한국환경농학회지 (Korean Journal of Environmental Agriculture)
- 제9권2호
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- Pages.83-95
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- 1990
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- 1225-3537(pISSN)
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- 2233-4173(eISSN)
농약(農藥)이 담수토양중(湛水土壤)중 미생물상(微生物相) 변화(變化)에 끼치는 영향(影響)
Effect of Pesticides on Change of Soil Microflora in Flooded Paddy Soil
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Han, Seong-Soo
(College of Agriculture, Wonkwang University) ;
- Kim, Seong-Jo (College of Agriculture, Wonkwang University) ;
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Baek, Seung-Hwa
(College of Agriculture, Wonkwang University) ;
- Choi, Hyo-Jung (Graduate of Eduation, Wonkwang University)
- 발행 : 1990.12.30
초록
농약(農藥)이 토양(土壤) 미생물(微生物)의 상변화(相變化)에 끼치는 영향(影響)을 구명(究明)하기 위하여 담수토양(湛水土壤) 상태하(狀態下) 수도(水稻)를 이앙(移秧)한 구(區)와 이앙(移秧)하지 않은 구(區)에 살충제(殺蟲劑)인 carbofuran, 제초제(除草劑) pyrazolate 및 pyrazolate+pretilachlor 합제(合劑)를 처리(處理)한 후(後) pH 변화(變化)와 총세균(總細菌), 그람 음성균(陰性菌), 사상균(絲狀菌)등의 수(數)를 경시적으로 조사분석(調査分析)한 결과(結果)는 다음과 같다. 1. pH 변화(變化)는 수도재배(水稻栽培) 약제(藥劑) 처리후(處理後) 시일(時日)이 경과(經過)함에 따라 약간(若干) 낮아지다 6주(週)째에는 다시 상승(上昇)하였고, 수도(水稻)를 재배(栽培)한지 않은 경우(境遇) 약제처리후(藥劑處理後)의 pH는 거의 변화(變化)가 없었다. 2. 공시약제(供試藥劑) 모두 수도재배(水稻栽培) 유무(有無)에 관계(關係)없이 약제처리(藥劑處理) 후(後)의 총세균수(總細菌數)는 대조구(對照區)에 비하여 적었고 처리약량(處理藥量)이 증가(增加)함에 따라 감소(減少)되었으나 시일(時日)이 경과(經過)함에 따라 증가(增加)되었다. 3. 농약처리후(農藥處理後) 6주(週)째까지 그람 음성균(陰性菌)의 수(數)는 대조구(對照區)보다 적었고 시일(時日)이 경과(經過)함에 따라 carbofuran처리구(處理區)의 그람 음성균(陰性菌)의 수(數)는 감소(減少)되었으나 pyrazolate 및 합제처리(合劑處理)의 그람 음성균(陰性菌) 수(數)는 증가(增加)되는 경향(傾向)이었다. 4. 약제처리구(藥劑處理區)의 혐기성(嫌氣性) 세균(細菌)의 수(數)도 대조구(對照區)보다도 적었으나 시일(時日)이 경과(經過)하면서 증가(增加)되었다. 5. 사상균(絲狀菌)의 수(數)는 carbofuran 처리(處理)의 경우(境遇) 대조구(對照區)와 비슷하였으나 pyrazolate와 그 합제처리구(合劑處理區)의 경우(境遇)는 처리농도(處理濃度)가 증가(增加)하면서 4-5주(週)째 까지는 더욱 감소(減少)되다가 6주(週)째 까지는 더욱 감소(減少)되다가 6주(週)째에는 증가(增加)한는 경향(傾向)이었다.
This study was conducted to estimate influences of pesticides such as carbofuran[2,3-dihydro-2,2-dimethylbenzofuran-7-yl methyl carbamate] as an insecticide, and pyrazolate [4-(2,4-dichlorobenzolyl)-1,3-dimethyl-5-pyrazolyl-1,3-dimethyl-5-pyrazolyl-p-toluensulfonate], pyrazolate+pretilachlor [2-chlor-2,6-diethyl-N-(n-propoxyethyl) acetanilied] as herbicides on change in numbers of soil microorganisms and pH in planted and unplanted flooded rice paddy soils. The results of weekly investigated change of pH and populations of total bacteria, gram negative bacteria, anaerobic bacteria and fungi after treatments of pesticides were as follows : The change of pH in rice-planted soil gradually decreased in a matter of weeks after treatment with pesticide and the pH increased again from the sixth week, but no change of pH could be observed in nonplanted soil. The total numer of bacteria in the treated plots were slightly less than in the control plot, and the numbers decreased with increasing application rates of pesticides. But the microbial population increased in a matter of days after treatment with pesticide. Number of the gram negative bacteria until the sixth week after treatment of pesticide were fewer than control. The number in the carbofuran-treated plot decreased after a weeks after treatment, but numbers in plots treated with pyrazolate and pyrazolate+pretilachlor increased. The number of anaerobic bacteria in the treated plots were few by comparison with the untreated control, but the number increased after a weeks after treatment with pesticides. The populations of fungi in the carbofuran-treated plot were similar by comparison with the untreated control. The populations in the plots treated with pyrazolate and pyrazolate+pretilachlor decreased in 4 to 5 weeks with increase of application rate, but afterwards increased.
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