Dilute acid-soluble phosphorus in fresh air-borne tephras and fixation with an increase in active aluminum and iron
Open Access
- 1 December 1997
- journal article
- research article
- Published by Taylor & Francis in Soil Science and Plant Nutrition
- Vol. 43 (4) , 839-848
- https://doi.org/10.1080/00380768.1997.10414650
Abstract
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 P2O5 kg-1 in 12 rhyolite-to-andesite tephras, and that determined by a modified Bray P2 extraction method (modified Bray P2) ranged between 133 and 812 mg P2O5 kg-1. In contrast, the Truog P-content in fresh basaltic andesite-to-basalt tephras was only 3.4–23 mg P2O5 kg-1, and the modified Bray P2-content was in the range of 41–185 mg P2O5 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°C 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.Keywords
This publication has 12 references indexed in Scilit:
- Phosphate Rocks for Direct Application to SoilsPublished by Elsevier ,2008
- The fate of phosphorus during pedogenesisPublished by Elsevier ,2003
- CHEMICAL KINETICS OF WEATHERING IN YOUNG ANDISOLS FROM NORTHEASTERN JAPAN USING SOIL AGE NORMALIZED TO 10°CSoil Science, 1993
- Sand-sized aggregates in Andosols and their role in P retentionGeoderma, 1992
- Agronomic Value of Unacidulated and Partially Acidulated Phosphate Rocks Indigenous to the TropicsPublished by Elsevier ,1986
- Crystallization of apatite in natural magmas under high pressure, hydrous conditions, with particular reference to ?Orogenic? rock seriesContributions to Mineralogy and Petrology, 1982
- The Use of Phosphate Rock for Direct Application to SoilsPublished by Elsevier ,1979
- DISTRIBUTION OF APATITE AND OTHER MINERAL INCLUSIONS IN A RHYOLITIC PUMICE ASH AND BEACH SANDS FROM NEW ZEALAND: AN ELECTRON-MICROPROBE STUDYEuropean Journal of Soil Science, 1970
- A modified single solution method for the determination of phosphate in natural watersAnalytica Chimica Acta, 1962
- The Determination of the Readily Available Phosphorus of Soils1Agronomy Journal, 1930