This study was conducted to determine the optimal irrigation starting point by analyzing tree growth, physiological responses, fruit quality, and productivity in peach orchards. Seven-year-old ‘Kawanakajima Hakuto’ peach trees were used in an experimental field (35°49′30.4″N, 127°01′33.2″E) located within the National Institute of Horticultural and Herbal Science located in Wanju-gun, Jeollabuk-do. The irrigation starting point was set with four levels of –20, –40, –60, and –80 kPa from June to September 2022. While there were no significant differences in increase of trunk cross-section area and leaf area among treatments, shoot length and diameter decreased in the –80 kPa and –20 kPa treatments. The photosynthetic rate measured in August was highest for –60 kPa (17.7 μmol·m-2·s-1), followed by –40 kPa (15.6 μmol·m-2·s-1), –20 kPa (14.5 μmol·m-2·s-1) and –80 kPa (14.0 μmol·m-2·s-1). SPAD value measured in May and August was lower in the –80 kPa and –20 kPa treatments than in the –60 kPa and –40 kPa treatments. The harvest date reached three days earlier in the –20 kPa treatment compared to other treatments. The fruit weight was highest in the –60 kPa (379.1 g), followed by –40 kPa (344.0 g), –80 kPa (321.0 g) and –20 kPa (274.9 g). Firmness was the lowest in the –20 kPa treatment. The soluble solid content was highest in the –60 kPa treatment (13.3°Bx).The ratio of marketable fruits was highest in the –60 kPa treatment (50.7%) and lowest in the –80 kPa treatment (23.4%). In conclusion, we suggest that setting the irrigation starting point at –60 kPa could improve the fruit quality and yield in peach orchards.

서 론
재료 및 방법
    1. 시험 재료 및 처리
    2. 토성 물리성 분석
    3. 수체 생육 및 생리 반응 조사
    4. 과실 품질 및 수확량 조사
    5. 수분 이용 효율
    6. 통계 분석
결과 및 고찰
    1. 기상 및 토양 환경
    2. 수체 생육
    3. 수체 생리 반응
    4. 과실 품질 및 수확량
    5. 수분 이용 효율
적 요
사 사

• 이슬기(국립원예특작과학원 과수과 농업연구사) | Seul Ki Lee (Agricultual Researcher, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea) Corresponding author
• 조정건(국립원예특작과학원 과수과 농업연구사) | Jung Gun Cho (Agricultual Researcher, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea)
• 정재훈(국립원예특작과학원 과수과 농업연구사) | Jae Hoon Jeong (Agricultual Researcher, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea)
• 이동용(국립원예특작과학원 과수과 농업연구사) | Dongyong Lee (Agricultual Researcher, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea)
• 한점화(국립원예특작과학원 과수과 농업연구관) | Jeom Hwa Han (Senior Researcher, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea)
• 장시형(국립원예특작과학원 과수과 전문연구원) | Si Hyeong Jang (Research Associate, Fruit Research Division, National Institute of Horticultural & Herbal Science, Wanju 55365, Korea)
• 류수현(농촌진흥청 디지털농업추진단 농업연구사) | Suhyun Ryu (Agricultual Researcher, Department of Digital Agriculture, Rural Development Administration, Jeonju 54875, Korea)
• 김희태(국립농업과학원 안전재해예방공학과 농업연구사) | Heetae Kim (Agricultual Researcher, Safety Disaster Prevention Engineering Division, National Institute of Agricultural Sciences, Jeonju 54875, Korea)
• 강상현(국립농업과학원 안전재해예방공학과 전문연구원) | Sang-Hyeon Kang (Research Associate, Safety Disaster Prevention Engineering Division, National Institute of Agricultural Sciences, Jeonju 54875, Korea)