An Investigation of Characteristics of Chinese Bellflower (Platycodon grandiflorum A.) Cultivated Soil

Abstract

In order to understand the characteristics of soil according to the cultivation environment of Chinese bellflower(Platycodon grandiflorum A.), soil chemical properties of 12 collected soil samples from 6 cultivated fields in Okcheon,Chungbuk province in August. 2017 were analyzed. The soil pH was distributed within the range of 4.61 to 5.25 at allcultivation years and E.C (Electric Conductivity) and T-N (Total Nitrogen) of the cultivation year were not significant. Available P2O5 was higher than the average for medicinal crops and P. grandiflorum in Korea and C.E.C (Cation ExchangeCapacity) was inconsistent for each cultivation year. In particularly, it was validated that the content of exchangeablecations K, Ca, Ma, and Na in this experiment was similar to that of C.E.C according to the cultivation years, because C.E.Chad a high correlation with the exchangeable cations. For the available P2O5, as affected by trans-planting, 5Y-NT-H(cultivated 5 years and non-transplanted) had 58 mg/kg, while 5Y-T-H (cultivated 5 years and transplanted) had 246 ㎎/㎏. The soil pH was found to be lower (acidic) in diseased soils than healthy soils. E.C was confirmed to be was higher indiseased soils than healthy soils except for the one cultivated for 2 years. The contents of T-N and available P2O5 werehigher in diseased soil except for the one cultivated for 5 years and 11 years. The exchangeable cation K and Na tended tobe higher in diseased soils rather than that in healthy soils, and the exchangeable cation Ca and Mg contents were higher inhealthy soils than in diseased soils. The C.E.C of the soil was lower than that of healthy soils in all of the years except for theone which was cultivated for 5 years (transplanted).