Lodo de esgoto e adubação mineral na recuperação de atributos químicos de solo degradado

Abstract

Objetivou-se, neste trabalho, estudar a influência do lodo de esgoto e adubação mineral na recuperação de atributos químicos de um Latossolo Vermelho degradado, cultivado há quatro anos, com eucalipto e braquiária. O delineamento experimental utilizado foi inteiramente casualizado com seis tratamentos e quatro repetições. Os tratamentos foram: T: testemunha (solo cultivado com eucalipto e braquiária sem uso do lodo de esgoto e adubação mineral); AM: solo cultivado com eucalipto e braquiária com adubação mineral; D30: solo cultivado com eucalipto e braquiária com 30 Mg ha-1 de lodo de esgoto; D60: solo cultivado com eucalipto e braquiária com 60 Mg ha-1 de lodo de esgoto e duas áreas foram utilizadas como testemunhas: VN: vegetação nativa do cerrado e SE: solo exposto. Foram avaliados os atributos químicos do solo: fósforo, potássio, cálcio, magnésio, matéria orgânica; acidez potencial, pH, soma de bases, capacidade de troca catiônica e saturação por bases, em quatro camadas do solo: 0-0,05; 0,05-0,10; 0,10-0,20 e 0,20-0,40 m. Os resultados indicaram que ocorreram efeitos positivos do lodo de esgoto quanto à recuperação dos atributos químicos do solo.

Characterization of sewage sludge generated in Rio de Janeiro, Brazil, and perspectives for agricultural recycling

“…Carvalho et al (2015), when analyzing the organic fraction of five different sludge, found that more than 70% of carbon and 80% of nitrogen are in the organic compartment of sewage sludge. For this reason, sludge has been widely used as an amendment to improve soil chemical and physical characteristics and its application to soil has been indicated as one of the actions to mitigate climate change aiming at increasing the organic matter stock and hence soil carbon (BONINI et al, 2015;OUIMET et al, 2015).…”

Soil chemical attributes and initial growth of corn crop by adding domestic and industrial sewage sludge

“…These results are supported by the chemical characterisation of sewage sludge that altered the initial chemical characteristics of the soil. Moreover, as a result of the elevation of soil pH, there is an increase in the capacity to provide nutrients to the plants ( BOECHAT et al, 2015), and assistance in structuring the soil (BONINI et al, 2015) (Table 2). *-Significant effect at the 1% level of probability by F-test; **-Significant effect at the 5% level of probability by F-test; ns -not significant effect by F-test.…”

“…The use of sewage sludge in agriculture is still very questionable, due to the damage it can cause to human health and the natural environment, besides financial losses if it is incorrectly used (BONINI et al, 2015). A feasible technical alternative to the reuse of organic wastes is their use as organic fertilizer, provided that no heavy metals, pathogens and toxic components are present.…”

“…Basically, the sewage sludge contains potassium, phosphorus, organic matter, nitrogen, macro and micronutrients (BONINI et al, 2015;BOECHAT et al, 2014a). Over the years, the chemical, biological and physical properties of soil in traditional cropping systems have been declining.…”

“…These include compaction (CAMPOS; , water infiltration capacity into soil (ALVES et al, 2007), microorganism activity (BOECHAT et al, 2012), edaphic fauna enrichment (KITAMURA et al, 2008), chemical soil improvements (BONINI et al, 2015;KITAMURA et al, 2008), and still increasing crop productivity (CALDEIRA et al, 2014;SHABANI, 2011). Moreover, there is a huge need for continuous research about the disposal and reuse of sewage sludge produced by wastewater treatment plants (WWTP) and investiments and commitment of the government and society are needed to seek alternatives for the disposal of this waste.…”