原報
高知県に分布する種々の土壌を用いたホソバオケラの栽培試験
2018 年 72 巻 2 号 p. 81-86
詳細
2018 年 72 巻 2 号 p. 81-86
In Japan, dried rhizome of Atractylodes lancea is used as a crude drug called So-jutsu (Atractylodes lancea rhizome). The demand for So-jutsu in Japan has risen to 800 tons per year; however, currently it is all imported from China. In an effort to establish a sustainable cultivation method for A. lancea in Kochi Prefecture, we focused on the effects of soil type on plant growth rate, essential oil content, and β-eudesmol and atractylodin concentrations in the rhizomes. Five different soil types including Gray Lowland soil, Brown Forest soil, Andosol, Sand dune Regosol and Red soil, were selected based on their proportion and distribution around Kochi Prefecture. Survival rate of the plants during the two-year cultivation period was 100% in Red soil but only 70% in Gray Lowland soil. Growth rate of the rhizomes was highest in Red soil (6.6-fold increase in fresh weight after two years) and lowest in Gray Lowland soil (2.7-fold increase). The essential oil content and concentrations of β-eudesmol and atractylodin were mostly unaffected by soil type. These results indicate that upland fields composed of Red soil are best suited, while paddy rice fields composed of Gray Lowland soil are not suitable for the cultivation of A. lancea in Kochi Prefecture.
