Sentence examples for n surpluses from inspiring English sources

In North Atlantic Europe intensive dairy farms have a low nitrogen (N) use efficiency, with high N surpluses often negatively affecting water quality.

Since 1993 the farm has succeeded in realising low N surpluses (1997: 76 kg N ha−1) and low nitrate concentrations (1993 1999 mean: 55 mg l−1).

Substantial reductions in N surpluses were achieved for both treatments TN and GC compared with treatment CN (N surpluses ha−1: 254, 168 and 119 kg at Site 1, and 247 kg, 190 and 73 kg at Site 2, for CN, TN and GC, respectively).

The amount of digestate for a reasonable fertilization strongly depends on the N surpluses and the straw management of the pre-crop.

It was concluded that the combinations of mitigation options used were successful in reducing N surpluses compared with the conventional N management system, but animal and herbage production was reduced.

Such a system approach allows identifying the causes of varying N surplus and N utilisation.

In 1997, the mean N surplus on dairy farms in the Netherlands was 324 kg N ha−1.

Higher plant densities promoted shoot N uptake and reduced soil mineral N residues and apparent N surplus in root zone.

A clear relation was found between N management, as expressed by the N surplus, and nitrate concentration in the groundwater.

This would minimize N surplus in areas of lower productivity and to improve the sustainability of N management overall.

So compared with a 'current average' farm in the middle of the 1990s with the same milk production level (N surplus of 408 kg ha−1), a reduction of 62% in N surplus was realized.