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Article type: Cover
1939 Volume 13 Issue 7 Pages
Cover1-
Published: July 25, 1939
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Article type: Appendix
1939 Volume 13 Issue 7 Pages
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Article type: Index
1939 Volume 13 Issue 7 Pages
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Article type: Appendix
1939 Volume 13 Issue 7 Pages
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Isenosuke ONODERA
Article type: Article
1939 Volume 13 Issue 7 Pages
409-415
Published: July 25, 1939
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1. As the quantitative estimation of the law of Minimum, the calculated value by the following formula , , a'' is much more in accord with the real amount of crop production than the formula , , b'' : - y = A + Bx - Cx^2 ........................ (a) log(A - y) =K - Cx ................... (b) In these formula A (in the formula , , a''), B, C and K are constant, and A (in the formula , , b'') represents the maximum amount of crop production while y denotes the amount of crop production when minimum element x in applied. 2. The method of calculation of economical quantity of certain fertilizer appliablo in connection with the law of diminishing return was given by the above mentioned formula , , a'' in the case of rice culture.
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H. MISU
Article type: Article
1939 Volume 13 Issue 7 Pages
416-424
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R. KAWASHIMA
Article type: Article
1939 Volume 13 Issue 7 Pages
425-436
Published: July 25, 1939
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The citrus soils in Kyushu comprise a variety of soils derived from various parent material, namely, andesite, granite, volcanic debris, paleozoie formation, Archaean, dilluvium etc. Soil textures range from light to very heavy, and mix plenty of gravel. The soils are deep and well drained The species of citrus cultivated is mainly "loose skin orange" (Citrus unschiu Marc.) Both the reaction and lime saturation of soils, collected from famous citrus regions in Kyushu, were determined. In these regions the adequate liming, for example, 1125 kg. slaked lime per hectare every other year, are commonly practised. Green manuring and mulching are also common. The analytical results are summarised as follows : Reaction and lime saturation of citrus soils. [table] It appears to be that the optimum soil pH is about 6 and its lime saturation is about 55 per cent., although the citrus makes a good growth within a wide range of both soil reaction and lime saturation.
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S. ARAKAWA
Article type: Article
1939 Volume 13 Issue 7 Pages
437-440
Published: July 25, 1939
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M. TOKUOKA, S. GYO
Article type: Article
1939 Volume 13 Issue 7 Pages
441-450
Published: July 25, 1939
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Die Tatsache, dass die Wurzel der Pflanzen im nahrstoffarmen Medium viel mehr sich verlangert als im nahrstoffreichen Medium, wurde bereits von verschiedenen Forschern bei verschiedenen Pflanzen beobachtet. Die vorliegende Arbeit wurde dazu ausgefuhrt, um dieses Tatsache noch genauer aufzufassen und ihre Ursache aufzuklaren. Die Versuchspflanzen ist die Reispflanze. Fur Wasserkultur der Reispflanzen wurden drei Losungen, deren Konzentration 1,^1/_2 und ^1/_4 betragten, hergestellt. Kurzzusammenfassend war der Entwicklungszustand der Wurzel am Ende der Vegetation folgendes : Die Reihenfolge der Wurzelzahlen ist Losung 1,^1/_2 und ^1/_4,bei Wurzellange aber herrscht das Gegenteil, d. h. die Losung ^1/_4 hat die langste Wurzel. Also die obengenannte Tatsache wurde hier weder auf gefasst. Die Ursache mag vielmehr in oekologischen als physiologischen Bedingungen liegen. Die Nahrstoffmenge fur normale Entwicklung der Pflanzen ist etwa bestimmt. Um diese Menge der Nahrstoffe zu absorbieren, sollen die Wurzel bei verdunnter Losung ein geraumigeres Volumen brauchen als bei konzentrierterer Losung, deshalb bei diesem Falle verteilt sich die Wurzel mehr nach unten. Bei der konzentrierter Losung kann die Pflanze die fur normale Entwicklung genotigte Menge der Nahrstoffe in verhaltnissmassig kleinem Volumen der Losung absorbieren, wenn die Pflanze eine dichte Masse der Wurzel habe.
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S. MORITA
Article type: Article
1939 Volume 13 Issue 7 Pages
451-460
Published: July 25, 1939
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Author studied the oxidation-reduction potentials of the profiles of orchard and tea garden soils and the results are summarised as follows : 1) Orchard soil (alluvial) The potential had a close relation with tree growth and fruit production, i. e., poor soil showed always lower potential than richer soil and this is more distinct in the deeper horizon of the profile. 2) Tea garden soil (alluvial and diluvial) The potentials of both poor and rich soil were studied, and as shown in 1), poor soil showed lower potential than richer soil again. 3) From these results, it will be concluded that the low productivities of orchard and tea garden soils may be partly attributed to the reduced state in the soil
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Kinsi SUMINOE, Minbu TANAKA
Article type: Article
1939 Volume 13 Issue 7 Pages
461-462
Published: July 25, 1939
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Studied on 11 soil-samples collected at scveral districts in North-china and Inner-mongoria Azotobacters were found in all samples, and of 8 samples Az. chroococcum var. only, of 3 samples besides Az. Beijerinckii var.
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
463-464
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
464-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
465-
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
465-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
465-466
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
466-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
467-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
467-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
467-468
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
468-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
468-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
468-
Published: July 25, 1939
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[in Japanese]
Article type: Article
1939 Volume 13 Issue 7 Pages
468-
Published: July 25, 1939
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Article type: Appendix
1939 Volume 13 Issue 7 Pages
469-472
Published: July 25, 1939
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Article type: Appendix
1939 Volume 13 Issue 7 Pages
472-
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Article type: Appendix
1939 Volume 13 Issue 7 Pages
App3-
Published: July 25, 1939
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Article type: Cover
1939 Volume 13 Issue 7 Pages
Cover2-
Published: July 25, 1939
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Article type: Cover
1939 Volume 13 Issue 7 Pages
Cover3-
Published: July 25, 1939
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