Resumo

YOSSA, Martha; HERNANDEZ-AREVALO, Gilma  e  VASQUEZ-TORRES, Walter. Nutritional composition of the sediment in ponds with red tilapia. Orinoquia [online]. 2012, vol.16, suppl.1, pp.217-224. ISSN 0121-3709.

Organic matter (OM), pH, available phosphorus, macro and micronutrients were analyzed in surface sediments of commercial ponds of red tilapia for two cycles. In eight of the fourteen nutrients no significant difference (P>0.05) between cycles, however, did increase in the OM, Ca, Mg, K and Mn, but decrease in Al, Cu and B in the second cycle. Although the pH increased, there was no significant difference (P> 0.05), in that the concentrations of available P, Na, Fe and Zn increased, with highly significant difference (P <0.01).There was also highly significant positive correlations (P<0.01) of Fe wiht Zn, and OM and P with Ca, Fe and Zn. Despite the constant supply of additives in this farm to maintain a system of green water, the OM was greater than 3% which reflected a proper process of mineralization, also the values of macro and micro nutrients incorwere generally stable. This balance in the system could be enhanced by the uses of aerators, efficient biological activity of probitic and bioturbation action of tilapia.

Palavras-chave : organic matter; pH; macronutrients; micronutrients; orinoquia.

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