Allelopathic Effect of Sorghum Extract and Residues on Selected Crops and Weeds

수수의 타감작용(他感作用)에 관(關)한 연구(硏究)

  • Kim, S.Y. (Agricultural Biotechnology Institute, RDA) ;
  • De Datta, S.K. (Crop and Soil Environmental Sciences, Virgina Polytechnic Institute and State University) ;
  • Robles, R.P. (College of Agriculture, University of the Philippines at Los Banos) ;
  • Kim, K.U. (College of Agriculture, Kyungpook National University) ;
  • Lee, S.C. (College of Agriculture, Kyungpook National University) ;
  • Shin, D.H. (College of Agriculture, Kyungpook National University)
  • Received : 1993.10.19
  • Published : 1994.03.30

Abstract

To better understand the allelopathic effect of sorghum(Sorghum vulgare L.), the inhibitory activities of water extracts of the stem, leaf and root, and of residues of the stem to major crops and weeds associated with them were evaluated. The allelopathic activity of sorghum plants was species specific, and depended on source and concentration. Germination, and shoot and root length of all test species were inhibited by the different concentrations of the stem extract. Among the crop species, radish showed the most inhibition, followed by wheat and rice. Maize was the least sensitive species. Of the weed species, Ipomoea triloba was most inhibited, followed by Echinochloa colona and Rottboellia cochinchinensis. The water extracts of leaves, stems, and roots significantly inhibited germination and seedling growth in E. colona and radish. The stem extract gave the greatest inhibitory effect on E. colona while all three extracts produced similar response in radish. In the greenhouse trial, sorghum stem residue placed on the soil surface as mulch significantly inhibited seedling growth in E. colona and radish, but not that in rice.

생물검정 결과 수수에 함유된 타감물질의 억제 효과는 공시 식물, 사용부위 및 사용 농도에 따라 다르게 나타났다. 공시 작물 및 잡초 모두가 줄기에서 추출한 물질에 의해 발아 및 생장이 억제되었는데 작물은 무우, 밀, 벼 순으로 억제효과가 있었으며 옥수수에서 억제효과가 가장 적었다. 잡초는 Ipomoea, triloba에서 가장 억제효과가 나타났으며 그 다음이 Echinochloa colona, Rottboellia cochinchinensis 순으로 나타났다. 수수의 부위별로 타감물질의 억제정도를 조사한 결과 E. colona에서는 줄기 부위에서 가장 크게 나타났는데 7.5%(w/v) 에서 E. colona의 생육이 완전히 억제되었으나 잎, 뿌리는 억제효과가 크지 않았다. 무우에서는 줄기, 잎, 뿌리 모두가 비슷하게 억제 작용을 나타냈으며 5%에서 무우의 생육이 완전히 억제되었다. 온실에서 수수 줄기를 이용해서 mulching 실험을 한 결과 줄기의 타감물질이 E. colona와 무우에 상당한 억제효과가 있다는 것이 확인이 되었다.

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