ABSTRACT:Orthophosphate P was removed from municipal waste water, lake waters, and P‐spiked solutions by contact with fly ash from lignite burning electric power generating plants. The recovered ash was increased in total P content 3‐fold, and Bray No. 1 soluble P, 9‐fold. Phosphorus enriched ash so prepared was used in greenhouse trials with sand or soil as the major substrate material. Recovery of added P by barley plants ranged from 3 to 26 percent in the sand cultures and from 2 to 17 percent for soil cultures. Phosphorus contained in normal ash was partially available to barley under the conditions of these experiments. High B and the pozzolanic effect induced by ash reduced plant growth signific
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