Physicochemical Properties of the Soils Associated with Shifting Cultivation in Northern Thailand with Special Reference to Factors Determining Soil Fertility

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概要

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• Recently agricultural activity in the mountainous area of northern Thailand has increased and problems relating to soil fertility have arisen. In order to gain basic information about the soil properties associated with shifting cultivation, physieoehemieal properties of the surface soils (0-10 cm) and subsoils (30-40 cm) were investigated in selected villages in the area. The physieochemical properties of the soils studied are summarized as follows: 1) The soils were rich in organic matter, content of which ranged from 11.4 to 63.3 g C kg-^<-1> in the surface soil. 2) The pH(H_2O) of the soils mostly ranged from 5 to 7 and soil acidity was more pronounced in the deeper horizons. In the surface soils, exchangeable Ca and Mg were generally dominant, whereas exchangeable Al was often predominant in the subsoils. 3) Most of the soils showed a medium to fine texture with more than 30% clay. The clay mineral composition was characterized by various degrees of mixture of kaolin minerals and clay mica with, in some cases, a certain amount of 2:1-2:1: i intergrades. 4) According to the ion adsorption curves, most of the B horizon soils were characterized by the predominance of permanent negative charges. On the other hand, organic matter contributed to the increase of variable negative charges in the surface soils. The content of organic matter and the percentage of the clay fraction were essential for determining the CEC of the soils of the surface 10 and 30-40 cm depths, respectively. Under the field conditions, the composition of exchangeable cations largely reflected the soil acidity. In addition, the content of organic matter also showed a significant correlation with that of available N in the surface soils. Thus, soil acidity both in the surface soils and subsoils, organic matter content in the surface soils, and clay content in the subsoils were considered to be the main factors that affected soil chemical fertility in the area.

• 社団法人日本土壌肥料学会の論文

著者

• Tanaka Sota

  Kochi Univ. Kochi Jpn

• Tanaka S

  Graduate School Of Kuroshio Science Kochi University

• Tanaka S

  Faculty Of Agriculture Kochi University

• Tanaka Sota

  Faculty of Agriculture, Kochi University

• Funakawa Shinya

  Faculty of Agriculture, Kyoto University

• Kaewkhongkha Thammanoon

  Department of Agriculture

• Yonebayashi Koyo

  Faculty of Agriculture, Kyoto Prefectural Unirersity

• Hattori Tomoo

  Faculty of Agriculture, Kyoto Prefectural University

• Funakawa Shinya

  Kyoto Univ. Kyoto Jpn

• Hattori Tomoo

  Faculty Of Agriculture Kyoto Prefectural University

• Hattori T

  Faculty Of Agriculture Kyoto Prefectural University

• Funakawa Shinya

  Faculty Of Agriculture Kyoto Prefectural University

• Yonebayashi K

  Kyoto Prefectural Univ. Kyoto Jpn

• Yonebayashi Koyo

  Faculty Of Agriculture Kyoto Prefectural University

• Tanaka Sota

  Faculty Of Agriculture Kochi University

• Yonebayashi Koyo

  Agriculture Kyoto Prefectural University

• Funakawa S

  Graduate School Of Agriculture Kyoto University

• Yonebayashi K

  Faculty Of Agriculture Kyoto Prefectural University

• Funakawa Shinya

  Graduate School Of Global Environmental Studies Kyoto University:graduate School Of Agriculture Kyot

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