ZPCを用いたカンキツ栽培圃場の土壌肥沃度解析

概要

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Soil fertility of the orange orchards in the greenhouse and the open field in Kagami-cho, Kami-gun, Kochi were evaluated in terms of soil profile description, soil physical properties, fertility, oxide content, clay minerology, and charge properties. Especially, ZPC and σ_p could be considered as effective measures of soil fertility status. The following results were obtained : 1)The dominance of a permanent negative charge is supposed to be more effective to shift the zero point of charge(ZPC) toward lower pH values than the presence of organic matter. 2)The coexistence of exchangeable Ca applied as fertilizer or originated from the colluvial parent material caused the soil ZPC to occur at a higher pH value. Al-intergrade minerals(hydroxy-interlayered vermiculite, HIV)predominated among the clay minerals followed by kaolins. Kaolins might be a strongly weathering product in the past and HIV has been formed as a current product through the reaction of Al with illite, which is one of the dominant clay minerals in the materials derived from the Shimanto formation. This HIV was the major source of permanent negative charge, and is supposed to be a determinant factor of soil ZPC.
社団法人日本土壌肥料学会の論文
1996-02-05