남부지역에서 저온기에 고구마 정식시기별 생육 및 수량성 평가

Low temperature significantly affects the growth and yield of sweetpotato (Ipomoea batatas L.); however, limited research has quantified its impact. This study evaluated the growth and yield of three sweetpotato varieties (‘Sodammi’, ‘Hopungmi’, and ‘Jinyulmi’) under different transplanting dates in a 2-year field trial (2023 and 2024) in Muan, Jeollanam-do. Transplanting dates ranged from April 1 to 20. Soil temperatures in 2024 were 1.6-2.5 ℃ higher than in 2023, promoting early growth. The number of adventitious roots 10 days after transplanting increased significantly for later transplanting dates (April 15) across all varieties. ‘Sodammi’ showed differences in storage root dry matter, whereas ‘Hopungmi’ and ‘Jinyulmi’ did not. Yield varied by year, with ‘Sodammi’ performing the best in 2023 with up to 1,877 kg/10a. ‘Hopungmi’ saw a significant increase in yield in 2024. ‘Jinyulmi’ produced consistent yields across both years, with the highest yield in 2024 (2,720 kg/10a) when transplanted on April 15. This study highlights the importance of optimizing transplanting dates for sweetpotato cultivation in low-temperature conditions.