34 research outputs found
Qualidade de um sistema latossolo-argissolo como receptor de efluentes no município de Lins(SP)
Frações de fósforo acumuladas em Latossolo argiloso pela aplicação de fosfato no sistema plantio direto
Influência da altura de pastejo de azevém e aveia em atributos físicos de um Latossolo Vermelho distroférrico, após sete anos sob integração lavoura-pecuária
Qualidade do solo em sistemas de manejo avaliada pela dinâmica da matéria orgânica e atributos relacionados
Estudo comparativo entre citopatologia e histopatologia no diagnóstico de neoplasias caninas
Soil Quality Morphological Index in Relation to Organic Carbon Content of Soils in Southeastern Nigeria
Evaluating a bioremediation tool for atrazine contaminated soils in open soil microcosms: The effectiveness of bioaugmentation and biostimulation approaches
A previously developed potential cleanup tool for atrazine contaminated soils was evaluated
in larger open soil microcosms for optimization
under more realistic conditions, using a natural
crop soil spiked with an atrazine commercial formulation (Atrazerba FL). The doses used were 20£ or 200£ higher than the recommended dose (RD) for an agricultural
application, mimicking over-use or spill situations. Pseudomonas sp. strain ADP was used for bioaugmentation (around 107 or 108 viable cells g¡1 of soil) and citrate for biostimulation (up to 4.8 mg g¡1 of soil). Bioremediation treatments providing fastest
and higher atrazine biodegradation proved to differ according to the initial level of soil ontamination. For 20£ RD of Atrazerba FL, a unique inoculation with Pseudomonas sp. ADP (9 ± 1 £ 107 CFU g¡1) resulted in rapid atrazine removal (99% of the initial 7.2 ± 1.6 lg g¡1 after 8 d), independent of citrate.
For 200£ RD, an inoculation with the atrazine-
degrading bacteria (8.5 ± 0.5 £ 107 CFU g¡1) supplemented with citrate amendment (2.4 mg g¡1) resulted in improved biodegradation
(87%) compared with bioaugmentation alone (79%), even though 7.8 ± 2.1 lg of atrazine
g¡1 still remained in the soil after 1 wk. owever, the same amount of inoculum, distributed over three successive inoculations
and combined with citrate, increased Pseudomonas sp. ADP survival and atrazine
biodegradation (to 98%, in 1 wk). We suggest
that this bioremediation tool may be valuable
for efficient removal of atrazine from contaminated field soils thus minimizing atrazine and its chlorinated derivatives from reaching water compartments.FEDER, POCI Programme, PPCDT Programme and Fundação para a Ciência e a Tecnologia,
Portuga