1990 Fiscal Year Final Research Report Summary
Genesis and Classification of Kuroboku-Like Soils and their International Correlations
| Project/Area Number |
01560067
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
土壌・肥料
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| Research Institution | Hirosaki University |
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Principal Investigator |
OTOWA Michizo Hirosaki Univ., Faculty of Agr., Professor, 農学部, 教授 (40204226)
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| Co-Investigator(Kenkyū-buntansha) |
AOYAMA Masakazu Hirosaki Univ., Faculty of Agr., Instructor, 農学部, 助手 (60150950)
SAITO Hiroshi Hirosaki Univ., Faculty of Agr., Associate Professor, 農学部, 助教授 (50003520)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Kurobokudo / Andisols / Kuroboku-like soils / Andic subgroup / Bulk density / P absorption coefficient / P retention / Tohoku region |
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| Research Abstract |
Classification of Kurobokudo (black fluffy soils) in Japan has not been successfully elaborated yet. It derives from the vague concept of Kurobokudo themselves and the failure to recognize various intergrades to other soils. Assuming that Kuroboku-like soils are the Kurobokudo not qualified as Andisols (USDA, 1990), their characteristics and classification were studied in the Sea of Japan faced Tohoku region, northern Honshu, Japan.
Kuroboku-like soils are classified into three groups : 1. Soils that have horizon (s) meeting the requirement of andic soil properties, but not having enough thickness to be classified as Andisols. In other words, they are "thin Andisols" ; 2. Soils that have horizon (s) only meeting andic subgroup criteria ; 3. Soils not having any andic properties.
The percentage of Kuroboku-like soils in Kurobokudo of the region decreases with the order of Aomori, Akita and Yamagata, reflecting the variation in volcanic ash distribution. Characteristics of humus are not correlated with the above grouping.
Criteria usually used in Japan, bulk density of 0.90 g/cm3 and P absorption coefficient of 1,500, are able to recognize soils comparable to Andisols if the thickness requirement is the same, indicating that a widely acceptable classification having a clear-cut correlation with the Andisol classification may be possible.
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Research Products
(4 results)
