アブラナ科葉菜類(ハクサイ、チンゲンサイ、キャベツ)の生育、カドミウムおよび必須微量金属吸収に及ぼすカキ殻施用の効果 : Cd添加土壌を用いた土耕ポット試験

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It is said that the application of alkaline material is an effective method of suppressing Cd absorption by plants in Cd contaminated soil. Since the main ingredient of oyster shells is calcium carbonate, it may be thought that the application of oyster shells is effective in suppressing Cd absorption by plants in soil contaminated by Cd, but there are many points which are not understood about this effect. In this study, combinations of the presence or absence of added Cd (1μgg-1) in commercial loamy soil (total Cd ; 0.38μgg-1) and application of calcium carbonate or of oyster shells were made, and the effects of applications of oyster shells on the growth of pak choi (qinggengcai), Chinese cabbage and cabbage, and on their absorption of Cd, Cu, Mn, Fe and Zn were investigated. With the soil without added Cd, the growth of 3 species of plants was less with application of oyster shells compared to application of CaCO3. The Cd concentrations in the leaf were 0.01〜0.04μg DW g-1, and there was no significant difference between applications of oyster shells and CaCO3. With the soil with added Cd, the dry weight of the leaves of the 3 species was about the same with application of oyster shells as with application of calcium carbonate. The Cd concentration in the leaf of cabbage with application of oyster shells was 1.9μg DW g-1, and the Cd content was 2.5μg plant-1, indicating that it is significantly lower than with application of CaCO3. Significant differences in Cu, Zn and Mn concentrations were not seen in the leaf of the cabbage between application of oyster shells and CaCO3, but the Fe concentration was significantly lower with application of oyster shells compared to CaCO3. In addition, the Mn concentration in the leaf of the Chinese cabbage was also significantly lower. From the above findings, it was suggested that there are differences in the effects of application of oyster shells on the suppression of Cd absorption depending on the species of plant.
2011-03-31

アブラナ科葉菜類(ハクサイ、チンゲンサイ、キャベツ)の生育、カドミウムおよび必須微量金属吸収に及ぼすカキ殻施用の効果 : Cd添加土壌を用いた土耕ポット試験

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