NDLI: Farm gate level nitrogen balance and use efficiency changes post implementation of the EU Nitrates Directive

Content Provider	Springer Nature Link
Author	Buckley, Cathal Wall, David P. Moran, Brian O’Neill, Stephen Murphy, Paul N. C.
Copyright Year	2015
Abstract	Farm gate nitrogen (N) balance and use efficiency was estimated across 150 specialist Irish dairy farms over a 7 year period between 2006 and 2012 using nationally representative data. The study period coincided with the introduction of EU Nitrates Directive regulations aimed at minimising losses of N to the aquatic environment and results indicated that N balance declined by 25.1 kg ha−1 from 180.4 to 155.3 kg ha−1 over the study period. This decline can almost entirely be attributed to reduced chemical N fertiliser inputs of 23.1 kg ha−1 over the period, equivalent to 1247 kg N, or a cost saving of €1347 per annum across the average dairy farm. Nitrogen use efficiency also increased by 2.1 % points over the period from 20.8 to 22.9 %. This was achieved while increasing milk solids output from 405.3 to 449.6 kg ha−1 in the context of a declining stocking rate (1.86–1.84 livestock units ha−1). These results suggest some positive impact of the regulations on N management on Irish dairy farms at the nutrient source end of the nutrient transfer continuum. This increased N management efficiency has a potential double dividend effect of increased returns to agricultural production while reducing the risk of N transfer to the aquatic environment. In addition to the introduction of the regulations, results of a random effects panel data model indicated that N balance and use efficiency are significantly influenced by factors such as fertiliser prices, stocking rates, land use potential, contact with extension services and climatic variables.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	104
Issue Number	1
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-11-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrogen Farm gate balance Nitrogen use efficiency Random effects panel data model Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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