Studies on uptake of lead by crops and reduction of it's damage -III. Effect of water management and lime application on Pb uptake in paddy rice

농작물(農作物)에 대(對)한 납(Pb)의 흡수(吸收) 및 피해경감(被害輕減)에 관(關)한 연구(硏究) -III. 수도(水稻)의 납 흡수이행(吸收移行)에 대(對)한 물관리(管理) 및 석회물질(石灰物質)의 효과

A pot experiment was conducted to find out the effects of water management and application of slaked lime and wollastonite on Pb uptake of rice in a Pb added soil. The soil was adjusted to 0, 150, 300 and 600 ppm of Pb concentration. The slake lime was applied at the equivalent amount of lime requirement with 150kg/10a adding and the wollastonite, 200kg/10a, respectively. The results obtained were as follows. 1. The lead contents in leaf stem and brown rice increased with increasing the soil Pb content and the ratio of Pb/(Ca+Mg) equivalent in soil but they showed no influence on yields. 2. The application of lime and wollastonite reduced Pb content in plant. 3. The lead content in plant was higher in intermittently irrigated treatment than in submersed irrigation. 4. The soil pH was increased in the order of lime, wollastonite and control. 5. $1N-NH_4$ OAC soluble Pb content in soil was higher in the submersed irrigation than in the intermittently irrigated and was higher in wollastonite application treatment than the slaked lime after harvesting.

수도(水稻)에서 납(pb) 흡수양상(吸收樣相) 및 흡수경감효과(吸收輕減效果)를 구명(究明)하기 위(爲)하여 토양(土壤)에 납을 0, 150, 300, 600 ppm 으로 처리(處理)하고 소석회(消石灰) 및 규회석(硅灰石)을 시용(施用)하여 pot 재배(栽培)하고 수도(水稻)의 경엽(莖葉), 현미중(玄米中) 납함량(含量) 및 흡수량(吸收量)과 pH, 칼슘, 마그네슘함량(含量)과의 관계(關係)를 조사(調査)한 결과(結果)는 다음과 같다. 1. 토양중(土壤中) 납처리농도(處理濃度)가 증가(增加)할수록 경엽(莖葉)과 현미중(玄米中) 납함량(含量) 및 흡수량(吸收量)이 증가(增加)하였으나 수량(收量)은 별영향(別影響)이 없었다. 2. 석회물질시용(石灰物質施用)으로 수도(水稻)의 납흡수억제효과(吸收抑制效果)가 인정(認定)되었다. 3. 물관리(管理)에서 수도(水稻)의 납흡수억제효과(吸收抑制效果)는 간단관수구(間斷灌水區)가 상시담수구(常時湛水區)보다 좋았다. 4. 토양중(土壤中) pb/Ca+Mg당량비(當量比)가 증가(增加)할수록 식물체중(植物體中) 납함량(含量)이 증가(增加)하였다. 5. 석회물질시용(石灰物質施用)에 따른 토양(土壤)의 pH는 소석회(消石灰)>규회석(硅灰石)>무시용(無施用)의 순(順)이었다. 6. 시험후(試驗後) 토양중(土壤中) $1N-NH_4$ OAC 가용성(可溶性) 납함량(含量)은 상시담수구(常時湛水區)가 간단관수구(間斷灌水區)보다 높았고 석회물질별(石灰物質別)로는 무시용(無施用)>규회석(硅灰石)>소석회(消石灰)의 순(順)이었다.