We conducted this study to determine the recommended application rate of fertilizer for Thunb cultivation. The effects of various application levels of N, PO, and KO fertilizers on the growth of this plant were investigated and the associated changes in soil properties were evaluated in the field. Soil pH at harvest time of Thunb did not differ from that before fertilization, whereas EC tended to decrease during cultivation. The soil organic matter (SOM) and available phosphorus increased after treatment, and the amount of applied fertilizer (PO) and available phosphorus were proportional. The nitrogen absorption amount increased in N 100% treatment, but decreased in N 150% treatment. The phosphorus absorption amount rose with the fertilizer treatment concentration until PO 150% treatment. The amount of absorbed potassium decreased in treatments with KO 150% and KO 200%. The plant length was the longest in N 100%, PO 150%, and KO 200%. The stem diameter was estimated to be 3.46 - 3.67 mm in N 100 - 200% treatment, 3.55 - 3.67 mm in PO 100 - 150%, and 3.79 mm in KO 200%. The number of tillers did not differ amongst fertilization treatments. The fresh weight was summed to be 3.67 ton/10 a in N 100% treatment, 3.79 Mg/10 a in PO 150%, and 3.83 Mg/10 a in KO 150%. Thus, the relationship between the fertilizer amount and yields of the plant showed that the most economical quantity of fertilizers should be 10.2 N kg/10 a, 5.5 PO kg/10 a, and 8.2 KO kg/10 a for Thunb.