Effect of Scape Cut during Bulb Development Stage on Carbohydrate Formation and Yield of Garlic (Allium sativum L.)
2008
Nam, S.S. (Mokpo Experiment Station, NICS, RDA, Muan, Republic of Korea) | Choi, I.H. (Mokpo Experiment Station, NICS, RDA, Muan, Republic of Korea), E-mail: [email protected] | Bae, S.K. (Mokpo Experiment Station, NICS, RDA, Muan, Republic of Korea) | Bang, J.K. (Mokpo Experiment Station, NICS, RDA, Muan, Republic of Korea)
This study was conducted to investigate the effect of scape cut during bulb development stage on leaf dryness, carbohydrate and yield of garlic (Allium sativum L.) in the field. The cloves were planted on polyethylene film-mulching plots at 18 × 11 cm on September 25, 2006 and harvested on May 30, 2007. Time of scape cut was on May 4, 2007. Percentage of leaf dryness of no scape cut was slowly increased from 24.3% on May 14 to 63.9% on May 30, while that of scape cut was rapidly increased from 27.1% to 75.5%, respectively. Leaf area of scape cut and no scape cut were 141.2 and 228.1 ㎠ per plant on May 30. Photosynthetic rate was similar to 11.0-10.9 μmol m-² s-¹ on May 14, but photosynthetic rate of no scape cut increased to 13.4 μmol m-² s-¹ on May 19 compared to 12.7 μmol m-² s-¹ for scape cut. The glucose and sucrose content in leaves and leaf sheath of non scape cut were gradually decreased and the fructose was increased during bulb development stage. The fructose content in leaves of scape cut was high as 137.3 mgㆍg-¹ compared to 80.6 mgㆍg-¹ of no scape cut on May 30. However, the fructose content in leaf sheath of scape cut was greatly decreased and then gradually increased. The sucrose content of scape include bulbil was decreased to 89.1 mgㆍg-¹ on May 30 compared to 145.0 mgㆍg-¹ on May 9 and the fructose was increased during bulb development stage. The sucrose content of bulb in no scape cut was gradually increased. On the other hand, the sucrose content of bulb in scape cut off was greatly increased from 499.2 mgㆍg-¹ on May 9 to 803.2 mgㆍg-¹ on May 30. The ratio of large bulb diameter (above 45 mm), bulb weight and yield of scape cut were 61.1%, 34.2 g, and 1,310 kg/10a, respectively. The yield of no scape cut was decreased to 8.6% compared to 1,197 kg/10a for scape cut.
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