Photo credit: FREEPIK
Municipal sludge is a large source of nutrients. Unlike other organic fertilizers, municipal sludge has a stable composition, enabling precise adjustments to mineral fertilization. Nitrogen in organic fertilizer is available in different ways, and depending on which one is prevailing, products need to be managed in one or another way. For years, field trials with these products have been developed, leading to a better understanding of the nitrogen availability during years after application. The aim is to raise awareness among farmers about reducing mineral nitrogen fertilization when using municipal sludge.