## 3 Results
It was observed that the required times of 1/2 the maximum amount of accumulated PO\({}_{4}\)-P were taken from 12.6 to 15.9 days, regardless of the blended biochar pellet uploaded with different nutrient solutions, but that they were taken from 20.1 days in the PMCP (Table 5). The accumulated K concentrations rapidly increased until 7 days of precipitation, and then remained in a steady state through 30 days of precipitation, regardless of the treatment (Figure 3). The study showed that the highest accumulated K concentration was 2680.5 mg L\({}^{-1}\) in the TNPK, and that the lowest was in the TN and HTN which unloaded with plant nutrient solutions, even though those mixed with 60% of pig manure compost were 1729.0 and 1754.5 mg L\({}^{-1}\), respectively. The estimation model for K releases from different blended biochar pellets calculated using a modified hyperbola equation is presented in Table 6. The required times of 1/2 maximum accumulated K amount were taken less than 0.6 days in all the treatments because of a high water-soluble capacity (Table 6). Figure 3: Releasing curves of K from the blended biochar pellet uploaded with plant nutrient solutions. The results are the mean of triplicate samples and error bars indicate standard deviation. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Treatments *} & \multicolumn{3}{c}{**Model Parameters**} & \multicolumn{3}{c}{**Analysis of Variance**} & \multirow{2}{*}{**R\({}^{2}\)**} \\ \cline{2-2} \cline{5-6}  & **Amax** & & & **\(p\)-Values** & & **t\({}_{\text{1/2(Amax)}}\)** \\ \hline TN & 1150.0 & \textless{}0.0001 & 15.9 & \textless{}0.0001 & 2454.8 & \textless{}0.0001 & 0.979 \\ HTN & 1040.6 & \textless{}0.0001 & 14.3 & \textless{}0.0001 & 1436.4 & \textless{}0.0001 & 0.965 \\ TNPK & 1071.1 & \textless{}0.0001 & 12.6 & \textless{}0.0001 & 2204.4 & \textless{}0.0001 & 0.977 \\ HTNPK & 1106.7 & \textless{}0.0001 & 13.8 & \textless{}0.0001 & 2496.4 & \textless{}0.0001 & 0.980 \\ PMCP & 1122.0 & \textless{}0.0001 & 20.1 & \textless{}0.0001 & 750.9 & \textless{}0.0001 & 0.935 \\ \hline \hline \end{tabular}  
* TN, uploaded with urea solution at room temperature, HTN; urea solution heated to 60 \({}^{\circ}\)C, TNPK; N, P and K solutions at room temperature, HTNPK; N, P and K solutions heated to 60 \({}^{\circ}\)C and PMCP; pig manure compost pellet as control. Means values indicate significant differences (\(p<0.001\)) among treatments (ANOVA).  
\end{table} 
Table 5: Estimation model for PO\({}_{4}\)-P release from different types of the blended biochar pellet. It appeared that the highest accumulated SiO\({}_{2}\) concentration was 2935.7 mg L\({}^{-1}\) in the TN, but while lowest in the PMCP was 1599.6 mg L\({}^{-1}\) in the final precipitation periods. The lowest in the PMCP was continuously observed, compared to the other treatments from 6.7 days through to the end of precipitation period (Figure 4). The estimation model for SiO\({}_{2}\) releases from different blended biochar pellets is presented in Table 7. The required times of 1/2 the maximum amount of accumulated SiO\({}_{2}\) were taken from 22.3 to 24.4 days, regardless of the blended biochar pellet uploaded with plant nutrient solutions, but were taken at 8.8 days in the PMCP.