Effect of Lime on the Availability of Phosphorus in Soils of High to Low Sesquioxide Content
1954
Robertson, W. K. | Neller, J. R. | Bartlett, F. D.
The effect of rates of lime and phosphorus were tested on three virgin and three cropped Florida soils over a wide range of sesquioxide and phosphorus contents. The experiment was set up in the greenhouse. Lime was applied to get a wide range of pH levels. Oat and corn yield data and the percent recovery of applied phosphorus tagged with P³² were the criterion of response. Liming soils relatively low in residual phosphorus increased the availability of applied phosphorus up to pH 6 to 6.5 when the sesquioxides were high but had no effect where the sesquioxides were low. Liming these soils above 6 to 6.5 caused the percentage of phosphorus in the plant from the fertilizer to level off or decline, probably due to the formation of relatively unavailable tricalcium phosphate. Liming soils high in residual phosphorus reduced the availability of fertilizer phosphate regardless of the sesquioxide content. Uptake of phosphorus from currently applied superphosphate was highest from the soils high in sesquioxide content irrespective of rate of liming.
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