Farm structure or farm management: effective ways to reduce nutrient surpluses on dairy farms and their financial impacts

Abstract To control and prevent nutrient pollution from agricultural non-point sources, the Dutch government introduced the Mineral Accounting System (MINAS), a nutrient bookkeeping system which taxes farms with nutrient surpluses exceeding safe threshold values. Since the levies can be severe it is imperative to know what causes high nutrient surpluses. The large variation in surpluses is usually attributed to management factors like grazing, feeding and fertilising. Reducing surpluses is therefore assumed to be most effective through an improvement of management. Using technical and nutrient bookkeeping data of specialised dairy farms over 3 years (1997–1999) the effect of farm structure and farm management on nutrient surpluses is analysed with a partitioned linear regression model. Furthermore, the financial impacts are studied. The ratio between structure and management for the explanation of the nitrogen surplus was 1:3, and for phosphate 1:4 over the period 1997–1999. These ratios show that in current practices management is far more important than structure. Changing farm management rather than farm structure can therefore reduce nutrient surpluses more effectively, making it a more interesting approach for policy makers. Furthermore, improving management will also improve financial results.

[1]  S. Carpenter,et al.  NONPOINT POLLUTION OF SURFACE WATERS WITH PHOSPHORUS AND NITROGEN , 1998 .

[2]  S. C. Jarvis,et al.  Nutrient management legislation in European countries , 2001 .

[3]  I. D. Boer,et al.  Nutrient balances of livestock production systems in The Netherlands. , 1996 .

[4]  H. G. van der Meer,et al.  Reduction of nutrient emissions from ruminant livestock farms , 1995 .

[5]  H. P. Smit,et al.  Mineral accounting: the way to combat eutrophication and to achieve the drinking water objective , 1998 .

[6]  Denzil G. Fiebig,et al.  The frisch-waugh theorem and generalized least squares , 1996 .

[7]  J. Neeteson.  Nitrogen and phosphorus management on Dutch dairy farms: legislation and strategies employed to meet the regulations , 2000, Biology and Fertility of Soils.

[8]  G.W.J. Giesen,et al.  Economic and environmental consequences of different governmental policies to reduce N-losses on dairy farms. , 1994 .

[9]  H. Keulen,et al.  Dairy farming in the Netherlands in transition towards more efficient nutrient use , 1999 .

[10]  C.W.J. Roest,et al.  Leaching of nitrate from agriculture to groundwater: the effect of policies and measures in the Netherlands , 1998 .

[11]  R. Frisch,et al.  Partial Time Regressions as Compared with Individual Trends , 1933 .

[12]  Ruud B.M. Huirne,et al.  The Dutch Mineral Accounting System and the European Nitrate Directive: implications for N and P management and farm performance , 2002 .

[13]  Efficient resource management in dairy farming on sandy soil , 1999 .

[14]  H. van Keulen,et al.  Dairy farming systems based on efficient nutrient management , 1992 .

[15]  Ruud B.M. Huirne,et al.  Relationships between technical, economic and environmental results on dairy farms: an explanatory study , 1997 .

[16]  R. Huirne,et al.  Environmental impact of heifer management decisions on Dutch dairy farms , 2000 .