Journal of the Korean Society of International Agriculture (한국국제농업개발학회지)

The Korean Society of International Agriculture (한국국제농업개발학회)
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Effects of Transplanting and Harvesting Dates on Characteristics of Yield and Quality of Storage Roots of Sweetpotato (Ipomoea batatas (L.) Lam)

고구마 품종별 삽식 및 수확 시기에 따른 괴근 수량과 품질 특성

  • 이형운 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 이준설 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 양정욱 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 한선경 (농촌진흥청 대변인실) ;
  • 남상식 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 김재명 (국립원예특작과학원 배연구소) ;
  • 안승현 (농촌진흥청 국립식량과학원) ;
  • 정미남 (농촌진흥청 국립식량과학원) ;
  • 송연상 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 황엄지 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 이경보 (농촌진흥청 국립식량과학원 바이오에너지작물연구소)
  • Received : 2015.07.01
  • Accepted : 2016.06.17
  • Published : 2016.06.30
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Abstract

The effect of transplanting and harvesting dates on growth, yield, and quality of sweetpotato varieties was studied. Three sweetpotato varieties, Yulmi, Singeonmi, and Dahomi, were transplanted on 23 Apr., 21 May, 5 June, 15 June, 25 June, 5 July, 15 July, and 25 July. Fresh vine weight and marketable storage root yield of the three varieties were the highest in transplanting plots on 23 April and 21 May, respectively, and those tended to decrease when transplanting dates were late after May. GDD (Growing Degree Days) and cumulative radiation seemed to be related to marketable storage root yield. Number of marketable storage root per plant, average weight of marketable storage root, and marketable storage root yield were significantly different according to transplanting dates. Marketable storage root yield showed significantly positive correlations with fresh vine weight, number of marketable storage roots, and average weight of marketable storage roots. Hardness and dry matter content of storage root showed significantly positive correlations with starch content and decreased with late transplanting dates in Yulmi and Singeonmi varieties. Pasting temperature showed significantly positive correlations with soluble solid content, dry matter content, and amylose content, but it showed significantly negative correlations with breakdown. Setback was significantly different among varieties, but it was not significantly different in transplanting dates.

고구마 품종별 삽식 및 수확시기에 따른 생육, 괴근 수량 및 괴근 특성을 조사한 결과는 다음과 같다. 1. 삽식시기별 재배기간의 GDD와 일사량은 삽식시기별 상저수량과 유사한 경향을 나타내었으나 일조시수는 상저수량과 뚜렷한 경향이 없었다. 2. 지상부 무게는 4월 23일 삽식시 가장 많았으며, 삽식시기가 늦을수록 감소하는 경향이었다. 삽식시기에 따라 주당상저수와 상저평균중, 상저수량에 유의한 차이가 있었으며 상저수량은 5월 21일 삽식시 많았다. 주경의 길이와 주경의 직경은 주당상저수, 상저수량과 각각 양과 음의 상관관계를 나타내었다. 분지수는 지상부 수량, 주당상저수, 상저수량과 양의 상관관계였으며, 지상부 무게는 상저평균중, 상저수량과 양의 상관관계를 나타내었다. 3. 생고구마 경도와 건물률은 전분함량과 양의 상관관계를 나타내었다. 호화개시온도는 삽식시기가 늦을수록 낮아지는 경향이었으며 당도, 건물률, 아밀로오스 함량과는 양의 상관, 강하점도와는 음의 상관관계를 나타내었다. 치반점도는 삽식 시기에 따른 유의한 차이는 없었으나 품종에 따른 유의한 차이가 인정되었다.

Keywords

Acknowledgement

Grant : 남부지역 고구마 삽식 한계기 및 작부체계 연구

Supported by : 농촌진흥청

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