year on average. The annual accumulation of organic carbon in the amount of 0.4‰ from the initial stocks of 88 t/ha in the first 20 years ensured the joint application of the highest rates of mineral and organic fertilizers. The “4 ppm” strategy can be implemented in ordinary chernozem under the conditions of the experiment under consideration with an annual input of 4.3–5.7 t/ha C of plant residues. The application of high rates of organic fertilizers that ensure the mentioned productivity is a necessary component of maintaining and increasing the stocks of organic carbon in soils.
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Khusniev, I.T., Romanenkov, V.A., Pasko, S.V. et al. Agrotechnological Potential of Organic Carbon Management in Grain-Fallow Crop Rotation on Ordinary Chernozems. Russ. Agricult. Sci. 48, 276–282 (2022). https://doi.org/10.3103/S1068367422040073
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DOI: https://doi.org/10.3103/S1068367422040073