Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Research of Chemical Properties of Soil and Growth Characteristics of Panax ginseng under Organic and Conventional Cultivation Systems in Korea

국내 유기와 관행 재배 인삼의 토양화학성과 생육 특성 조사

  • 임진수 (농촌진흥청 국립원예특작과학원 인삼특작부 약용작물과)
  • Received : 2016.04.05
  • Accepted : 2016.07.22
  • Published : 2016.08.31
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Abstract

The objective of the present study was to perform a comparative analysis of the chemical properties of the cultivation site soil and growth characteristics of organically and conventionally cultivated ginseng (Panax ginseng C. A. Meyer). Organically and conventionally cultivated ginseng samples (4-, 5-, and 6-year-old) were collected from 52 fields at 14 locations throughout Korea. The samples were collected over three years from 2013 to 2015, with the collection period between October and November of each year. In order to increase the yield of organically cultivated ginseng, the amount of nutrients was increased to match that of the conventional cultivation system, which highlights the need for proper management in accordance with the standards for chemical properties of soil. Growth duration of organic ginseng was ${\geq}60days$ shorter than that of conventional ginseng and its average yield per 1ha was 60% than that of conventional ginseng. Root weight of organically cultivated ginseng was approximately 54% that of conventionally cultivated ginseng. Rhizome diameter and body shape index of organically cultivated ginseng were lower than those of conventionally cultivated ginseng, indicating that organically cultivated ginseng was thinner and longer than conventionally cultivated ginseng. Root length was greater in 5-year-old conventionally cultivated ginseng with a low percentage of paddy-upland rotation fields. The number of rootlets was lower in 5- and 6-year-old organically cultivated ginseng with a high percentage of direct seeding cultivation. Dry weight was distinctly lower in 5- and 6-year-old organically cultivated ginseng with early defoliation than that of conventionally cultivated ginseng. Incidences of notched belly and root rot tended to be higher in conventional cultivation, with the incidence of notched belly being distinctly higher in 4- and 6-year-old roots and root rot being more prevalent in 5- and 6-year-old roots. Red discoloration and eelworm damage, which are highly affected by soil moisture, were most common in the organically cultivated 4-year-old roots. Organically cultivated ginseng showed early defoliation than conventionally cultivated ginseng, as a result, its yield and weight were low, while the incidence of physiological disorders was low. In order to increase the yield of organically cultivated ginseng, studies on cultivation technology that can overcome early defoliation, as well as soil moisture management that can minimize physiological disorders, are required.

본 연구는 유기재배와 관행재배지의 토양화학성 및 인삼의 생육특성을 비교 분석하기 위하여 수행하였다. 유기재배 인삼과 관행재배 인삼 시료 채취는 전국 14개 지역 52개 포장에서 4, 5, 6년근을 대상으로 2013년부터 2015년까지 3년에 걸쳐 10월부터 11월까지 2개월 동안 이루어졌다. 인삼 유기재배에서는 수량을 높이기 위해 관행재배지와 비슷하게 양분의 함량이 높아지고 있어 토양화학성기준에 맞는 적합한 관리가 요구된다. 유기재배 인삼은 관행재배 인삼보다 생육기간이 60일 이상 짧은 특징을 보였으며 1 ha당 평균 수량도 관행 수량의 60% 수준이었다. 근중은 유기재배 인삼이 관행재배 인삼의 54% 정도였다. 동직경 및 체형계수도 유기재배 인삼이 관행재배보다 더 작아 유기재배 인삼이 가늘고 긴 특징을 보였다. 근장은 답전윤환지의 비율이 낮은 관행재배 인삼 5년근에서 길었다. 지근의 수는 직파재배의 비율이 높은 유기재배 인삼 5, 6년근에서 적었다. 건물중은 관행재배보다 조기낙엽이 발생된 유기재배 인삼의 5, 6년근에서 뚜렷하게 낮았다. 동할과 뿌리썩음병은 관행재배에서 많은 경향이었는데 동할은 4, 6년근에서 뚜렷하게 많았으며 뿌리썩음병은 5, 6년근에서 많이 발생되었다. 토양수분의 영향을 많이 받는 적변과 선충의 피해는 유기재배 4년근에서 많았다. 즉 유기재배 인삼은 관행재배보다 조기낙엽 현상이 뚜렷하여 수량 및 근중이 낮은 반면 생리장해는 적었다. 유기재배 인삼의 수량을 높이기 위해서는 조기낙엽의 문제를 극복할 수 있는 재배 기술적인 연구가 필요하며 생리장해를 줄일 수 있는 토양 수분관리가 필요하다.

Keywords

References

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