시판 유기질 퇴비(우분, 돈분, 계분 및 혼합분) 16종의 총 호기성 세균수, 대장균 및 대장균군 그리고 Salmonella에 대한 미생물 오염도를 파악하고, 미생물 오염도 저감화 및 위생성 향상을 위해 감마선을 조사한 후 미생물 사멸도를 측정하였다. 총 호기성 세균수는 우분, 돈분, 계분 및 혼합분의 경우 으로 유의적인 차이를 나타내지 않았다. 대장균군은 16종의 시료 중 12종의 시료에서 의 분포를 나타내었고, 대장균은 3종의 시료에서 의

Organic compost is a useful fertilizer for organic farming. However, it poses a microbiological hazard to the farm produce because most of the compose are originated from excrementitious matters of domestic animals. Irradiation was performed to improve microbiological safety of organic compost and the effectiveness of gamma-irradiation for inactivating Salmonella typhimurium and E. coli was investigated. Total aerobic bacteria and coliform bacteria in 16 produce or commercial compose were ranged from , respectively. All coliform bacteria in the composts were eliminated by irradiation at 5 kGy, while about of total aerobic bacteria survived up to 10 kGy of irradiation. In the inoculation test the test organisms (inoculated at ) were eliminated by irradiation at 3 kGy. values of inoculated Salmonella typhimurium and E. coli in the compost were . It was considered that of gamma irradiation was effective for radicidation (radiation sterilization of pathogenic microbes) of organic fertilizer.

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