水田土壌及び畑地土壌に関する研究

概要

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In order to test the effect of water stagnancy on soil properties, some profile studies were conducted on the soils of both paddy and dry field conditions. Samples were collected in pair from both fields which lie near by and were cultivated under the same manurial treatment for a long time. The experimental results are summarized as follows : 1) No distinct regular difference in the mechanical composition of soil was found in both fields. 2) pH value of paddy field soil was generally higher than that of the dry field. 3) Carbon-nitrogen ratio of paddy field soil showed maximum in certain layer and in case of dry field soil, it decreased gradually with depth. 4) Colloid materials separated from both soils, were analysed and the following conclusion is made with the results. a) A slight accumulation of aluminium in certain layer was found in dry field condition but in case of the paddy field, the aluminium content of colloid increased with depth. b) A marked accumulation of iron in certain layer was determined in paddy field soil but not in the dry field and this shows that iron compound of soil is made moveable in paddy field condition. It was also found that the above movement of iron took place mainly in oxide-form-iron of soil.
社団法人日本土壌肥料学会の論文
1937-08-10