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Article type: Cover
1989 Volume 33 Issue 1 Pages
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Article type: Cover
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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M. Saigusa
Article type: Article
1989 Volume 33 Issue 1 Pages
1-
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Kazuhiko YAMAMOTO
Article type: Article
1989 Volume 33 Issue 1 Pages
2-16
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Characteristics and humus composition of several soils derived from volcanic ash deposits were studied. These soils were Red/Brown loam (R/BL), Yellow-brown loam (YBL), Yellow-brown pumice soil (YBP) and Recent soil from volcanic ash (RSVA), classified according to the New Zealand Soil Classification System. Samples were taken from the four volcanic regions in the North Island. The main findings are as follows : 1) The carbon content of the topsoil in the older volcanic ash soils (R/BLs and YBLs) generally exceeded 10%, while that of the younger YBPs was usually less than 7%. 2) The Phosphate absorption coefficient of R/BLs and YBLs was generally higher than that of the YBPs and RSVAs. 3) The base saturation percentage of RSVAs was considerably higher than that of the other volcanic ash soils. 4) Humic acids in YBPs were usually the B-type with the A-type as a mi- nority, while those in YBLs were dominantly of the P-type. Most P-type humic acids in YBLs exhibit P_<++> and P_<+++> type features. 5) The Ch : Cf ratios of RSVAs and YBPs were higher than those of YBLs and R/BLs, in general. 6) According to the present study, the humus content and the degree of humification in New Zealand volcanic ash soils were generally lower than those of ordinary Japanese "Kurobokudo" (volcanic ash soils).
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Katsutoshi SAKURAI, Shigeru ARAKI, Takahiko NAGANAWA, Goro IWATSUBO, T ...
Article type: Article
1989 Volume 33 Issue 1 Pages
17-29
Published: June 30, 1989
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In the tropics, "waste lands" resulted from various man-made impacts have been expanding at a remarkable rate, with a further demand for economical development to sustain increasing population. Above all, forest destruction is a serious problem brought about by shifting cultivation, over-cutting for fuel wood, forest fire, over-grazing, mining, and so on. Thus, reforestation is an urgent demand. For the purpose of improving the biological productivity or these tropical waste lands in Thailand, four experimental sites were selected : 1). Takua Pa tin mining area, 2). Ratchaburi over-cutting area, 3). Somdet lowland shifting cultivation area, and 4). Huey Tung Jaw highland shifting cultivation area. Compared with the soils under original vegetation, it can be concluded or suggested that soils from the cultivated area had following specific problems such as; 1). lack of clayey materials for optimum water and nutrient retention, 2). physical hazard for root growth caused by the hardening of soft plinthite, 3). nutrient deficiency in the original materials and subsequent deprivation by intensive cultivation, and 4). dense coverage of weeds which suppressed the growth of planted trees.
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Hiroo OTSUKA, Masanori MITSUCHI, Shigemitsu ARAI
Article type: Article
1989 Volume 33 Issue 1 Pages
30-36
Published: June 30, 1989
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The nature of humus from Andosols (Kurobokudo), being characterized by Kumada's A-type humic acid, is generally different from that of other soils. This may be used for identifying Andosols. There is, however, a problem in ascertaining humus nature in the field during the soil survey operations, because the standard laboratory procedure for classifying humus type is rather involved. A simple and rapid test for humus nature has been proposed in this paper, based on strong adsorbability of the A-type humic scid on Sephadex gels. A fresh soil sample is put in a 10ml test tube to a depth of ca. 1cm from the bottom. About 5ml of a 0.1N NaOH solution are added to the tube, shaken for about 5 min., and then filtered after adding ca. 1ml of a 15%Na_2SO_4 solution to coagulate clay particles. A 1ml of aliquot of the filtrate is put into an 8ml test tube containing 80 mg Sephadex G-100 powder. After shaking the suspension is filtered and the Sephadex powder remaining on the filter paper is washed with water. The coloration of sephadex due to sorption of humic acids is compared with the Munsell soil color. The color values of 6 or less is due to sorption of the A-type humic acids, the presence of which is taken as a good indication of Andosols. The B- or P-type humic acids give the color value of 7 or more and the Rp-type humic acids 8 or more, all being indicative of non-Andosols. Thus, the simple Sephadex test can be adopted as a field method for identifying Andosols.
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K. Yonebayashi
Article type: Article
1989 Volume 33 Issue 1 Pages
37-48
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Hideo OHASHI
Article type: Article
1989 Volume 33 Issue 1 Pages
49-58
Published: June 30, 1989
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General background of the Republic of Honduras, its agricultural situations and soil conditions are introduced. The soil in the fields of the Regional Office of the Ministry of National Resources in La Esperanza in western Honduras were investigated. The chemical properties are summarized below: 1) The pH of the soils was low owing to the eluviation of bases. 2) The phosphate absorption coefficient was quite high and there was little available phosphate because of the large amounts of active iron and aluminum. The soils may be classified into Plinthic Acrisols. Intensive studies of soils in Honduras are necessary to improve and increase agricultural productivity.
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I. Kanno
Article type: Article
1989 Volume 33 Issue 1 Pages
59-66
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H. Hirai, K. Sakurai, H. Hirotani, A. Torii, K. Yonebayashi
Article type: Article
1989 Volume 33 Issue 1 Pages
67-74
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H. Obara, H. Otsuka, M. Mitsuchi
Article type: Article
1989 Volume 33 Issue 1 Pages
75-83
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Y.K. Urushibara
Article type: Article
1989 Volume 33 Issue 1 Pages
84-85
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[in Japanese]
Article type: Article
1989 Volume 33 Issue 1 Pages
86-87
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[in Japanese]
Article type: Article
1989 Volume 33 Issue 1 Pages
87-89
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[in Japanese]
Article type: Article
1989 Volume 33 Issue 1 Pages
89-90
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[in Japanese]
Article type: Article
1989 Volume 33 Issue 1 Pages
90-91
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
92-94
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
95-96
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
96-97
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Appendix
1989 Volume 33 Issue 1 Pages
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Article type: Cover
1989 Volume 33 Issue 1 Pages
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Article type: Cover
1989 Volume 33 Issue 1 Pages
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