KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effects of Varieties, Growth Duration, and Topping for Occurrence of Skin Ridge on the Tuberous Root in Sweet Potato (Ipomoea batatas Lam.)

고구마 품종, 생육기간 및 경엽제거가 피맥발생에 미치는 영향

  • Choi, Kyu-Hwan (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Yu, Young-Jin (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Hyo-Jin (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kang, Chan-Ho (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Jeong, Jong-Sung (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Song, Young-Ju (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Chung-Kon (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Seung-Yeop (Wonkwang University, College of Agriculture)
  • Received : 2014.03.31
  • Accepted : 2014.05.28
  • Published : 2014.06.30
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Abstract

Skin ridge (SR) is a irregular line shape that stand out in epidermal layer on sweet potato (Ipomoea batatas Lam.). SR reduced marketable value of storage root in sweet potato. It would be occurred by accumulation of starch in epidermal layer. SR rate was more highly increased in early planting. SR rate was under 3% in 7 varieties 'Geonpoongmi', 'Yeonhwangmi', 'Geonmi' etc and the rate of two varieties 'Healthymi', 'Borami' were up to 30%. SR rate was positively correlated with vine weight. SR rate was the highest in 120 days after planting. As leaf area index was reduced to 3, 4, 5 and 6 (non-topping) by topping, it was hard to fine SR occurrence in topping treated sweet potato. Topping treatment, however, caused decrease in yield overall. Therefore, topping treatment for decreasing of SR was not recommended in agricultural practice of sweet potato.

고구마 괴근의 표피에 선모양으로 돌출되어 나타나는 피맥의 발생동향을 조사하고, 경감하기 위한 시험의 결과는 아래와 같다. 1. 고구마 피맥은 표피가 줄무늬로 돌출되어 상품성을 저하시키는 증상으로서 피맥발생은 표피층에 전분이 집적되어 발생하는 것으로 관찰되었고, 조기재배보다 보통기재배에서 발생이 많았다. 2. 고구마 품종에 따른 피맥발생은 건풍미, 연황미, 건미 등 7품종이 3%이하로 적었고, 헬씨미, 보라미는 30%이상 발생하였다. 만중은 피맥발생과 정의 상관관계가 있었다. 3. 고구마 피맥은 생육기간이 진전됨에 따라 증가하다가 삽식 후 120일경에 가장 높았다. 4. 고구마 삽식 후 90일의 적심비율에 따른 피맥발생율은 일정한 경향을 보이지는 않았다. 엽면적지수 4에서 피맥발생율이 가장 적었으나, 일정한 경향을 보이지는 않았고, 경엽절제비율이 높을수록 수량감소가 크게 나타났다.

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References

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