Smart farm is a high-tech type of plant factory that artificially makes environmental conditions suitable for the growth of plants and manages them to automatically produce the desired plants regardless of seasons or space. This study was conducted by identifying the effects of Hertz and Duty ratio on the photosynthetic rate of ginseng, a medicinal crop, to find the optimal conditions for photosynthetic responses in smart farms. The light sources consisted of a total of 10 chambers using LED system, with 4 R+B (red+blue) mixed lights and 6 R+B+W (red+blue+white) mixed lights. In addition, the Hertz of the R+B mixed light was treated at 20, 60, 180, 540, 1620 and 4860 hz respectively. The R+B+W mixed light was treated with 60, 180, 540, and 1620 hz. Afterwards, experiments were conducted with the duty ratio of 30, 50, and 70%. As a result, the photosynthetic rate of ginseng according to duty ratio and Hertz was the highest at 60 hz when duty ratio was set to 50%. On the other hand, that was the lowest when the duty ratio was 30% at the same 60 hz. In addition, the photosynthetic rates were highest in the R+B mixed light and R+B+W mixed light at 60 hz. Therefore, the condition with the highest photosynthetic rate of ginseng in smart farms is 60 hz when the duty ratio in R+B mixed light is 50%.

Abstract
서 론
재료 및 방 법
    1. 재배 및 관리
    2. 광원처리
    3. Hertz와 Duty 비
    4. 광합성률 측정
    5. 통계분석
결과 및 고 찰
    1. Duty 비 30% 내 광원과 Hertz에 따른 광합성률 비교
    2. Duty 비 50% 내 광원과 Hertz에 따른 광합성률 비교
    3. Duty 비 70% 내 광원과 Hertz에 따른 광합성률 비교
    4. 동일한 Hertz 내 Duty 비에 따른 광합성률 비교
    5. Hertz와 Duty 비에 따른 R+B 혼합광과 R+B+W혼합광에서의 인삼의 광합성률
REFERENCES

• 이정민(국립공주대학교 생명과학과)
• 박재훈(국립공주대학교 생명과학과)
• 이응필(국립생태원 외래생물연구팀)
• 김의주(국립공주대학교 생명과학과)
• 박지원(국립공주대학교 생명과학과)
• 유영한(국립공주대학교 생명과학과) Corresponding author