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    Phosphorus management on Irish dairy farms post controls introduced under the EU Nitrates Directive

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    Buckley et al 2016 - Tstor.pdf
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    Author
    Buckley, Cathal
    Wall, David
    Moran, Brian
    O'Neill, Stephen
    Murphy, Paul N. C.
    Keyword
    Phosphorus
    Farm gate balance
    Phosphorus use efficiency
    Random effects panel data model
    Environmental policy measures
    Dairy production systems
    Date
    08/11/2015
    
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    URI
    http://hdl.handle.net/11019/945
    Citation
    Cathal Buckley, David P. Wall, Brian Moran, Stephen O'Neill, Paul N.C. Murphy. Phosphorus management on Irish dairy farms post controls introduced under the EU Nitrates Directive. Agricultural Systems, 2016, 142, 1-8, DOI 10.1016/j.agsy.2015.10.007.
    Abstract
    The Republic of Ireland was one of a minority of EU member states to include direct controls on chemical phosphorus (P) fertilisers in its EU Nitrates Directive National Action Plan, first introduced in 2006. This study estimates farm gate phosphorus balances and use efficiencies across 150 specialist dairy farms over the seven year period since these controls were introduced (2006–2012) using nationally representative data. Results indicate that P balances declined by 50% over the study period from 11.9 in 2006 to 6.0 kg ha− 1 in 2012. This decline was driven by a reduction in chemical fertiliser imports of 6.5 kg ha− 1. This is equivalent to a reduction of 281 kg of P and represents a cost saving of €812 per annum across the average farm. Phosphorus use efficiency also improved over the period from 60% in 2006 to 78% in 2012, peaking in 2011 at 88.3%. This was achieved while increasing milk solids output per hectare and per cow. Results of a random effects panel data model indicated that P balance and use efficiency are significantly influenced by factors such as fertiliser prices, stocking rates, land use potential, use of milk recording technology, contact with extension services and rainfall patterns.
    Funder
    Department of Agriculture, Food and the Marine, Ireland
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1016/j.agsy.2015.10.007
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