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In order to determine the physiological properties of Bletilla striata, especially on the effects of water content on its growth, physico-chemical properties of the soil at endemic region were analyzed. The growth of B. striata was, also, investigated at various soil texture and water content with artificially prepared soils. The sand (S), sandy loam (SL), sandy clay loam (SCL), and silty clay loam (SiCL) soils were prepared from sand and clay soils. The soil water contents were controled at three levels such as 10-40%, 40-70%, and 70-100% of field moisture content of each soils. Soil texture of the endemic region appeared as SL, SCL, and L respectively. The soil had relatively lower values in canon exchange capacity, available phosphorus, and total nitrogen content than those of upland soils. The soil reaction, electric conductivity and sodium absorption ratio (SAR) were estimated as 5.47-5.67, 0.087-0.104 dS·m^(-1), and 0.024-0.028%, respectively. The highest relative growth rate was obtained above the -1.11 ㎫ of water potential. It suggested that the growth of B. striata will be good above 3.10, 5.83, 11.24 and 17.23% of water content of S, SL, SCL, and SiCL, respectively.
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