코이어 배지(코코넛 분말:섬유=70%:30%, v/v)를 이용한 착색단고추 수경재배에서 공급 배양액의 적정 농도를 구명하자 EC 2.5, 3.0, 3.5 및 $4.0dS{cdot}m^{-1}$의 농도를 공급하였다. 생육 기간 동안 배양액의 급액 농도에 따른 슬라브 내의 EC는 급액 농도가 높아지면 증가하는 경향을 보였으며, 수분 함량은 반대의 경향을 보였다. 배액의 pH는 안정적이었으며, EC는 급액 농도 EC $4.0dS{cdot}m^{-1}$에서 EC $7.3dS{cdot}m^{-1}$로 높았을 뿐만 아니라 표준편차와 변이계수도 높았다. 초장은 급액농도 간 큰 차이를 나타내지 않았다. 광합성율은 급액 농도 EC $4.0dS{cdot}m^{-1}$에서 전반적으로 높았다. 과중은 급액 농도 EC $4.0dS{cdot}m^{-1}$에서 가장 무거웠으며, 과형은 급액 농도 EC $3.5dS{cdot}m^{-1}$에서 정사각형에 가까웠다.
This experiment was carried out investigation of optimum concentration of supply nutrient solution in hydroponics of sweet pepper using coir substrates (coconut dust fiber=70% : 30%, v/v). During the growing period, it was found out that the electric conductivity (EC) would increase in proportion to the supply nutrient concentration but it was in inverse proportion to the moisture content. The pH of drainage was stable, while EC was high showing EC $7.3;dS{cdot}m^{-1}$ in EC $4.0;dS{cdot}m^{-1}$ of supply nutrient concentration. Also, standard deviation and coefficient of variation were high. Plant length was no difference by the supply nutrient concentration. Photosynthesis rate was generally high in supply nutrient concentration EC$4.0;dS{cdot}m^{-1}$. Fruit weight was heavy in supply nutrient concentration EC $4.0;dS{cdot}m^{-1}$, fruit shape was close to a regular square in supply nutrient concentration EC $3.5dS{cdot}m^{-1}$.
