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Article type: Cover
1941 Volume 15 Issue 4 Pages
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Published: April 25, 1941
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Article type: Appendix
1941 Volume 15 Issue 4 Pages
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Article type: Index
1941 Volume 15 Issue 4 Pages
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Published: April 25, 1941
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Kazumi KAWAMURA, tsuneo INAGAKI
Article type: Article
1941 Volume 15 Issue 4 Pages
217-226
Published: April 25, 1941
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1. Studies were carried on the three profiles of the terra-rossa-like soils occuring in "the great limestone bed" region (paleozoic) in western Chosen. In this district, the climate is rainy and hot in summer, whilst in winter dry and cold. The rain and N-S factors rather resemble those of brown forest soil zone than the Mediterranean factors. 2. The soils are composed of brownish red clay, tinged with purple, throughout the vertical section. However, the color of arable soil-horizon is somewhat faded, and the bottom horizon slightly light. 3. The top horizon (A_1) posesses a crumble structure of fairly good degree. The crumb or soil lump, however, gradually increases in size with depth, so that the structure gradually turns into coarse-granular (A_2) and then nutty (B) structures. Then the latter gradually merges into the bottom horizon (C_1) which is consistedof chemically well-weathered debris or detritus of shale. This is composed of brow nish red clay, being coated with black film of iron oxide. This horizon overlies the bed rock, limestone or dolomite. 4. The soils contain markedly large amounts of clay fraction and no gravel; sand and silt fraction being correspondingly small. The amount of sand seems to slightly increase with increasing depth of the soil horizon. 5. The pH of the soils ranges between 6.5 and 7. It gives no appreciable variation with varying depth of the horizon. The hydrolytic acidity is low and shows a decreasing tendency with increasing depth. 6. The total exchange-acidity, as determined by the ammonium acetate method, is 12〜17 m. e. This figure resembles that obtained by del Villar with Spanish soils. The capacity decreases with increasing depth. 7. The degree of base-saturation was found to be 80〜85% in one case, and 90〜95% in other two cases of the profile. Calcium occupies 40〜45% and magnesium 30〜40% of the total exchangeable, strong bases. The former percentage decreases while the latter increases with depth. 8. The chemical composition seems to resemble that of south French terra-rossa which has been given by Blanck as an analytical example in his book. The soils are generally more rich in magnesia than lime, and in potash than soda. The composition gives no marked variation with varying depth. 9. The molecular ratios SiO_2/Al_2O_3 and SiO_2/R_2O_3 of the colloidal clay fraction were found to be respectively 2.5〜2.8 and 2.0〜2.3.
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Shunji FUKUDA
Article type: Article
1941 Volume 15 Issue 4 Pages
227-236
Published: April 25, 1941
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To a highly acidic mineral soil of diluvial series added slaked lime so that 25,50,75,100,125 and 150% of the exchangeable hydrogen was neutralized, and cultivated Mulberry tree. The following results are obtained. (1) The growth and yield of Mulberry tree are best on the soil which 50% of the exchangeable hydrogen was neutralized. (2) The percentage of nitrogen, lime and crude ash in mulberry leaves increase with increasing additions of slaked lime, but the total carbohydrate and crude fibre are the reverse. The protein content, water soluble carbohydrate, ether soluble substances, phosphorus and potash in leaves are maximum on the 50% neutralized soil. (3) The reaction and exchangeable lime content of each plot are showed in a following table.[table]From the above results it appears to be that the optimum degree of neutralization of soil on mulberry cultivation is about 60% of exchangeable hydrogen.
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Singo FUNABIKI, Makoto TODO
Article type: Article
1941 Volume 15 Issue 4 Pages
237-246
Published: April 25, 1941
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Kinjiro YAMANAKA
Article type: Article
1941 Volume 15 Issue 4 Pages
247-262
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
263-278
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
279-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
279-280
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
280-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
280-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
280-281
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
281-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
281-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
281-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
281-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
281-282
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
282-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
282-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
282-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
283-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
283-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
283-284
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
284-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
284-
Published: April 25, 1941
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[in Japanese]
Article type: Article
1941 Volume 15 Issue 4 Pages
284-
Published: April 25, 1941
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Article type: Appendix
1941 Volume 15 Issue 4 Pages
285-286
Published: April 25, 1941
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Article type: Appendix
1941 Volume 15 Issue 4 Pages
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Published: April 25, 1941
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Article type: Cover
1941 Volume 15 Issue 4 Pages
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Published: April 25, 1941
Released on J-STAGE: June 30, 2017
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