This study evaluated the growth characteristics of Chinese cabbage (Brassica rapa subsp. pekinensis) cultivars under semi-highland summer cropping conditions to screen cultivars suitable for stable summer production. A total of fourteen cultivars, including domestic trial cultivars and cultivars introduced from subtropical or tropical regions, were cultivated in a semi-highland region of Korea during the summer growing season. Field experiments were conducted following standard cultivation practices, and plant growth was monitored through weekly non-destructive observations. Destructive sampling was performed at the heading stage (60 days after transplanting) to assess final growth performance and head characteristics. Growth traits, including shoot fresh weight, leaf number, leaf length and width, head height, head width, head weight, and marketable yield, were evaluated. In addition, the incidence of physiological disorders such as tipburn and major diseases, including soft rot and downy mildew, was recorded throughout the cultivation period. Cultivar-dependent differences were observed in growth performance, head formation stability, and tolerance to physiological disorders and diseases. Some cultivars introduced from subtropical or tropical regions exhibited rapid early growth; however, increased disease incidence and reduced head stability were observed during the late growth stage. In contrast, several domestic trial cultivars showed relatively stable head development and lower incidence of disease and physiological disorders under semi-highland summer conditions. These results indicate that cultivar selection emphasizing stable head formation and tolerance to biotic and abiotic stresses, rather than rapid early growth, plays a critical role in stabilizing summer Chinese cabbage production in semi-highland regions. Overall, this study provides fundamental information for selecting suitable lines and for establishing cultivation strategies for semi-highland summer Chinese cabbage production systems.

ABSTRACT
서 언
재료 및 방법
    1. 준고랭지 배추 비교 시험품종
    2. 시험포장의 기후조건 및 토양분석
    3. 묘소질 조사
    4. 주간 생육 모니터링 및 병증 조사
    5. 파괴조사
    6. 병증조사
결 과
    1. 묘소질 조사
    2. 주간 생육 모니터링
    3. 파괴조사
    4. 병해 발생 양상 분석
논 의
적 요
ACKNOWLEDGMENTS
REFERENCES

• 한강덕(세계채소센터 한국사무소) | Gangdeok Han (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 이세형(세계채소센터 한국사무소) | Sehyoung Lee (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 이주원(세계채소센터 한국사무소) | Joowon Lee (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 이은지(세계채소센터 한국사무소) | Eunji Lee (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 주유진(세계채소센터 한국사무소) | Yujin Joo (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 김지우(세계채소센터 한국사무소) | Jiwoo Kim (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea)
• 장성회(세계채소센터 한국사무소) | Seonghoe Jang (World Vegetable Center Korea Office, Wanju-gun, Jeollabuk-do 55365, Korea) Corresponding author
• 김진희(국립원예특작과학원 채소기초기반과) | Jinhee Kim (Vegetable Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Korea)
• 여경환(국립원예특작과학원 채소기초기반과) | Kyung-Hwan Yeo (Vegetable Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Korea) Corresponding author