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Ciência Florestal

Print version ISSN 0103-9954On-line version ISSN 1980-5098


SIQUEIRA, David Pessanha et al. Sewage sludge treated in the substrate composition for Plathymenia reticulata Benth seedling production. Ciênc. Florest. [online]. 2019, vol.29, n.2, pp.728-739.  Epub Sep 30, 2019. ISSN 0103-9954.

The aim of this work was to evaluate the treated sewage sludge (LET) associated with commercial substrate based on pinus bark (SC1) or based on coconut fiber (SC2), in different proportions, as substrate for the production of vinhático seedlings. The study was led in a greenhouse, located in the research support unit of the State University of North Fluminense. The treatments considered as substrates were 20, 40, 60, 80% of LET associated with SC1 or SC2, 100% of LET and the treatment with SC1 with conventional fertilization (control). The sewage sludge was sanitized with addition of lime to 15% of dry weight. The results showed that the lower LET proportions in the substrate resulted in seedlings with better growth in height, stem diameter, leaf area, dry mass of shoot and root system, root length and volume. The nodulation was negatively influenced in the seedlings produced in proportions above 20% LET. The aggregation of the clod was not influenced by the addition of LET, however, there was increase of the curvature of the clod in the seedlings produced in larger amounts of LET. The shoot content of N, P and K was lower in the seedlings with LET. For the production of vinatic seedlings, 20% of sewage sludge associated with SC1 or SC2, is suggested, with no losses in relation to the seedlings produced in commercial substrate that received fertilization, used commercially.

Keywords : Vinhático; Alternative substrates; Biossolid; Clod quality.

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