Percent starch content
Significant differences in starch content were observed between the various genotypes and fertilizer rates over the control (F0: 0-0-0 kg/ha) with Sisipe 290 showing the highest and Debor the lowest (Table 2). The highest starch content observed among the genotypes was in Sisipe 290 and this occurred at the F1 fertilizer treatment. Furthermore, the optimum fertilizer rate for higher starch production for Debor, Afisafi, Afebankye and Sispe 290 was 60N – 30 P2O5 – 90 K2O kg/ha (F1) fertilization. On the other hand, 120N – 60 P2O5 – 180 K2O kg/ha (F2) was the optimum rate of fertilizer application for higher percent starch content for Tuaka and Afebankye (Figure. 4). In conclusion, the study revealed that the economic rate of fertilization for higher fresh root yield for all the genotypes except Debor (120N – 60 P2O5 – 180 K2O kg/ha (F2) was F1 (60N – 30 P2O5 – 90 K2O kg/ha). For higher percent starch yield, 60N – 30 P2O5 – 90 K2O kg/ha (F1) is recommended for Debor, Afisafi and Sisipe 290, while 120N – 60 P2O5 – 180 K2O kg/ha (F2) is recommended for Tuaka and Afebankye.