Abstract
AbstractA series of more than fifty field experiments carried out in south‐east Scotland showed superphosphate to be a more efficient phosphate fertilizer than any other with which it was compared. The apparent recovery of phosphorus by crops showed highly significant correlations with exchangeable calcium (positive), easily‐soluble soil phosphorus (negative), and summer rainfall (positive). The low (apparent) recovery of applied phosphorus in dry seasons appears to be due to the increased yield on the control plots, resulting from a higher availability of soil phosphorus. This may be caused by an increase in soil temperature in dry seasons. The optimum dressing of superphosphate for swedes on phosphate‐deficient soils was approximately 4.5 cwt. per acre.
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