Dilute Acid-Soluble Phosphorus in Fresh Air-Borne Tephras and Fixation with an Increase in Active Aluminum and Iron

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概要

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• Fresh rhyolite-to-andesite tephras ground to less than 0.15 mm particles contained dilute acid-soluble phosphorus (P) as in the case of cultivated upland soils in Japan. The amount of P determined by Truog extraction (Truog P) ranged between 119 and 784 mg P_2O_5 kg^<-1> in 12 rhyolite-to-andesite tephras, and that determined by a modified Bray P_2 extraction method (modified Bray P_2) ranged between 133 and 812 mg P_2O_5 kg^<-1>. In contrast, the Truog P-content in fresh basaltic andesite-to-basalt tephras was only 3.4-23mg P_2O_5 kg^<-1>, and the modified Bray P_2-content was in the range of 41-185 mg P_2O_5 kg^<-1>, although the total P-content of the two tephra groups was in almost the same range. Among 12 rhyolite-to-andesite tephras, those from Mt. Usu that erupted in 1977 and from Mt. Pinatubo that erupted in 1991 were selected for detailed studies. Fine particle size fractions of these tephras .showed higher Truog P values than the coarse ones. The Truog P values further increased in the heavy fraction with a particle density of 2.8 or greater. In this heavy fraction, apatite was detected by energy dispersive X-ray (EDX) analysis, indicating the contribution of the mineral to the high Truog P. Dilute sulfuric acid treatment of the tephras at 80℃ for 15 d followed by neutralization increased the amount of active Al and Fe and decreased the Truog P values of these tephras. These results suggested that the amount of apatite rapidly decreased with weathering in volcanic ash soils.

• 社団法人日本土壌肥料学会の論文

著者

• Nanzyo Masami

  Faculty of Agriculture, Tohoku University

• Sato Atsushi

  Faculty of Biore source Sciences, Akita Prefectural University

• Yamada I

  Kyushu National Agricultural Experiment Station

• Takahashi Tomoko

  Faculty of Agriculture, Tohoku University

• Shoji Sadao

  Faculty of Agriculture, Tohoku University

• Yamada Ichiro

  Kyushu National Agricultural Experiment Station

• Shoji Sadao

  Faculty Of Agriculture Tohoku University

• Nanzyo Masami

  Faculty Of Agriculture Tohoku University

• Takahashi Tomoko

  Faculty Of Agriculture The University Of Tokyo:(present Office)mitsui-shin Information System Co. Lt

• Takahashi Tomoko

  Faculty Of Agriculture Tohoku University

• Takahashi Tomoko

  Faculty Of Agriculture Okayama University:(present Address)central Research Laboratory Dainihon Joch

• Sato Atsushi

  Faculty Of Agriculture Tohoku University

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