Avaliação da acumulação dos elementos ca, fe, k, mg, na e zn na cama de frango durante a reutilização

Abstract

Day after day, there is a growing concern about the accumulation of trace elements in the bed of chicken added as a fertilizer in agricultural soils and its effects on soil, water underground and food chain. When added to the soil, these elements can compromise safe food production. In this study, the concentration of two trace elements [Fe and Zn] and four larger elements [Ca, Mg, Na and K], during four reuse cycles. Approximately 0.5g of ground sample was solubilized by the method of Adler and Wilcox and analyzed by FAAS (“Flame atomic absorption spectroscopy”) atomization with flame atomization) for Ca, Fe, Mg and Zn and flame photometry for Na and K. The accuracy of the results ranged from very good to good with the% RSD ranging from 0.0 to 14.40. the accumulation trends of the elements under study show good correlation and good suitability indexes to the data with the values ​​of determination coefficients varying from 0.701 to 0.958, and from these trends it is observed that cycle 3 is not statistically significant for trends. The availability of metals in poultry litter is best explained by two key factors: the power and ambient temperature. In this study it can be seen that with the reuse there was a significant increase (P <0.05) in the content of the elements Ca, Mg, Na, K and Zn and a decrease in Fe content during the 4 reuse cycles as shown in Table 24 and in Figures 13-19. This study showed that reuse favors soil fertility to the extent that contributes to the enrichment of Ca, Mg, Na, K and Zn in bed and decreased Fe. This increase presupposes a concern with some problematic elements for the soil such as Zn and Na which can create soil contamination if the litter is used as a fertilizer.