자연광과 자연광에 인공광을 이용한 보광처리시 형광등, 백열등, 고압나트륨등으로 인공광의 종류를 달리하였을 때 백경채, 탑채, 상추, 쑥갓 및 잎들깨의 생육에 미치는 영향에 대한 실험결과를 요약하면 다음과 같다. 1. 전반적으로 대조구보다 보광처리구의 생육이 양호하였다. 2. 고압나트륨등처리구에서는 생육이 양호하여 엽중량비가 낮고, 엽면적이 넓으며 엽중이 무거워 외관상 상품가치가 높았으며 백열등처리구에서는 생체중은 무거웠으나 도장하여 상품성이 저하되었다. 형광등처리구에서는 고압나트륨등에 비하여 생육이 크게 떨어지지 않았다. 3. 엽록소의 상대적 함량은 전반적으로 큰 차이는 없었으나 고압나트륨등의 처리구에서 다소 높았다. 4. Vitamin C의 함량은 처리간 큰 차이는 없었으며 광 종류에 따라 작물마다 다른 반응을 나타내었다.

Background: The photosynthetic efficiency cool-season, semi-shade ginseng is normal at low morning temperatures, but drops at high afternoon temperatures. Therefore, optimal plant performance would be ensured if it were possible to control daily light transmission rates (LTR). Methods and Results: Plants were grown in a controlled light environment that replicated 11 AM conditions and comparatively analyzed against plant grown under normal conditions. Growth in the controlled light environment resulted in a 2.81 fold increase in photosynthetic efficiency with no change in chlorophyll content, although LTR were high due to low morning temperatures. Increased aerial plant growth was observed in the ginseng plants adapted to the controlled light environment, which in turn influenced root weight. An 81% increase in fresh root weight (33.3 g per plant on average) was observed in 4-year-old ginseng plants grown in controlled light environment compared to the plants grown following conventional practices (18.4 g per plant on average). With regard to the inorganic composition of leaves of 4-year-old ginseng plants grown in controlled light environment, an increased in Fe content was observed, while Mn and Zn content decreased, and total ginsenoside content of roots increased 2.37 fold. Conclusions: Growth of ginseng under a favorable light environment, such as the condition which exist naturally at 11 AM and are suitable for the plant's photosynthetic activity creates the possibility of large scale production, excellent-quality ginseng.

Background : The ginseng cool-season and semi-shade plant undergoes photosynthesis smoothly at low temperature in the morning but its efficiency falls at high temperature in the afternoon. Therefore, if it is possible to control light transmission rates (LTR) every day, it will be able to draw an ideal result in the ginseng growth by attracting a lot of lights before 11am and attracting few lights after 11am which is the affect point of the photosynthetic efficiency. Methods and Results : While installing the sun shading facility that could control the light environment based on 11am and surveying the ginseng's growth and photosynthetic characteristics. The photosynthetic efficiency increased 2.81 times compared to conventional practices without the change of the chlorophyll content although LTR was high because of the low temperature in the morning. The aboveground part growth of the ginseng which adapted to the light environment increased to influence the root weight, when the ginseng was 4 years old, the fresh root weight was averagely 33.3g per plant which increased by 81% than 18.4g of conventional practices. Conclusion : If the light environment management according with the photosynthetic nature of the ginseng is conducted based on 11am, it will be possible to produce a large capacity and excellent-quality ginseng.