Background: This study was aimed at evaluating the growth, yield, and carbohydrate content in the whole Allium hookeri plant with shading treatment in hot summer. Methods and Results: Different shading rate, including 0 (control), 35 or 55%, was employed from the June 21st to August 31st. Daily average air and soil temperature, which were approximately 2.5℃ and 3.8℃ lower, respectively, were observed with both 35% and 55% treatments in July and August, with no significant difference in daily maximum air temperature. Dry weights were high, approximately 40% and 48% for the shoot and 20% and 12% for the root, with the 35% and 55% treatments, respectively, 8 weeks after shading. Division number was increased by 13% and 19.8% with the 35% and 55% treatments, respectively. The mortality rates of 150 plants were 9.1%, 4.0%, and 1.3% with the 0 (control), 35% and 55% treatments, respectively. At 4 weeks after shading, the highest and lowest sucrose levels in both shoot and root were observed with the 35% and 55% treatments, respectively. At 8 weeks after shading, there was no significant difference in the sucrose content in the shoot among the treatments. Conclusions: The highest plant growth rate and yield with the 55% treatment may be related with the decrease in both air and soil temperatures, resulting in reducted leaf respiration and thus compensate net photosynthesis.

ABSTRACT
 서 언
 재료 및 방법
  1.실험재료
  2. 차광처리
  3. 광합성율 조사
  4.생육특성 조사
  5. 유리당 조사
  6.통계분석
 결과 및 고찰
  1. 차광 처리별 온도감소 효과
  2.차광처리에 따른 광합성 특성의 변화
  3. 차광처리에 따른 식물생육 특성 비교
  4. 차광처리에 따른 지상부, 지하부의 당 함량 변화
 REFERENCES

• 김명희(충남농업기술원 원예연구과, Department of Horticulture, Chungnam Agricultural Research Center) | Myung Hee Kim
• 송병민(한국방송통신대학교 농학과, Department of Agricultural Science, Korea National Open University) | Beong Min Song
• 최은영(한국방송통신대학교 농학과, Department of Agricultural Science, Korea National Open University) | Eun Young Choi Corresponding author