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Article type: Cover
1996 Volume 40 Issue 1 Pages
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Article type: Cover
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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S. Kondo
Article type: Article
1996 Volume 40 Issue 1 Pages
i-ii
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Y. Tokashiki
Article type: Article
1996 Volume 40 Issue 1 Pages
1-
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Jaime G. MONTESUR, Rodrigo B. BADAYOS, Shizuo NAGATSUKA
Article type: Article
1996 Volume 40 Issue 1 Pages
2-10
Published: June 30, 1996
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A study was conducted in two farming villages in Padre Garcia, Batangas, Philippines to identify and classify existing farming systems using a proposed framework for farmign systems classification. Since this was just the first approximation, a semi-quantitative approach was done using the relevant criteria such as soil/land use suitability, market orientation, level of capital, labor intensity, power source, level of technical management, farm size, infrastructure support and tenurial status. Based on the soil/land use suitability assessment in the study area, the results showed that the existing soil/land uses for annual crops were moderately suitable. The most limiting environmental factor was the occurrence of four consecutive dry months. Six classes of farming systems were determined based on the classification process. The classes were designated as A, B, C, D, E and F in order of decreasing level. About 12% of the rainfed lowland farmers practice Class A and majority (48%) was in Class C. In the case of the upland farmers, about 14% were in Class F (lowest level) and a majority (47%) was under Class D. The proposed farming system classification will provide a variety of data and information for researchers, extension workers and agricultural development planners in determining the potentials and limitations of existing farming systems. The classification can be a basis for designing and planning technological or developmental interventions in farming communities.
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Teruo HIGASHI, Wataru SUZUKI
Article type: Article
1996 Volume 40 Issue 1 Pages
11-25
Published: June 30, 1996
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Phytolith composition analysis in combination with the data on humus form analysed by Otsuka et al. (1988) made some following conclusions possible on the four volcanic ash soils in Luzon Island, the Philippines. 1) Surface soils developed under the prevailing grass vegatation at Tagaytay, Isarog and Iriga sampling site showed dark blackish color with humic acids of A-type, while soils at Caliraya site developed under predominant forest vegatation lacked for such an humic horizon and contained humic acids of B-type, although the age of the soil might be quite different. 2) Highly positive relationship was observed between carbon and phytolith contents for all the four soils excluding surface and near-surface horizons, that is coincided with the vegetational change detected in the composition of phytolith. 3) Newly proposed vegetational index awaits further examination as potentially valuable one for the estimation of vegetation change or disturbance caused by natural and anthoropogenic event.
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Teruo HIGASHI, Wataru SUZUKI
Article type: Article
1996 Volume 40 Issue 1 Pages
26-32
Published: June 30, 1996
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Seventeen samples from the leaves of Dipterocarpaceae belong to 7 families containing 16 species were analysed for the morphological composition of phytolith. The results showed that the composition of phytolith were characterized by the predominance of the each three phytolith types, Multifaceted, Sciereid, and Trqacheid phytolith, and their evenly mixed type, and also showed that this grouping of samples studied was roughly consistent with plant systematics at family level. Very little spherical phytolith, most of which could be derived from palm species, was observed in the present study.
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Ichiro YAMADA, Katsuo OKAMOTO, Toshiaki IMAGAWA, Michikazu FUKUHARA, K ...
Article type: Article
1996 Volume 40 Issue 1 Pages
33-40
Published: June 30, 1996
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Distribution of upland sediment (red or yellow soil named lacally Kunigani maji) over Ginoza coral reef was verified by analyzing the physical, chemical and mineralogical properties of the surface sediments and this result was compared with the Landsat TM data analysis by Okamoto et al. (1992). In most area of the reef crest side area where Landsat TM data showed no effect of upland sedimet, the particle size of almost all of the sediments was larger than 0.2mm, which were composed of the fragments of corals. The hue of all materials depositted in this area was close to 1Y and the total iron content was less than 0.2%. In the shore side where Landsat TM data showed obvious effect of upland sediments, the sand fraction composed of rock fragments was overwhelming. The hue of materials was 1OYR and the total iron content was more than 1%. The characteristics of sediments in the rear reef flat area were intermediate of former two areas. These results indicate that the compositions of the surface sediments deposited in Ginoza coral reef relate very well with upland sediment pollution estimated by Landsat TM data.
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Takeshi Ota, Pichai Wichaidit, Paiboon Pramojanee, Somsak Sukchan, Kaz ...
Article type: Article
1996 Volume 40 Issue 1 Pages
41-52
Published: June 30, 1996
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In Northeast Thailand, the soil degradation is very serious. The present study were performed to obtain data on the virgin-uncultivated soils and to clarify the process of their degradation by agricultural practices. Virgin soils were compared with cultivated soils in their neighborhood. Three pairs in Khon Kaen and two pairs in Roi Et were examined for morphological and chemical properties. The virgin soils compared with the cultivated soils had: (1) a much darker surface horizon, (2) a more developed structure of the surface horizon, (3) more and deeper roots, and (4) higher activities of soil organisms in the upper part. The surface horizons of the cultivated soils showed a marked decrease of organic matter, CEC, exchangeable bases and available phosphorus, and an increase of exchangeable acidity as compared with those of the virgin soils. These results suggest that soil fertility in the forests is maintained by internal cycling of mineral nutrients through the soil-plant continuum, and minimum erosion. To restore soil fertility of any cultivated soil to its original level, application of organic matter together with bases and protection the soil against erosion are confidently recommended.
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Y. Shirato
Article type: Article
1996 Volume 40 Issue 1 Pages
53-54
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H. Tsuduki
Article type: Article
1996 Volume 40 Issue 1 Pages
55-
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T. Ando
Article type: Article
1996 Volume 40 Issue 1 Pages
56-57
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[in Japanese]
Article type: Article
1996 Volume 40 Issue 1 Pages
58-
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
59-64
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
67-68
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
69-
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Appendix
1996 Volume 40 Issue 1 Pages
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Article type: Cover
1996 Volume 40 Issue 1 Pages
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Article type: Cover
1996 Volume 40 Issue 1 Pages
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