-
Article type: Cover
1940 Volume 14 Issue 8 Pages
Cover1-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Kazumi KAWAMURA, Tsuneo INAGAKI
Article type: Article
1940 Volume 14 Issue 8 Pages
469-484
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
1. The carbon content in 36 surface soils of all sorts, varied from 1.2 to 7.4 per cent, the average being 33 per cent. The average value for the carbon : nitrogen ratio was found to be 11.4. 2. Rota limestone-soils are saturated with calcium, the pH values being near 7 or more. They have no exchange acidity. The base-exchange capacity is extremely low. The colloidal clay-fraction has such silica : sesquioxide ratios as low as 0.2. The corresponding ratios for the fine soil are also nearly the same. The soils contain appreciable amounts of lime and magnesia, indicating that the leaching is still incomplete. 3. Brown-colored limestone-soils are nearly saturated with calcium. The pH values are about 7 or less. Resembling the Rota soils, they have no exchange acidity but low hydrolytic acidity. The colloidal SiO_2/R_2O_3 ratio is approximately 1.0,the SiO_2/Al_2O_3 ratio being 1.2. The corresponding ratios for the fine soil are, in many cases, about 0.1 higher than above figures. 4. In major cases, the red-colored limestone-soils are nearly saturated with calcium, while in minor cases, the soils are unsaturated and the acidities increase with the depth of soil layer. The colloidal sillica : sesqnioxide ratios are 1.1〜1.4 in approximation. 5. As compared with the other limestone soils, the yellow-colored soils are more acid and less saturated. In many cases, their exchang acidity and hydrolytic acidity increase with the depth of soil profile. The degree of saturation for two subsoils was found to be approximately 70% The base-exchange capacity is relatively high. The colloidal silica : sesquioxide ratios are 1.3〜1.5. 6. The acidities of non-limestone soils vary, in general, according to the place of soil occurence. Thus, in some cases, the soils are quite neutral throughout the whole profile; while in other cases, they are more acid, and the acidities increase or decrease with the depth of soil layer. The former cases are found in places where lime is abundantly supplied from the neighbouring limestone for neutralization. The andesite soils occuring on the summit of the Rota mountain, are strongly acid, the acidities decreasing with the depth. The degree of base-saturation is only 9 per cent for the subsoils. The silica : sesquioxide ratios for andesite soils vary with the place of occurence. The soils from tertiary rocks excluding limestone, have high base-exchange capacity. The degree of saturation is about 60 per cent. The colloidal silica : sesquioxide ratios are 2〜3. 7. The contents of phosphoric acid and potash, that are soluble in 0.2 n HCl, also vary with the locality of soil. However, in major cases, the contents are higher in surface soils than are in subsoils. Averaging the amounts, obtained with 29 surface soils and 21 subsoils from various limestonesoils, the following figures were found as mean values for the two nutrients.[table]As will be seen, the quantitses of potash are markedly low, indicating its general lacking for limestone-soils. The field experiments also prove this fact. 8. The soils that were normally formed before reclamation from volcanic rocks and tertiary rocks, including old and impure limestones, under the dense forestcondition, would be assumed to be the yellow-colored soils. The soil-forming process then prevailed, should have been weak podsolization. The red-colored soils seem to be products of partial oxidation and weak laterization from the yellow-colored soils. The brown-colored soils from soft and coarse-structured limestone, also seem to have been normally developed under the cover of dense forest. But in this case, the supply of lime should have been large enough for neutralizing the humus produced. 9. In external appearance, the red-colored limestone soils resemble Terra Rossa; but they differ in that the soils are allitic in composition, although they have no evidence of being laterite. The brown-colored limestone-soils resemble
(View PDF for the rest of the abstract.)
View full abstract
-
Rokuro KAWASHIMA, Masanao NAGATA, Gen-ichiro SUYAMA
Article type: Article
1940 Volume 14 Issue 8 Pages
485-492
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
In this paper the Chemical properties of reclaimed marsh soils enclosed by dyke in 1937,is dealt with. 1. The pH-values of surface soils are 7.49〜7.74 and those of subsoils 7.67〜8.52. 2. Although the water soluble ash contents of fairly reclaimed surface soils are about 0.3%, those of still almost unreclaimed surface soils are about 1.2%, and those of all subsoils are about 2.0%. In 100 parts of ash substances NaCl occupy about 80 and sulphates follow that. 3. In 100 parts of exchangeable cations Mg occupy 39.4〜47.4 parts and sums of K and Na are 25.0〜33.8. 4. The silica-alumina ratios of colloidal clays below 1μ in diameter are about 4.8 in surface soils and about 3.7 in subsoils. The colloidal clays in surface soils may contain some quartz.
View full abstract
-
Koki YAMAUCHI
Article type: Article
1940 Volume 14 Issue 8 Pages
493-502
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Author make an experiment of the nitrogen utilization by the mulberry trees in two soils of different character for two years. The chief results are as follows; (1) Nitrogen utilization of the chief nitrogenous manures by the mulberry trees in both volcanic ash clay soil and tertiary loam soil, are as in following table;[table](2) Nitrogen utilization of each manures in tertiary loam soil are less than in volcanic ash clay soil, and then it is thought that is due to less NH_3-adsorption of tertiary loam soil than the latter.
View full abstract
-
Hideo MISU
Article type: Article
1940 Volume 14 Issue 8 Pages
503-520
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Teru HIRANO
Article type: Article
1940 Volume 14 Issue 8 Pages
521-530
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
A study was made concerning to the nature and extent of soil-sickness on the tomato. The experiments are excuted by continuous planting in pots. Emp. hasis was placed on the nature of soil-sickness and on the chemical composition of the sicked soils. The results are summarized as follows : 1) In the optimum soil reaction, (pH 5.26〜5.18 N KCl, soluble CaO 0.30〜0.35%) the soil sickness does not occur till at least the third planting. The former planting seems to stimulate the growth of the next planting. 2) In the unsuitable soil reaction (over the pH 6.4 KCl, soluble CaO 0.37%) the first planting of tomato got some growing, great curtails, to a great extent, the growth of the next plantings and the amount of the third yield was smaller than that of the second. 3) The critical point at which the soil showed the phenomenon of soil sickness to the tomato is indicated by the curve of Fig I. According to the figure, seems to be about the place where is contained 28% exchangeable hydrogen against the total base exchangeable capacity. From this fact it is clear that continuous planting may be possible on the soil containing more than 28% hydrogen, and that if the percentage of hydrogen is decreased and that of calcium is increased instead, soil-sickness will appear. 4) The decomposition products of tomato root is a cause of soil sickness of next plantings.
View full abstract
-
Takeo NAGATA
Article type: Article
1940 Volume 14 Issue 8 Pages
531-536
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
537-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
537-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
537-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
537-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
537-538
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
538-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
538-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
538-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
538-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
539-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
539-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
539-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
539-540
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
540-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
540-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
540-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
541-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
541-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
541-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
541-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
541-542
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
542-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
542-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
542-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
543-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
543-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
543-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
543-544
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
544-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1940 Volume 14 Issue 8 Pages
544-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1940 Volume 14 Issue 8 Pages
545-546
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1940 Volume 14 Issue 8 Pages
App1-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1940 Volume 14 Issue 8 Pages
Cover2-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1940 Volume 14 Issue 8 Pages
Cover3-
Published: August 25, 1940
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS