Sensitivity analysis and toxicological effects of sewage sludge application in seeds
DOI:
https://doi.org/10.6008/SPC2179-6858.2017.002.0011Keywords:
Phytoxicity, Reuse of Sludge in Agriculture, Sludge ToxicityAbstract
Sewage sludge is a waste generated at the end of the sewage treatment process and should be properly disposed. One possibility of disposal is use in agriculture, taking advantage of the nutrients and organic matter present. However, despite this nutritional potential the sludge may contain components that may cause toxicity to the soil. The aim of this study was to evaluate the sensitivity of seeds and different sludge application rates in cultivated soil. The experiments were carried out under cover at and soil was submitted to five treatments with dry sludge application, including mineral fertilize. For tests of toxicity were used seed to - lettuce (Lactuca sativa), cauliflower (Brassica oleracea) and arugula (Eruca sativa). Were performed three sampling campaigns and results indicate that higher doses of sludge can cause growth inhibition of roots. Among the plant species, the lettuce is more sensitive to treatment, compared to cauliflower and arugula with less root growth. Regarding to treatment, there was less root growth efficiency for dose recommended in resolution CONAMA 375/2006 added to the soil sludge; while greater efficiency was obtained with the dose of nitrogen recommended by the resolution.
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