Abstract
In 1970/1971 0·22 × 106 tonnes of P were used as fertilizer in Britain; the crops grown contained about as much. Phosphate fertilizers react with soil to form very insoluble products and P is not lost by leaching from soils with > 5 per cent clay. Water from land drains averages about 005 mg P l−1 or less from clay soils and 01·0·2 mg l−1 from sands. This is dissolved from phosphates naturally present in subsoils and rocks. Land drainage usually contains less P than the streams into which the drains flow. Long-term experiments show that phosphate fertilizers move very slowly down the profile.
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