최근 바이오디젤원료와 사료작물의 확보를 위하여 벼의 후작으로 유채를 재배하는 면적이 증가하고 있다. 그러나 유채는 습해에 취약하기 때문에, 수분유지 기능적 특성을 가진 논에서 재배할 경우, 명거 및 암거의 설치 등 배수개량이 필요하다. 본 연구에서는 유채재배 논에서 일반적으로 적용하고 있는 명거의 간격에 대해 검토하고 수평암거의 도입가능성에 대한 조사를 실시하였다. 조사결과 다음과 같은 사실을 알 수 있었다. 첫째, 명거의 경우 설치간격보다는 배치 및 기울기가 배수성 향상에 큰 영향을 미치는 것으로 나타났다. 둘째, 수평암거 설치 후가 설치 전에 비해 토양 잔류염분 농도가 현저히 저하된 것으로 나타났으며, 설치간격이 좁을수록 염분제거 및 과잉수분 배제효율이 높은 것으로 나타났다. 셋째, 생육 및 수량조사 결과, 배수성이 양호한 곳에서 생육 및 증수효과가 양호한 것으로 나타났다.

In recent years biodiesel has received much attention as a means of reducing fossil fuel consumption and greenhouse gas emissions. Particularly, biodiesel production potential from rapeseed led many researchers to seek for the best growth condition of rapeseed in reclaimed lands. The vulnerability of rapeseed to humidity and salinity is well known, and the rapeseed growth in reclaimed paddy fields nearby the coast becomes poor due to poor drainage conditions and the high soil salinity level during the winter. Therefore, this study aimed at determining the optimal installation standard for each type of conduits and evaluating the feasibility of horizontal-closed conduit for better rapeseed production. The installation intervals were varied; 2, 4 and 6m for open conduit and 3, 5 and 7m for closed conduit, respectively. Groundwater level, soil moisture content and salinity reading from the surface and subsurface soils during the study period (January in 2009 through June in 2010) were monitored. The findings of this study were as follows: 1) the impact of installation arrangement and slope was greater than the installation interval in the case of open conduit, 2) the horizontal-closed conduit was very effective to reduce the soil salinity levels, 3) as the installation interval became small, the reduction of salinity level and excessive soil moisture contents increased, and 4) better growth condition and yield of rapeseed were achieved from the paddy fields with good drainage conditions.