The potential of sewage sludge as a substrate component for seedlings of forest species

Among the various existing forms of final disposal of sewage sludge, a recycling forest is one of the most promising, for this is a waste that comes from the source of organic material (MO) and essential nutrients for plants, among them, or nitrogen (N), phosphorus (P) and potassium (K). Therefore, the objective was to study the potential of sewage sludge as a substrate component for seedlings of forest species, when considering the physicochemical and microbiological properties of the sludge produced by a Sewage treatment station (ETE) in the municipality of Paragominas - PA. The applied method was deductive, with a quantitative and qualitative approach, associated with the collection of documentary data in scientific journals indexed between 2010 to 2020, to select more current literature. As for the sampling plan of the studied sludge, it involved the steps established by ABNT (2004). Data analysis made it possible to infer that: 1) the analyzed mud contains high levels of OM (x = 86.55%), Ntotal (x = 2.02%), P (x = 5.70%), C org (x = 24.29%), in addition to presenting microbiological standards as set out in CONAMA Resolution 375 of 2006; 2) has the potential to influence the proper initial development of forest seedlings, concerning aspects, such as the Height/Bandstand Diameter (H/DC) ratio and Dry Mass of Aerial Part (MSPA). These can also contribute to a useful Dickson Quality Index (IQD). Therefore, the composition of substrates formulated with the studied sewage sludge can assist in the initial development of forest seedlings and, consequently, in their survival in the field phase.