The results illustrated that the treatment
with various rates of zinc, magnesium and sulphur gave difference in fresh stem weight, fresh rhizome weight,
fresh root weight (g/root) and root starch content, but the foliar fertilization with Zn+Mg+S gave the highest on its
while KU 50 cultivar gave the greater effect on fresh stem weight and fresh rhizome weight , HB 60 cultivar
tended to give higher fresh root yield ( 11.90 t rai-1 or 74.38 t ha-1 ) and fresh root weight (370.10 g/root) but HB
80 cultivar tended to give higher root starch content (27.16%) and root number (13.81 root/plant). The Zn+Mg
treatment sprayed on HB 60 cultivar gave the highest fresh root yield (15.77 t rai-1 or 98.56 t ha-1) and fresh root
weight (442.45 g/root) but the HB 80 cultivar with Zn+Mg+S foliar fertilization gave the highest root starch
content of cassava by 29.33%.