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Article type: Cover
1939 Volume 13 Issue 1 Pages
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Article type: Appendix
1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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S. OSUGI, K. KAWAGUCHI
Article type: Article
1939 Volume 13 Issue 1 Pages
1-10
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The authors have already reported that chief cause of the damage in paddy rice field in Kagawa and Okayama prefectures in Japan by am-sulphate manuring, may due to sulphide-formation by the reduction of the manure. The authors continued the experiment in regard to this problem on the relation between redox-potential of soil and the reduction and the results will be summarized as follows; 1. The soil such as its redox-potential is markedly lowered when it was kept under stagnation, reduces sulphate without exception and the reverse is also true. 2. The above lowering of the potential is accelerated a) by the rise of incubation-temperature and b) by the increase of pH of soil by liming. 3. The above acceleration was also proved in the case of sulphate-reduction. 4. The low redox-potential of the damaged soil during summer, gets higher with the elapse of season and in the middle of october when the field was drained, the value reaches almost to that of undamaged soil and the amount of sulphide decreases parallel with the above change of the potential during seasons. 5. The fact shown in 4,indicates that the potential and the amount of sulphide of soil, are not stable but change with the amount of water in rice field.
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Taneo OGIHARA
Article type: Article
1939 Volume 13 Issue 1 Pages
11-15
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The result obtained are as follows : 1. The growing of rice cultivated on soil where previously there was pear garden, was markedly harmful. The length of leaves and stems became shorter, seeds did not ripen completely, and yield decreased. The toxicity seems to be due to poisoning of Pb-arsenate sprayed on the pear orchard before. 2. When 300〜500 lbs per acre of sulphur were added to the soil, there was no visible injury to the plants and it may also be recognized that the arsenic injury to the plants was rather stronger than the injury of lead. The reason toxicity was prevented seem; to be that the arsenic compounds became insoluble by the combination of As and S.
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F. KOYAMA
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1939 Volume 13 Issue 1 Pages
16-20
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M. HORIE
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1939 Volume 13 Issue 1 Pages
21-36
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[in Japanese]
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1939 Volume 13 Issue 1 Pages
37-42
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1939 Volume 13 Issue 1 Pages
43-46
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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[in Japanese], [in Japanese]
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1939 Volume 13 Issue 1 Pages
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Article type: Article
1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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Article type: Appendix
1939 Volume 13 Issue 1 Pages
58-60
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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Article type: Article
1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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1939 Volume 13 Issue 1 Pages
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Article type: Appendix
1939 Volume 13 Issue 1 Pages
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Article type: Appendix
1939 Volume 13 Issue 1 Pages
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Article type: Cover
1939 Volume 13 Issue 1 Pages
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