Characteristics and classification of kuroboku-like soils
1995
Otowa, M. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture) | Taneichi, J. | Mochizuki, T.
The designation of Kuroboku or Kurobokudo, black fluffy soils, has been widely used by soil scientists as well as by laymen in Japan. If their definition as used in soil science is ambiguous, communication among soil scientists will be inadequate. Unfortunately, this is the case. It seems, therefore, urgent to scrutinize the concept and definition of Kurobokudo, not only to improve the soil classification system currently used, but also to provide agronomists and other persons engaged in soil management and amelioration with precise information. If the definition of Kurobokudo in soil management and amelioration with precise information. If the definition of Kurobokudo is revised, it is probable that a significant part of Kurobokudo will be excluded and constitute intergrades to various soils. The intergrades will be referred to as Koroboku-like soils in this paper. While the Tohoku region, the northernmost part of Honshu, is well known as having a wide acreage of Kurobokudo, the Kurobokudo of the Japan Sea coast generally has different properties from those of the Pacific coast. The reason can be attributed to the extent and thickness of volcanic ash parent materials. As volcanic ash derived from major volcanoes located in the central mountain ridges has been mainly deposited on the Pacific coast due to westerly winds, soils on the Japan sea coast are relatively less influenced by volcanic ash parent materials. Therefore, the Kurobokudo of the Japan Sea coast seems to be more appropriate for the study of Koroboku-like soils
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