Speaker
Description
In agricultural cropping systems, the larger part of the carbon is stored in the soil. Improving agricultural practices has great potential to increase the amount of carbon sequestered in cropland soil. Promising approaches in recent years are changes in management practices and biochar application. We conducted soil CO2 emissions (SCO2) measurements on four identical plots with different management practices (tillage, no-tillage, biochar, no-biochar) during two growing seasons (2021 and 2022) on a rotational cropping soil, the first crop was sugar beet and the second crop was maize. In all the investigated management during both growing seasons, SCO2 showed a positive correlation with soil temperature but not with soil water content. The highest and the lowest SCO2 were measured at the conventional tillage management with biochar application (10.7 umolCO2m-2s-1) and no-tillage management without biochar application (0.4 umolCO2m-2s-1 ), respectively, both during the maize crop cover. The SCO2 coefficient of variation (CV) ranged between 0.4 – 0.6 for both growing seasons. The Kruskal-Wallis test did not reveal a statistically significant difference between treatments. However, the Dunn test showed a relevant difference in the R10 value and the Q10 coefficient between management in both investigated years. Nevertheless, in our study, the highest calculated SCO2 (up to 26 tha-1) was obtained at the maize plantation in the conventional tillage without biochar application management, indicating that this kind of soil agricultural management is not appropriate when SCO2 is taken into account.
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