Abstract
1999년부터 2001년까지 3년간 친환경농업 시범마을에 적용되고 있는 INM (Integrated Nutrient Management) and IPM (Integrated Pest Management) 실천에 따른 추진효과를 분석하기 위하여 시범마을로 지정된 옥천과 양평지역의 농가 포장에서 시비량, 양분유실 및 생태계 변화 등을 조사 분석하였다. 3요소 시비량은 토양검정시비로 인하여 농가관행시비와 비교하여 <TEX>$28.6{\sim}39.4%$</TEX> 절감할 수 있었으며, 쌀 수량도 시비량이 비교적 적은 토양검정 시비구에서 <TEX>$3{\sim}10%$</TEX> 증수하였다. 영농기간동안 토양 침투수중 <TEX>$NO_3-N$</TEX> 농도는 농가관행 시비구 2.9 mg/L에 비하여 토양검정 시비구는 1.5 mg/L로 감소하였으며, 시범마을 논으로 유입되는 관개수의 COD, <TEX>$NH_4-N$</TEX>, <TEX>$NO_3-N$</TEX> 농도는 각각 15.0, 0.67, 1.39 mg/L, 시범마을 논에서 배출된 용수는 각각 12.4, 0.29, 2.42 mg/L로 감소되는 경향이었다. 처리별 수서곤충, 환형동물, 패류 및 감각류 등의 개체수는 농가관행구 100에 대하여 토양검정 시비구 295, 토양검정과 개량제 혼용구 276, 무비구 90으로 토양검정 시비구에서 많았으며 수서 무척추 동물은 관행농업을 수행하고 있는 지역을 100으로 볼 때 친환경농업마을은 242와 443으로 INM과 IPM을 실천하는 시범마을에서 생물종이 다양하고 그 개체수가 많은 것으로 나타났다. 친환경농업 시범마을 조성 후 작물 추천시비량 준수와 적기 예찰을 통하여 필요이상 사용되는 비료와 농약을 절감하여 생태계의 개선과 토양이 건전화된 것으로 평가되었다. In order to preserve the soundness of agro-ecosystem and products safety in agriculture, this study was evaluated environmental impact in relation to the INM (Integrated Nutrient Management) and IPM (Integrated Pest Management) at paddy fields at Ok-Chun and Yang-Pyung region. By introduction of INM with the application of BB(bulk-blanded) fertilizer based on soil analysis and IPM, the application rate of fertilizer was reduced to about <TEX>$28.6{\sim}39.4%$</TEX> and the yield of brown rice was increased to about <TEX>$3{\sim}10%$</TEX> compared to conventional practices. The concentrations of COD, <TEX>$NH_4-N$</TEX>, and <TEX>$NO_3-N$</TEX> in irrigation water flowed to the environmental-friendly agriculture practices were 15.0, 0.67, and 1.39 mg/L, respectively. The concentrations of COD, <TEX>$NH_4-N$</TEX>, and <TEX>$NO_3-N$</TEX> from paddy fields in drainage water were 12.4, 0.29, and 2.42 mg/L, respectively. The total number of the freshwater invertebrates was higher in field treated with fertilization by prescription with soil testing. Also, the population density of aquatic insects was higher than the other fields at both demonstration villages. In conclusion, it was possible to reduce the amount of fertilizer and agricultural chemicals application, and increase the yield of rice by application of the environmental-friendly agriculture practices.
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