The total contents of iodine in sixty virgine soil samples from various parts in the middle and western districts of Japan studied varied between 0.00 and 58.12 p.p.m., average for all the soils 19.94 p.p.m. The clayey soils contained the largest amoun t of iodine which was followed by the loam, clayey loam, sandy loam and sand soil in the order. The soils of larger pH contained more iodine on average. The humus content of soil appeared to have the correlation with the iodine content. Generaley, if the former is rich, the latter also abound. Considering the results fro m the soil origin, the dilluvial soil contained the largest amount and the volcanic ash soil was next. No correlation was found between the iod i n e content and the total Fe, Mn, Ca, Ti contents of the soil.
Mendeley出力
