熔鉱炉塵灰に就て(第2報)

概要

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For the utilization of source of potash fertililizers, the dust of blast-furnace, that is byproduct of iron-works, were investigated on its potash contents, its properties for fertilizers, potash extraction methods, and other constituents that is injurious to plant growth. About70% of total potash of the dust is water soluble, and so water extraction of potash is easy, but practically difficult because of very fine powder, which float on or suspend in water. Dust contains potash 14〜1.7%, in several samples, besides ZnO 14〜2% andPbO about 1% that is assumed harmful to plant growth. Among the extraction methods of potash it is effective to calcine 400℃, 1hr. For rice and barley in pot cultures, dust gave nearly equal amounts of yields to KCl when suppling the same weight of potassium, but for barley dust was. inferior to KCl, but superior when liming. Among N-fertilizers together dust, calcium cyanide are most effective, but ammonium sulfat are not suitable. Fertilizing value of the dust are not determined K_2O%, but amounts of injurious elements, especially Zn, Pb. For examples, it is consider that Honkeiko iron-works' (B), that contains ZnO, Pb, gave injurious effect owing to only Zn, but Yawata's, that contains 14.48%ZnO, 6.77% Pb, combined effects of Zn, Pb.
社団法人日本土壌肥料学会の論文
1951-03-31