# Carbon Storage Potential and Carbon Dioxide Emissions from Mineral-Fertilized and Manured Soil
## 3 Results
### Relationship between CO\({}_{2}\)-C Soil Emissions and Environmental Factors  
In the first year of the study, the soil CO\({}_{2}\)-C emissions were positively correlated with the precipitation ([PERSON]'s rank correlation coefficient r\({}_{\rm s}\) 0.3), and in the second year (above-average rainfall in May and June), the soil CO\({}_{2}\)-C emissions were negatively correlated with the precipitation (r\({}_{\rm s}\)\(-\)0.14). In both years, the CO\({}_{2}\)-C soil fluxes were positively correlated with the air temperature (r\({}_{\rm s}\) 0.44).  
Figure 4: Daily CO\({}_{2}\)–C soil emissions under the CaNPK and Ca + M treatments over the measurement period.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \multicolumn{3}{c}{**1 st Year**} & \multicolumn{3}{c}{**2 nd Year**} \\ \cline{3-5}
**Treatment** & & \multicolumn{3}{c}{**CO\({}_{2}\)–C Soil Emissions**} \\ \cline{3-5}  & & **Daily** & **Cumulative** & **Daily** & **Cumulative** \\ \cline{3-5}  & & \multicolumn{3}{c}{**kg CO\({}_{2}\)–C ha\({}^{-1}\)**} \\ \hline \multirow{3}{*}{CaNPK} & Mean \(\pm\) SD & 17.00 \(\pm\) 16.39 & 3933.1 \(\pm\) 356.6 & 16.01 \(\pm\) 11.89 & 2975.0 \(\pm\) 153.1 \\  & Median & 11.96 \({}^{\rm a}\) & 38062 & 12.03 \(\pm\) & 2981.3 \\  & Min-Max & 3.00–108.58 & 3519.3–4333.9 & 0.93–64.23 & 2773.2–3199.6 \\ \hline \multirow{3}{*}{Ca + M} & Mean \(\pm\) SD & 24.09 \(\pm\) 15.37 & 5365.0 \(\pm\) 113.9 & 27.56 \(\pm\) 19.83 & 5149.2 \(\pm\) 89.3 \\  & Median & 19.39 \({}^{\rm b}\) & 5369.0 & 21.85 \({}^{\rm b}\) & 5149.2 \\ \cline{1-1}  & Min–Max & 3.57–81.47 & 5212.0–5524.3 & 1.85–100.64 & 5062.1–5264.2 \\ \hline \hline \end{tabular} Different letters (a, b) in the column indicate significant differences (\(p<0.05\)). SD—standard deviation.  
\end{table}
Table 3: Daily and cumulative CO\({}_{2}\)–C emissions from the soil in the CaNPK and Ca + M treatments under a rye monoculture over the measurement period.  
In the first year of the study, CO\({}_{2}\)-C soil emissions were more strongly correlated with the content of the SOC in the E soil horizon (26-45 cm) than with its content in the Ap (0-25 cm) and Bt (<45 cm) soil horizons (Table 4). In the second year, the cumulative CO\({}_{2}\)-C soil emissions were more strongly correlated with the SOC content in the Ap horizon than with its content in the E and Bt soil horizons.  
In both years, the cumulative CO\({}_{2}\) soil emissions were positively correlated with the content of the DOC across the soil horizons (Table 4). The cumulative CO\({}_{2}\)-C soil emissions recorded in the first year were more closely related to the content of the DOC found in spring in the Ap and Bt soil horizons than with its content found in the autumn in the E, Ap, and E soil horizons and the spring in the E soil horizon. In the second year, the cumulative CO\({}_{2}\)-C soil emissions were positively and more strongly correlated with the content of the DOC measured in the spring in the Bt soil horizon than with its content in the E soil horizon in the spring; its content found in the autumn in the Ap, E, and Bt soil horizons; or its content found in the Ap soil horizon in the spring.