폐양액과 하수처리수 재이용이 배추생육 및 토양에 미치는 영향

초록

This study evaluated the effect of using waste nutrient solution (WNS) and reclaimed wastewater (WW) on the growth of Chinese cabbage and soil quality. The pH and electrical conductivity (EC) values of waste nutrient solution were 6.3 and 1.5 dS m^-1 and being 6.8 and 0.4 dS m^-1 in reclaimed WW, respectively. WNS found to be included more than 10 g m^-2 of NO_3^-, K^+, SO_4^2- and Ca^2+, thereby enhancing Chinese cabbage growth. However, Cl^- and Na^+ contents were higher than other nutrients in WW. Among the three irrigation resources,no significant differences were found for the growth of Chinese cabbage plants. On the other hand, pH was decreased in WNS-treated soil when compare to that in WW-treated soil which pH was increased. In spite of the uptake of nutrients by the growing plants, irrigation of the WNS led to an increase in available P2O5 and exchangeable cations such as K^+ and Mg^2+ in the soil when compared to soil that irrigated by groundwater or WW. Taken together, the use of WNS can remarkably reduce the amount of the chemical fertilizer for Chinese cabbage production; however, WNS can possibly cause a problem as nutrients accumulation in soil.

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