KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effect of Subsoiling on Growth and Yield of Sweetpotato in Continuous Sweetpotato Cropping Field

고구마 연작지에서 심토파쇄에 따른 고구마 생육 및 수량성 변화

  • Lee, Hyeong-Un (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Chung, Mi-Nam (National Institute of Crop Science, RDA) ;
  • Han, Seon-Kyeong (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Ahn, Seung-Hyun (National Institute of Crop Science, RDA) ;
  • Lee, Joon-Seol (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Yang, Jung-Wook (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Song, Yeon-Sang (Rural Development Administration) ;
  • Kim, Jae-Myung (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Nam, Sang-Sik (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Choi, In-Hu (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration)
  • 이형운 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 정미남 (농촌진흥청 국립식량과학원) ;
  • 한선경 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 안승현 (농촌진흥청 국립식량과학원) ;
  • 이준설 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 양정욱 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 송연상 (농촌진흥청) ;
  • 김재명 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 남상식 (농촌진흥청 국립식량과학원 바이오에너지작물연구소) ;
  • 최인후 (농촌진흥청 국립식량과학원 바이오에너지작물연구소)
  • Received : 2014.07.30
  • Accepted : 2015.01.05
  • Published : 2015.03.31
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Abstract

Storage root yield of sweetpotato was decreasing owing to continuous sweetpotato cropping, debasement of soil physical properties, increasing incidence of pest and disease. This study was conducted to evaluate the changes in physicochemical properties of the soil owing to subsoiling (subsoiling to 50 cm depth), and the effect on growth and yield of sweetpotato. The subsoiling treatments included subsoiling treated every year for two years, subsoiling in the first year, and no subsoiling control. The soil physical properties measured were bulk density, hardness, porosity, three phase. Bulk density, porosity, soild (%) of three phase were improved by subsoiling in topsoil and subsoil. Main vine length and vine yield in subsoiling soil were higher than those in no subsoiling soil, but those were not significantly different. Yield of marketable storage root in subsoiling soils treated every year for two years and treated in the first year was more increased 17% and 20% than no subsoiling soil, respectively. The number of marketable storage root per plant was also higher in subsoiling soils than no subsoiling soil, but it was not significantly different. Soluble solid contents and total free sugar contents of storage root of sweetpotato were not significantly different among the treatments. These results show that improving soil physical properties by subsoiling could promote high yield of marketable storage root in continuous sweetpotato cropping field.

고구마 연작 토양에서 토양물리성을 개선하고 고구마의 괴근 수량을 증가시키기 위한 심토파쇄의 효과를 살펴본 결과는 다음과 같다. 1. 용적밀도와 공극률, 고상의 비율은 표토와 심토에서 2년간 심토파쇄+로터리 혹은 1년차 심토파쇄+로터리 토양에서 개선되어 심토파쇄에 의해 토양물리성이 개선되는 것으로 나타났다. 2. 심토파쇄의 깊이가 깊어질수록 유기물, 유효인산, 총 질소 등 토양 양분은 감소하는 경향이었다. 3. 지상부 수량과 주경의 길이는 2년간 심토파쇄+로터리 토양에서 많거나 길었으며, 1년차 심토파쇄+로터리 토양, 관행 로터리 토양 순으로 줄어들었으나 유의적인 차이는 없었다. 4. 심토파쇄+로터리 토양에서 관행 로터리 토양보다 상품괴근수량이 17~20% 정도 유의하게 많았으며 주당 상저수, 주당 상저중도 증가하여 고구마 연작지에서 심토파쇄에 의한 증수 효과가 있는 것으로 나타났다. 5. 고구마 괴근의 브릭스 당도와 총유리당 함량은 심토파쇄에 따른 유의한 차이는 없었다.

Keywords

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