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Farm-gate N and P balances and use efficiencies across specialist dairy farms in the Republic Ireland
Buckley, Cathal Murphy, Paul N. C. Wall, David
Buckley, Cathal
Murphy, Paul N. C.
Wall, David
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2013
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Buckley, C., Murphy, P. and Wall, David (2013).Farm-gate N and P balances and use efficiencies across specialist dairy farms in the Republic Ireland. REDP Working Paper Series 13-WP-RE-02
Abstract
This study establishes farm gate N and P balances and use efficiencies based on the
average of 2 years of Teagasc National Farm Survey data in 2009 and 2010. The
weighted average farm gate N surplus for this nationally representative sample of
specialist dairy farms was 143.4 kg N ha-1. Average farm gate nitrogen use efficiency
was 23.2%. For dairy farms operating under an EU Nitrates Derogation, the average
N surplus was higher at 181.8 kg N ha-1 and averageN use efficiency was slightly
lower at 22.2%. The total average farm gate P balance was 4.1 kg ha-1 in surplus, and
P use efficiency averaged 83.9%. P balance ranged from -7.3 to 23.0 kg ha-1. A total
of 27% had a negative P balance. The average P surplus for farms with a Nitrates
Derogation was below the average of all farms at 3.5 kg P ha-1 and average P use
efficiency for these Derogation farms was above the average of all farms at 90%.