Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Effects of Rhodobacter sp. SA16 on Lettuce(Lactuca sativa L.) in Plastic Film House

시설 상추에 대한 Rhodobacter sp. SA16 처리 효과

  • Lee, Young-Han (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Jeong, Han-Taek (Shinangrowth Co.) ;
  • Yun, Han-Dae (Division of Applied Life Science, Gyeongsang National Univ. and Research Institute of Agriculture and Life Science)
  • 이영한 (경상남도농업기술원) ;
  • 정한택 ((주)신안그로) ;
  • 윤한대 (경상대학교 응용생명과학부 및 농업생명과학연구원)
  • Published : 2008.06.30
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Abstract

This experiment was conducted to determine the development of mixed organic fertilizer using photosynthetic bacteria and mass production of mixed microbial compound for the environment-friendly agriculture. Photosynthetic bacteria, Rhodobacter sp. SA16 was isolated from soil collected by plastic film house. The SA16 strain was identified based on 16S rDNA sequence analysis and it is closely related to Rhodobacter sp.(100% similarity). The mixed organic fertilizer using SA16 was made of $N-P_2O_5-K_2O=60-10-20\;g\;kg^{-1}$ with combined soybean cake, sesame cake, powdered blood, fish meal, powdered bones and red-yellow soil. The mixed organic fertilizer 0.45, 0.90 and 1.35 Mg $ha^{-1}$ application in Ihyeon series was treated based on soil testing for lettuce cultivation in plastic film house. These results showed that the yield was increased the 18 and 19%over control by the mixed organic fertilizer application 0.45 and 0.90 Mg $ha^{-1}$, respectively. In the physical properties of the soil, the porosity of mixed organic fertilizer 1.35 Mg $ha^{-1}$ treatment was highest at 58.8%. Our results clearly revealed that the organic fertilizer using Rhodobacter sp. SA16 and mass production of mixed strains could be a useful technology in pursuing environment-friendly agriculture.

유기물이 많고 작물생육이 양호한 시설 및 논토양에서 우점하는 광합성 세균을 분리하여 대두박 등의 유기물질과 혼합하여 혼합유기질 비료를 개발하였고 상추에 대한 시용효과를 검토하였다. 광합성 세균은 시설 및 논토양에서 형태적으로 가장 분포도가 많은 균주를 선정하고 이를 SA16 균주로 명명하였다. 선발된 균주는 폭 $0.5{\sim}1.2{\mu}m$, 길이 $2{\sim}2.5{\mu}m$의 간균 혹은 구균에 가까운 형태로 관찰되었으며 16S rDNA 분석으로 1.3 kb DNA 단편을 얻어 염기서열을 분석한 결과 Rhodobacter sp.와 가장 유사한 것으로 나타났다. 질소기준으로 토양 검정시비 처리구와 동량인 혼합유기질비료 0.90 Mg $ha^{-1}$ 처리구는 대조구 보다 주당 엽수는 2장 정도 많았고 뿌리길이도 2 cm 정도 길었다. 혼합유기질 비료 시용량별 수확량은 $0.90{\geqq}0.45>1.35Mg\;ha^{-1}$ 순으로 많았으며 5% 수준에서 처리간에 유의성이 인정되었고 최대 수확량을 얻을 수 있는 적정 시용량을 2차 회귀곡선($y=-0.0008x^2+0.1174x+21.332,\;R^2=0.9951$)으로 구한 결과 0.72 Mg $ha^{-1}$로 나타났다. 수확 후 토양 공극율은 혼합유기질 비료1.35 Mg $ha^{-1}$ 처리구가 58.8%로 가장 좋은 것으로 나타났으며 혼합유기질 비료 처리에 따른 토양중 호기성세균의 분포는 혼합유기질 비료 0.90 및 1.35 Mg $ha^{-1}$ 처리구가 12.4, 및 $12.8{\times}10^6CFU\;g^{-1}$로 가장 높았다.

Keywords

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