Ton Groot Roessink, right, and his girlfriend Kim Stapelbroek are working to create liquid fertilizer from their manure which meets Dutch nutrient regulations.

Dutch farmer separates nitrogen from manure to fertilize crops

Process reduces manure hauling, produces usable heat and electricity for Dutch farm

Ton Groot Roessink milks about 200 cows near Baak, using robots, automated feeding and automated manure cleaning. Manure from the farm is put through a biogas digester. The methane is burned to produce electricity and heat for the farm.