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Balance sheet for phosphorus in the UK.

J C Bowman

    Ciba Foundation Symposium
    |September 13, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The UK imports significant phosphorus, primarily as fertilizer. Soil accumulates excess phosphorus annually, highlighting the need for strategies to prevent its immobilization.

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    Area of Science:

    • Environmental Science
    • Agricultural Science
    • Resource Management

    Background:

    • Phosphorus is a critical nutrient for agriculture and human life.
    • The UK economy relies on imported phosphorus, primarily for fertilizer.
    • Understanding phosphorus flows is essential for sustainable resource management.

    Purpose of the Study:

    • To quantify the inputs, uses, and outputs of phosphorus in the UK economy.
    • To identify major sources of phosphorus import and export.
    • To explain the annual discrepancy in the phosphorus balance.

    Main Methods:

    • Compilation of a balance sheet for phosphorus.
    • Quantification of phosphorus imports (fertilizers, animal feeds, detergents, food).
    • Quantification of phosphorus outputs (sewage, animal excreta, refuse, soil losses).

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    Main Results:

    • Major phosphorus import is fertilizer (approx. 200 kt P/yr).
    • Significant outputs include sewage (50 kt P), animal excreta (26 kt P), and refuse (21 kt P).
    • Annual soil phosphorus accumulation is approximately 210 kt P, explaining the balance discrepancy.

    Conclusions:

    • The UK exhibits a substantial annual increase in soil phosphorus levels.
    • This accumulation is linked to the high input of fertilizer phosphorus.
    • Research into preventing or reversing phosphorus immobilization in soil is recommended due to UK's import dependence.