Proceedings of the Korean Society of Crop Science Conference (한국작물학회:학술대회논문집)
- 2017.06a
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- Pages.241-241
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- 2017
Effects of strong shading on growth and yield in sweet potato (Ipomoea batatas L. LAMK.)
- Shin, Jong Moo (Division of Applied Life Science (BK21 Plus), Institute of Agriculture & Life Science, Gyeongsang National University) ;
- Song, Seon Hwa (Dept. of Agronomy, Gyeongsang National University) ;
- Park, Chan Young (Division of Applied Life Science (BK21 Plus), Institute of Agriculture & Life Science, Gyeongsang National University) ;
- Lee, Hyeon Young (Division of Applied Life Science (BK21 Plus), Institute of Agriculture & Life Science, Gyeongsang National University) ;
- Shim, Sang In (Dept. of Agronomy, Gyeongsang National University)
- Published : 2017.06.04
Abstract
Sweet potatoes (Ipomoea batatas (L.) LAMK.,) have been cultivated in Central and South America for about 2000 years and are now grown mainly in Asia and South America. Sweet potatoes are annual in the temperate region, but are classified as perennial in the tropical region. In 2000, the cultivation area of sweet potatoes decreased to about 16,000 ha in 2000, but the cultivation area increased slightly in recent 20,000 ha in Korea. Sweet potatoes do not show higher maximum dry matter production of 120 ~ 150g per plant, and the leaf area index (LAI), which maximizes dry matter production, is known as 3.0 ~ 4.0. As the leaf area increase, the penetration of light into the canopy becomes poor, and sufficient photosynthesis cannot be achieved in the lower leaves, on the other hand the respiration increase, which results in poor dry matter production. This study was conducted to know the responses of sweet potatoes to intensive shading treatment of 80% shading. This experiment was conducted for about 42 days from September 6, 2016 to October 18, 2016 at Gyeongsang National University Experimental Farm, Jinju, Korea. The plant canopy was shaded with black nylon 80% shade cloth suspended 1.2 m above the ground. The photosynthetic rate, stomatal conductance, chlorophyll fluorescence, SPAD and NDVI were measured in 3 replicates every 7 days after shading initiation. After the fresh weight was measured, the samples were dried at