Properties and Phosphate Fertilizer Function of Volcanic Ash Soil Type Adsorbent Adsorbing Phosphate from Secondary Effluent

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  • 都市下水二次処理水からのリンを吸着した火山灰土型リン吸着材の性質及びそのリン肥効
  • トシ ゲスイ 2ジ ショリスイ カラ ノ リン オ キュウチャク シタ カザンバイドガタ リン キュウチャクザイ ノ セイシツ オヨビ ソノ リンヒコウ

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Abstract

The total amount of phosphorus in a volcanic ash soil type adsorbent adsorbing phosphate from secondary effluent (used volcanic ash soil type phosphate adsorbent) is 13.8gP · kg-1, mainly consisting of aluminum combination type phosphorus, and the amount of citrate-soluble phosphorus is 57%. A though this used volcanic ash soil type phosphate adsorbent is not suitable as a phosphate fertilizer according to the Fertilizer Regulation Law, it is found suitable as a soil amendment matter with a phosphate supply function because of its high amount of citrate-soluble phosphorus. The soil physics of the subsoil of andosol seldom changes with the application of the used volcanic ash soil type phosphate adsorbent. However, this absorbent has a large effect of promoting the growth of Brassica campestris cv. Komatsu, and is more effective than superphosphate. Moreover, its phosphorus adsorption rate low at only 0.8%, which proves that it is very promising for soil reduction and recycling.

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