초록
토양을 침지한 후 배수, 통기 및 침지를 조합한 처리에서 토양의 Eh와 수분함량을 조사함과 아울러 고추에 대하여 토양단독, 토양+상토+바로크의 혼용처리와 토마토에 대하여 토양단독, 토양+볏짚, 토양+퇴비, 토양+Aeration의 혼용처리를 하여 식물체 엽 중 Fe과 Mn흡수 특성을 구명하기 위하여 포트조건에서 시험을 수행하였다. 토양 환원처리 후 Eh와 토양 수분함량을 조사한 결과, 배수와 Aeration을 처리한 후 72시간부터 토양을 산화상태로 변화시켰으며, 토양 수분함량은 처리와 동시에 감소하기 시작하였다. 정식 후 30일에 채취한 고추 식물체의 엽 중 Fe와 Mn을 분석한 결과, 토양 단독처리구의 식물체 엽 중 Mn은 토양 산성에 의해 과잉 흡수($1,324mg\;kg^{-1}$) 되었으며, 길항작용에 의해 Fe 흡수장애가 나타났다. 혼합 토양 처리구에서의 식물체 엽 중 Mn 함량($947mg\;kg^{-1}$)은 토양 단독 처리구에 비해 적었으나 Fe 흡수장애를 야기하였다. 정식 후 60일에 채취한 토마토 식물체의 엽 중 Fe와 Mn을 분석한 결과에서 Fe 함량은 토양(50%) + 퇴비(50%)처리에서 가장 높았고, Mn 함량은 토양 단독 처리에서 가장 높게 나타났다. 본 시험의 결과로 볼 때 작물의 생육은 Eh 및 공극률이 토양 수분함량과 밀접한 관계가 있으며, 토양이 산성상태일 때 식물체는 토양으로부터 Mn을 우선적으로 흡수하며, 이는 Fe 결핍을 야기하는 것으로 판단되었다.
This experiment was performed to understand the relationship between uptake of Fe and Mn by plants, red pepper and tomato, and soil physico-chemical properties under different soil conditions at an environmentally controlled chamber in NAAS(National Academy of Agricultural Science) in 2008. After the dipping for 3 days, four treatments, dipping, dipping+aeration, drainage, drainage+aeration, were set up to investigate the changes in soil redox potential and moisture content. Drainage+aeration changed soil to the oxidation condition from 72 hrs of treatment, and soil moisture content was immediately reduced after treatment. Uptake of Fe and Mn of red pepper was investigated with two treatments, soil only and the mixed[soil(50%) : bed soil(35%) : bark(15%)]. Red pepper leaves taken at 30 days after treatment absorbed excessively Mn from the treatment of soil only and the mixed, and thus uptake of iron was strongly reduced. Also, uptake pattern of Fe and Mn of tomato was examined with four treatment, soil only, soil(50%) + rice straw(50%), soil(50%) + compost(50%) and soil + aeration. Contents of Fe and Mn in tomato leaves was measured at 60 days after treatment. Fe content was the greatest in soil(50%) + compost(50%) whereas Mn content was the highest in soil only. As a result of this experiment, plant growth was stronger influenced by soil moisture content than redox potential or porosity, and the oxidation status of soil was likely to promote that plant predominantly absorbed Mn from soil and thus resulted in Fe deficiency.
