De maat van mest: Perspectief van mestbewerking op de boerderij voor akkerbouwers en melkveehouders

This report focusses on the question: is it useful to process the surplus of cattle slurry on a dairy farm, or is it better to export non-processed slurry directly to arable farmers? The economic value of ten different manure products has been evaluated from the perspective of a dairy farmer who delivers it and the arable farmer who receives it. The revenues concern fertiliser savings (nitrogen, phosphorus, potassium) and organic matter supply for improving the soil fertility / quality. The costs involve costs of different housing system, (mechanical) separation, sampling & analysing, transport and application on the field. The results show that with regard to fertiliser savings and costs in many cases processing cattle slurry is not profitable. When organic matter is also included in the financial profits the solid fraction of mechanical separation is also an attractive product. Farmyard manure (straw manure) can also be favourable for arable farmers but production costs are high due to high costs for straw.