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- Title
Heavy metals in the soil and castor bean plants fertilized with sewage sludge stabilized by different processes.
- Authors
Lacerda Nascimento, Altina; Oliveira Durães, Maria Clara; Arruda Sampaio, Regynaldo; Zuba Junior, Geraldo Ribeiro; de Souza Prates, Fabiano Barbosa; Arnaldo Fernandes, Luiz; Zonta, Everaldo; Brasil do Amaral Sobrinho, Nelson Moura
- Abstract
This study evaluated the levels of heavy metals in the soil and castor bean plant after fertilization with sewage sludge (SS) subjected to different stabilization processes. The study was conducted in a Haplic Cambisol with the following treatments: control (CO), fertilization with solarized sewage sludge (SSS), composted sewage sludge (CSS), vermi composted sewage sludge (VSS), limed sewage sludge (LSS), and mineral fertilizer (MF). The experimental design included a subdivided plot scheme with fertilization being the primary factor and soil layers or leaf parts being the secondary factor. The data obtained were analyzed using analysis of variance and the Scott-Knott test with 5% significance. Fertilization with SSS, CSS, and LSS led to the highest increase in Zn in the soil, mainly in the surface layer. In the leaf tissues, Zn and Cu levels were higher with the CO and SSS treatments, whereas the Ni level was higher with SSS, CSS, VSS, and MF treatments. In general, Zn and Cu levels were higher in the leaf limb than in the petiole, whereas Ni, Pb, and Cr levels were higher in the petiole than in the leaf limb. In any case, no symptoms of toxicity in the plants and no risk of soil contamination were observed with any of the fertilization treatments.
- Subjects
SEWAGE sludge; CASTOR beans; CASTOR oil plant; PLANT fertilization; WASTE management; SLUDGE composting; SOILS
- Publication
Ciência Rural, 2023, Vol 53, Issue 12, p1
- ISSN
0103-8478
- Publication type
Article
- DOI
10.1590/0103-8478cr20210246