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A 3 year (2009–2011) study found a mean N balance of 166 kg N/ha, P balance of 4.93 kg P/ha, N use efficiency of 0.24, P use efficiency of 0.71, and net profit of €598/ha on 19 Irish dairy farms. The increase in mean net profit with mean milk receipts and the decrease with mean expenditure on chemical fertilisers imply that increasing milk receipts while optimising the use of chemical fertiliser input...
This study compared the profitabilities of systems of dairy production based on N‐fertilized grass (FN) and grass‐white clover (WC) grassland and assessed sensitivity to changing fertilizer N and milk prices. Data were sourced from three system‐scale studies conducted in Ireland between 2001 and 2009. Ten FN stocked between 2·0 and 2·5 livestock units (LU) ha−1 with fertilizer N input between 173...
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