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Article type: Cover
1937 Volume 11 Issue 2 Pages
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Article type: Appendix
1937 Volume 11 Issue 2 Pages
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Shigeru OSUGI, Moiti AOKI
Article type: Article
1937 Volume 11 Issue 2 Pages
109-115
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It was reported in the preceeding paper that the tea garden soil of low fertility in Uji district is mostly distributed in diluvial region, while the fertile, in the same district is generally of an alluvial nature and that a marked difference was found in the physical and chemical properties between the poor and good soils, especially in the content of inorganic constituents soluble in hot cons. HCl, as in the following table : [table]In order to determine whether the inorganic constituents of the tea-plants growing in both soils are affected by the above differences, leaves and roots of each plant were analysed with the following results.[table]The above table shows that in the plant of the poor soil, the amount of aluminium, manganese and phosphorus is greater and that of calcium, less., which is expected from the difference of both soils. The present writers consider that this marked difference of the ash-constituents of the plants has an important relation with the fertility of both soils and will continue further investigation.
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E. KAMATANI, K. KAGIYAMA
Article type: Article
1937 Volume 11 Issue 2 Pages
116-122
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Yuhu Kuno
Article type: Article
1937 Volume 11 Issue 2 Pages
123-132
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The experiments were held about the composition of the rice straws 4 species 37samples produced in the Northern Chosen where the climatic condition of temperature, sunshine are bad, and 8 species 21 samples in the Southern Chosen where these condition are better. The influence of the bad climate upon the composition are : Both total nitrogen and protein nitrogen are high, but non-protein nitrogen has not any distinct tendency. Cellulose and lignin are always low. Crude ash and silica are much contained. The tendency can be recognized that there are much phosphor and kali but a little calcium in ash. It seems to be the cause of the frail quality of the rice straws that there are much inorganic matter as silica, phosphor and kail ; on the other hand, there are few organic matter as cellulose, lignin which make the frame of the plants, but much protein, Nawa (straw-rope) and Kamasu (straw-bag) produced in Northern Chosen is too frail to be used for.
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Masataka OHMASA
Article type: Article
1937 Volume 11 Issue 2 Pages
133-138
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Since the discovery by M. F. Lauro that selenium is an effective catalyst in Kjeldahl nitrogen determinations, many investigators have devoted additonal study to its use, and several of them have found that on long heating this element is liable to reduce the amount of nitrogen obtained in the analysis. To obviate the danger of loss of nitrogen, A. E. Beet and D. G. Furzey have suggested the use of a mixed selenium-mercury catalyst which materially shortens the digestion period, and they have also suggested a mere 10 minutes' "after boil." Such a catalyst, however, necessitates the use of a precipitant for mercury. The present paper deals with the results obtained when selenium is used with copper sulphate and phosphoric-sulphuric acid. In the experiment gas heat was used. 10 cc of phosphoric-sulphuric acid (this was prepared by dissolving 200 gms of anhydrous phosphoric acid in 1 litre of concentrated sulphuric acid) and 0.3gm of the catalyst mixture, consisting of an equal part of selenium and copper sulphate, were added to each sample (0.1 gm of pure organic compounds and 0.5 gm of natural organic substances) to be digested. Comparisons were made, both as regards speed and accuracy, between the copper sulphate method, the selenium method and the writer's new method. From the resuts obtained in this investigation it may be stated that the new method has the following advantages. 1. The digestion periods are considerably shortened so that it can be accomplished in 30 minutes or less ; 7-15 minutes is used to clear the liquid and 15 minutes suffices for the "after・boil." Compared with the copper sulphate method, the time of digestion taken by the new method is from 1/2 to 2/3 less without impairing the accuracy of the determination. 2. This method does not require the use of a precipitant in distillation. 3. Copper sulphate in the catalyst mixture serves as an indicator when concentrated sodium hydroxide is added to the acid before distillation, and the excess of the hydroxide can be saved.
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Y. HAYASHI, J. KOBAYASHI
Article type: Article
1937 Volume 11 Issue 2 Pages
139-142
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R. KAWASHIMA
Article type: Article
1937 Volume 11 Issue 2 Pages
143-154
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The Okinawa (Riukiu) island lies in lat. 26°52.3'〜26°0.2' between Formosa and Kyushu. As to the climate, it is hot and wet, and the rainfall distributes rather evenly throughout the year, as the records for the last 43 years of Naha meteorological station show in table I.[table]The Soil samples of different geological origin were collected and analysed. The analytical results for several representative soil samples are given in the table II.[table]In the table II a predominant influence of CaCO_3 in parent material on the soil forming process can be observed and there is an interesting contrast between Ca-and H-Soil.
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J. HIRANO
Article type: Article
1937 Volume 11 Issue 2 Pages
155-162
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R. KAWASHIMA
Article type: Article
1937 Volume 11 Issue 2 Pages
163-170
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To a highly acidic mineral Soil added CaCO_3 in ascending rates of amount and cultivated horse bean, Mokusiku (Medicago denticulata Willd), red clover and lucerne. The optimum soil reaction for these crops are as follows : [table](1) This Journal. Vol. IX. No. 4. (1935)
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[in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
171-173
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[in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
174-180
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[in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
181-184
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[in Japanese], [in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
185-187
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Article type: Article
1937 Volume 11 Issue 2 Pages
188-191
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[in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
192-193
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[in Japanese]
Article type: Article
1937 Volume 11 Issue 2 Pages
193-194
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
196-197
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
197-198
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
198-199
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
199-200
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
200-201
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1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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Article type: Article
1937 Volume 11 Issue 2 Pages
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1937 Volume 11 Issue 2 Pages
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