Resumo

PRIMO, Dário C. et al. Evaluation of the nutritional quality of organic compost produced with tobacco residues. Rev. bras. eng. agríc. ambient. [online]. 2010, vol.14, n.7, pp. 742-746. ISSN 1807-1929.  http://dx.doi.org/10.1590/S1415-43662010000700009.

The use of agroindustrial waste to produce organic compost can result in greater sustainability for agricultural systems. This study aimed to analyze the final quality of the organic compost, according to their nutrients and the presence of active toxic substances. The combinations of ground tobacco stem, bovine manure and rumen (TF+EB+RB), tobacco stem, cattle manure and Microsept Dust (TF+EB+MP) and tobacco stem and cattle manure (TF+EB) were evaluated. Mean samples of each compost were analyzed to determine the concentration of micro and macro nutrients at 60 and 120 days and to verify the nicotine concentration and the presence or absence of pesticide residues in the raw material (TF) and in the composts obtained at 120 days. The data obtained showed high concentrations of potassium (K), nitrogen (N), chloride (Cl) and iron (Fe) in the final compost compared to the other micro and macro nutrients. Neither pesticides in the raw material (TF), nor presence of nicotine in the mean samples obtained within 120 days was detected, demonstrating the absence of environmental impact risks in the agricultural use of these composts. At the end of the composting process, the mixture TF+EB was the one which resulted in an organic compost with the highest concentration in micro and macro nutrients.

Palavras-chave : chemical analysis; nutritional potential; Nicotiana tabacum L.