Chemical and microbiological attributes of an oxisol treated with successive applications of sewage sludge¹

Revista Brasileira de Ciência do Solo

José Rafael Pires Bueno¹  Ronaldo Severiano Berton¹  Adriana Parada Dias Da Silveira¹  Marcio Koiti Chiba¹  Cristiano Alberto De Andrade¹  Isabella Clerici De Maria¹ 

关键词: municipal waste;    organic matter;    soil microbes;    maize;    resíduos urbanos;    matéria orgânica;    microbiota do solo;    milho;   

DOI  :  10.1590/S0100-06832011000400040

来源: SciELO

【 摘 要 】

Studies on sewage sludge (SS) have confirmed the possibilities of using this waste as fertilizer and/or soil conditioner in crop production areas. Despite restrictions with regard to the levels of potentially toxic elements (PTE) and pathogens, it is believed that properly treated SS with low PTE levels, applied to soil at adequate rates, may improve the soil chemical and microbiological properties. This study consisted of a long-term field experiment conducted on a Typic Haplorthox (eutroferric Red Latosol) treated with SS for seven successive years for maize production, to evaluate changes in the soil chemical and microbiological properties. The treatments consisted of two SS rates (single and double dose of the crop N requirement) and a mineral fertilizer treatment. Soil was sampled in the 0-0.20 m layer and analyzed for chemical properties (organic C, pH, P, K, Ca, Mg, CEC, B, Cu, Fe, Mn, Zn, Cd, Ni, and Pb) and microbiological properties (basal respiration, microbial biomass activity, microbial biomass C, metabolic quotient, microbial quotient, and protease and dehydrogenase enzyme activities). Successive SS applications to soil increased the macro- and micronutrient availability, but the highest SS dose reduced the soil pH significantly, indicating a need for periodic corrections. The SS treatments also affected soil microbial activity and biomass negatively. There were no significant differences among treatments for maize grain yield. After seven annual applications of the recommended sludge rate, the heavy metal levels in the soil had not reached toxic levels.

【 授权许可】

CC BY   
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