@article{oai:niigata-u.repo.nii.ac.jp:00004062, author = {本間, 利光 and 大峽, 広智 and 大山, 卓爾}, issue = {1}, journal = {日本土壌肥料學雜誌, 日本土壌肥料學雜誌}, month = {Feb}, note = {異なる水田転換畑において栽培されたダイズ子実Cd濃度に及ぼす抽出液塩酸濃度や畑転換履歴,リン酸吸収係数の影響を検討し,既存の0.1M塩酸抽出土壌Cd濃度や土壌pH(H_2O)を用いたダイズ子実Cd濃度の推定を試み,以下の結果を得た.(1)畑転換初年目のダイズ子実Cd濃度は転換2年目以上の圃場より有意に高く,その原因として石灰施用による土壌pHの上昇が原因であると思われた.(2)全てのサンプルにおいてダイズ子実Cd濃度と高い相関がみられた抽出液は0.01M塩酸溶液であった.この抽出液はリン酸吸収係数が高い土壌ほどCd抽出率が劣った.(3)リン酸吸収係数1,100未満の土壌では,交換態Cd濃度がダイズ子実Cd濃度と高い相関が認められ,土壌中でのCd吸着体の違いを反映しているものと考えられた.一方,0.1M塩酸溶液はダイズ子実Cd濃度との相関は低かった.(4)畑転換初年目でリン酸吸収係数1,100未満の圃場においては,0.1M塩酸抽出土壌Cd濃度と土壌pHを用いることでダイズ子実Cd濃度を推定することが可能であった.(5)これらにより,土壌Cd濃度に応じた土壌pHの改良目標値を示すことや,リスクマップの作成が可能となった., This study was conducted to estimate the concentration of cadmium (Cd) in soybean seeds in different upland fields converted from paddy fields using Cd concentration in soil extracted with 0.1M HCl, soil pH, phosphate absorption coefficient and history of field conversion. A summary was follows. (1) The concentration of Cd in soybean seeds grown in the converted upland field from paddy field at the second year or longer period was significantly lower than that of seeds in the first year after conversion. This reason was the increase of soil pH due to the application of liming material. (2) The Cd concentration in soil extracted with 0.01M HCl was correlated with the Cd concentration of soybean seeds. The extraction efficiency of Cd with this solution was decreased as rising of the phosphate absorption coefficient, which is a major indicator of Cd absorption in soil. (3) The exchangeable Cd concentration extracted with 0.05M Ca(NO_3)_2 had a high correlation to the Cd concentration of soybean seeds in low phosphate absorption coefficient soil, because the Cd was adsorbed with the different surface functional group in soil and main adsorbents of Cd was the negative charge of siloxane surface in 2:1 type clay mineral. (4) In upland fields which were in the first year converted from paddy field and less than 1,100 of the phosphate absorption coefficient, the estimation of Cd concentration of soybean seeds using the soil Cd concentration extracted with 0.1M HCl and soil pH was practical used. The Cd concentration of soybean seeds in other soils was lower than that of above descript soils significantly. (5) Thus, it had been possible to estimate concentration of Cd in soybean seeds at the less than 5% level of significance using above data, to set the target of improvement of soil pH suitable for different soil Cd level and to make the Cd risk map for soybean.}, pages = {7--14}, title = {0.1M塩酸抽出カドミウム濃度および土壌pHからのダイズ子実カドミウム濃度の推定}, volume = {82}, year = {2011} }