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  • Cited by 6
  • Print publication year: 2011
  • Online publication date: May 2011

10 - Nitrogen flows in farming systems across Europe

from Part III - Nitrogen flows and fate at multiple spatial scales

Summary

Executive summary

Nature of the problem

Farms represent operational units which determine N-use efficiency and incorporation into products and, collectively, at the wider scale, determine the extent of environmental losses from agriculture.

The basic principles and objectives of using N, from whatever source, pertain to different systems across the wide range of farming types across Europe.

In addition to managing external inputs (fertilisers), there is much opportunity to improve N transfers within the farm. Mineral fertilisers are added to balance supply/demand for crops. Some systems rely on legume-N which, once incorporated into farm cycles, behaves in the same way as other N forms.

Approaches

Farm N cycles, their constituent parts and controlling influences are described and generalised principles identified.

Farm budgets for a range of systems, focussing on typical practice in NW Europe are shown which illustrate some general, important differences between farming systems.

Key findings/state of knowledge

Benefits of using N effectively are far reaching with immediate impact in promoting production. Use of N also provides an effective and flexible management tool for farmers.

Crop N requirements are determined from response curves and economic optima. Advice is supplied to farmers from various sources but the extent to which it is taken depends on many factors. New technologies are available to improve N-use efficiency. The basis of good N management is to optimise efficiency of added and soil N by increasing the temporal and spatial coincidence between availability and uptake of N.

[…]

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