o:3716 Carbon stocks, sequestration rate and efficiency over 50 years 2 of increasing mineral N fertilization en Abstract: Microbially mediated soil organic matter is an extremely sensitive pool that indicates sub-12 tle changes in the quality parameters. Calculation of different carbon pools (organic carbon – OC, 13 labile carbon – PMC, light carbon – LFC and microbial carbon – MBC), their sequestration rate (Csr) 14 and efficiency (Cse) as affected by 50 yrs. of mineral fertilization was done. C sequestration rate 15 between the fertilized plots were not significantly different except for the control plot. The sensitiv-16 ity index, which indicates the response of soil organic matter to changes in different carbon fractions, 17 demonstrated a strong correlation with the amount of light-fraction organic matter (OM). Use of 18 mineral N over 50 years resulted in increase of soil labile C, but not resulted in greater C sequestra-19 tion efficiency. The results give a deeper insight into the behavior of carbon pools and can serve as 20 a reliable basis for further researches focused on neutral carbon emissions and effective C seques-21 tration. 1552099 10.3390/IECAG2023-15756 2024-01-12T11:01:50.533Z 44 no 46 Elmira Saljnikov Institute of Soil Science 46 Nikola Koković Institute of Soil Science 46 Tara Grujić Institute of Soil Science 46 Ljubomir Životić Institute of Soil Science 46 Jojević Sonja Tošić Institute of Soil Science 46 Vojislav Lazović Institute of Soil Science 46 Goran Jačimović application/pdf 310117 https://unilib.phaidrabg.rs/o:3716 no yes 1 70 92000004 71A05 BOOK OF PROCEEDINGS The 3rd International Electronic Conference on Agronomy session Agro-ecology innovation to re-invent cropping and grazing systems 2023