논발생(發生) 담수조류(湛水藻類)에 관(關)한 연구(硏究) - VI. 부유성(浮游性) 녹조류(綠藻類)와 괴불의 발생(發生) 및 방제(防除)

Fresh-water Algae Occurred in Paddy Rice Fields - VI. Ecology of Suspensible Green Algae and Soil-flakes and Their Chemical Control

  • Lee, H.K. (Agricultural Chemicals Research Institute, RDA) ;
  • Park, J.E. (Agricultural Chemicals Research Institute, RDA) ;
  • Ryu, G.H. (Agricultural Chemicals Research Institute, RDA) ;
  • Lee, J.O. (Agricultural Chemicals Research Institute, RDA) ;
  • Park, Y.S. (Agricultural Chemicals Research Institute, RDA)
  • 투고 : 1993.06.20
  • 발행 : 1993.06.30

초록

벼 이앙(移秧) 직후(直後) 대량(大量) 발생(發生)하여 벼에 피해를 주는 부유성(浮遊生) 녹조류(綠藻類)와 괴불의 생태(生態) 및 방제(防除)에 관한 몇 가지 시험(試驗)을 수행(遂行)하여 다음과 같은 결과(結果)를 얻었다. 1. 단세포성(單細胞性) 부유성(浮遊生) 녹조류(綠藻類) Chlamydomonas의 발생(發生)은 인산(燐酸) 시용(施用)으로 증가(增加)되었으나 질소(窒素) 시용(施用)으로 저해(沮害)되었다. 2. 사장형(絲狀形) 부유성(浮遊生) 녹조류(綠藻類) Klebsormidium의 발생(發生)은 인산(燐酸) 시용(施用)으로 增加되었고 인산(燐酸)에 질소(窒素) 또는 가리(加里)를 조합(組合) 시용(施用)한 경우(境遇)에는 더욱 증가(增加)되었다. 3. 벼 이앙(移秧) 직후(直後) 수면(水面)에 대량(大量) 발생(發生)하는 부유성(浮遊生) 녹조류(綠藻類) Klebsormidium은 simazine 10g ai/10a, propanil 105g ai/10a 처리(處理)로서 60-70%방제(防除)가 가능(可能)하였다. 4. 남색(藍色)괴불은 질소(窒素) 시용(施用)으로 증가(增加)되었으나 질소(窒素)와 인산(燐酸)의 조합(組合) 시용(施用)으로 더욱 증가(增加)되었다. 5. 갈색(褐色)괴불은 인산(燐酸) 시용(施用)으로 증가(增加)되었으나 인산(燐酸)에 질소(窒素) 또는 가리(加里)가 조합(組合) 시용(施用)되어도 증가(增加)되지 않았다. 6. 남색(藍色)괴불을 일으키는 남조류(藍藻類) 흔들말(Oscillatoria)은 $24^{\circ}C$$29^{\circ}C$의 온도조건(溫度條件)에서보다 $18^{\circ}C$조건(條件)에서 더 많이 발생(發生)하였다. 7. Bensulfuron/ mefenacet/dymron(마무리 입제(粒劑)), piperophos/dimethametrin(아비로산 입제(粒劑)), bensulfuron/dimepiperate(두배논 입제(粒劑)) 처리(處理)는 남색(藍色)괴불에 대하여 높은 방제효과(防除效果)를 보였으며 이앙후(移秧後) 10일(日) bentazon(벤타존 액제(液劑)) 담수처리(湛水處理)는 50% 정도(程度)의 방제효과(防除效果)를 보였다.

The experiments on the ecological characteristics of the suspensible green algae and the algae causing soil-flakes and shier chemical control were conducted in 1992. The unicellular green algae which were dominated by Chlamydomonas sp. largely occurred when phosphorus was applied, but which were reduced by nitrogen application. The filamentous green algae which were dominated by Klebsormidium sp. largely occurred when phosphorus was applied, and which much more increased when nitrogen or potassium was combined with phosphorus. The suspensible green algae which were dominated by Klebsormidium sp. were controlled by 60-70% when simazine 10g ai/10a and propanil 105g ai/10a were applied. The dark blue soil-flakes largely occurred at nitrogen application, and which much more increased when nitrogen was combined with phosphorus. The dark brown soil-flakes largely occurred at phosphorus application, but no more increased even if nitrogen or potassium was combined with phosphorus. The dark blue soil-flakes which were dominated by Oscillatoria sp. much more increased at the temperature conditions of $18^{\circ}C$ compared with $24^{\circ}C$ and $29^{\circ}C$. The applications of bensulfuron/mefenacet/dymron, piperophos/dimethametryn and bensulfuron/dimepiperate controlled 70-90% of the dark blue soil-flakes.

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