## 2 Materials and Methods
### Nutrient Fertiliser Replacement Value
\begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{} & \multicolumn{6}{c}{**The Total Application Rate on Each Pot**} & \multicolumn{6}{c}{**Equivalent to Elements Applied to the Field**} \\ \hline \multirow{2}{*}{**Treatments**} & **CAN** & **KCLSolution** & **MgSO\({}_{4}\)** & **TSP** & **LFD** & **KC** & **N** & **K\({}_{2}\)O** & **P\({}_{2}\)O\({}_{s}\)** & **SO\({}_{3}\)** \\ \hline \hline KCl solution at 0\% of advised amount K & 7.1 & 0 & 0.3 & 0.8 & 0 & 0 & 310 & 0 & 60 & 23 \\ KCl solution at 20\% of advised amount K & 7.1 & 0.5 & 0.3 & 0.8 & 0 & 0 & 310 & 53 & 60 & 23 \\ KCl solution at 40\% of advised amount K & 7.1 & 1.1 & 0.3 & 0.8 & 0 & 0 & 310 & 106 & 60 & 23 \\ KCl solution at 70\% of advised amount K & 7.1 & 1.9 & 0.3 & 0.8 & 0 & 0 & 310 & 186 & 60 & 23 \\ KCl solution at 100\% of advised amount K & 7.1 & 2.7 & 0.3 & 0.8 & 0 & 0 & 310 & 265 & 60 & 23 \\ LFD at 40\% of advised amount K & 5.2 & 0 & 0.3 & 0.7 & 2.8 & 0 & 310 & 106 & 60 & 23 \\ K at 40\% of advised amount K & 6.9 & 0 & 0.1 & 0.5 & 0 & 3.8 & 310 & 106 & 60 & 23 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: The fertilisation scheme of the K-treatments and the equivalent amount of nutrients applied in the different treatments of the pot experiment. \begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{} & \multicolumn{6}{c}{**The Total Application Rate On each Pot**} & \multicolumn{6}{c}{**Equivalent to Elements Applied to the Field**} \\ \hline \multirow{2}{*}{**Treatments**} & **CAN** & **Kali60** & **MgSO\({}_{4}\)** & **TSP** & **LFD** & **AS** & **N** & **K\({}_{2}\)O** & **P\({}_{2}\)O\({}_{s}\)** & **SO\({}_{3}\)** \\ \cline{2-10}  & **g pot\({}^{-1}\)** & **g pot\({}^{-1}\)** & **g pot\({}^{-1}\)** & **g pot\({}^{-1}\)** & **g pot\({}^{-1}\)** & **g pot\({}^{-1}\)** & **kg ba\({}^{-1}\)** & **kg ba\({}^{-1}\)** & **kg ba\({}^{-1}\)** & **kg ba\({}^{-1}\)** \\ \hline CAN—0\% of the advised amount N & 0 & 0.7 & 0.3 & 0 & 0 & 0 & 0 & 70 & 0 & 23 \\ \(\text{CAN--20\%}\) of the advised amount N & 1.4 & 0.7 & 0.3 & 0 & 0 & 0 & 62 & 70 & 0 & 23 \\ \(\text{CAN--40\%}\) of the & 2.8 & 0.7 & 0.3 & 0 & 0 & 0 & 124 & 70 & 0 & 23 \\ \(\text{CAN--70\%}\) of the & 4.9 & 0.7 & 0.3 & 0 & 0 & 0 & 217 & 70 & 0 & 23 \\ \(\text{CAN--100\%}\) of the & 7.1 & 0.7 & 0.3 & 0 & 0 & 0 & 310 & 70 & 0 & 23 \\ \(\text{LED--40\%}\) of the & 0 & 0 & 0.2 & 0 & 5.1 & 0 & 124 & 190 & 19 & 23 \\ \(\text{A--40\%}\) of the & 0.7 & 0.04 & 0 & 0 & 3.4 & 124 & 70 & 0 & 23 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: The fertilisation scheme of the N-treatments and the equivalent amount of nutrients applied in the different treatments of the pot experiment. by weighing the fresh soil and then weighing it again after saturation was reached. The potato field soil was at 75% of the maximum WHC and therefore this soil was kept at 75% of the maximum WHC throughout the experiment. The K-poor soil was at 34% of the maximum WHC and therefore this soil was kept at a standard 60% of the maximum WHC. Before the pot filling, the soils were sieved through a 10 mm screen to remove the roots and debris. All pots were filled with 10 kg fresh soil and the first fertilisation dose was applied: approximately 50% of the total N amounts mentioned in Table 4 and 100% of the amount of Kali60 and Mg\({}_{\text{S}}\)O\({}_{4}\) for the N-treatments and 50% of the amounts of K and 100% of the other fertilisers for the K-treatments. The first fertilisation dose of the BBFs was 4.8 g AS pot\({}^{-1}\) and 69.4 g LFD pot\({}^{-1}\) (equal to 59 kg N ha\({}^{-1}\) and 52 kg N ha\({}^{-1}\)) for the N-treatments, and 45.3 g LF pot\({}^{-1}\) and 5.4 g KC pot\({}^{-1}\) (equal to 51 kg K\({}_{2}\)O ha\({}^{-1}\) and 19 kg K\({}_{2}\)O ha\({}^{-1}\)) for the K-treatments. The soil, fertilisers, and additional water (required for the K-treatments only) were mixed thoroughly before the pot was filled. Each treatment had four replicates, which resulted in a total of 56 pots. On 11 May 2020, potato tubers were planted in the pots.