Environment Agency and the use of sludge: PLENARY KEYNOTE PRESENTATION
Mat Davis, Environment Agency, UK
(Free)
What are organic manures: fertiliser derived from one or more animal, plant or human sources
An example to help understand the value of biosolids applications:
20 tonnes per hectare (t/ha) digested sludge cake (biosolids) applied in autumn before oilseed rape supplies 220 kg/ha total nitrogen and 33 kg/ha of crop available nitrogen. The biosolids further supply 220 kg/ha phosphate and 12 kg/ha potash. This application of biosolids saves up to £159/ha on manufactured fertiliser costs.