An Approach to Nutrient Management on Dairy Farms

摘要

In the European Union, Groundwater should con- tain less than 50 mg of nitrate/L. Individual countries have developed alternative strategies for phosphorus (P). In The Netherlands, regulations based on P limited the amount of manure applied per hectare. A more balanced P supply to the land has been achieved by transport of manure from surplus to deficit regions. Costs of processing of manure to pellets ap- peared to be (too) high. In animal production experi- ments, lowering the P content of concentrates and mineral supplements reduced P losses without an adverse effect on production.