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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.17 no.3 Viçosa Sept./Dec. 1999

http://dx.doi.org/10.1590/S0100-83581999000300007 

Respiração microbiana do solo sob doses de glyphosate e de imazapyr

 

Microbial respiration under doses of glyphosate and imazapyr

 

 

Adailson P. de SouzaI; Francisco A. FerreiraII; Antônio A. da SilvaII; Antônio A. CardosoII; Hugo A. RuizIII

IProfº Adjunto do Deptº de Solos e Eng. Rural da UFPB. CEP: 58397-000, Areia/PB
IIProfº Adjunto do Deptº de Fitotecnia da UFV. CEP: 36571-000, Viçosa/MG
IIIProfº Adjunto do Deptº de Solos da UFV. CEP: 36571-000, Viçosa/MG

 

 


RESUMO

A degradação microbiana dos herbicidas no solo é influenciada por diversos fatores, dentre esses as características físicas e químicas do solo e da própria molécula, que agem continuamente determinando a sua magnitude. Em razão da grande variabilidade de respostas apresentadas por essas moléculas no solo e das poucas informações sobre o seu comportamento em ambientes tropicais, no que diz respeito a sua degradação, é que foi realizada uma série de experimentos, em laboratório, objetivando verificar a resposta da atividade microbiana do solo, pelo método da evolução do CO2 do solo, sob doses crescentes do glyphosate e do imazapyr (0; 4; 8 e 12 L ha-1 do produto comercial Roundup S.Aq.C. e Arsenal 250 S.Aq.C., respectivamente), em solos de diferentes texturas e composição química, sob três conteúdos de umidade (40, 70 e 100% do equivalente de umidade). Os resultados obtidos permitiram concluir que: a) a microbiota do solo é capaz de utilizar o glyphosate e o imazapyr como fontes de carbono; b) a umidade do solo influencia a capacidade de os microrganismos degradarem o glyphosate e o imazapyr; c) a umidade de 40%, nos solos avaliados, proporcionou as menores respostas da atividade dos microrganismos, independentemente das doses dos herbicidas; e d) o efeito das doses do imazapyr sobre a atividade microbiana do solo é influenciado pelas características físicas e químicas dos solos.

Palavras chave: Atividade microbiana, biodegradação, herbicida.


ABSTRACT

The microbial degradation of herbicides in soil is affected by several factors such as the chemical and physical characteristics of the soil and the proper molecule which act continuously determining the degradation magnitude. Considering the large variability of the responses presented by these molecules in the soil as well as the scarce information about their behavior in tropical environments relatively to their degradation, a series of experiments was carried out under laboratory conditions aiming to verify the response of soil microbial activity by the soilCO2 evolution method under increasing doses of glyphosate and imazapyr (0; 4; 8 and 12 L ha-1 of the commercial product Roundup S.Aq.C. and Arsenal 250 S.Aq.C., respectively) in soils with different textures and chemical composition under three moisture contents (40; 70 and 100% of the moisture equivalent). The obtained results allowed to conclude that: a) the soil macrobiota is able to use the glyphosate and imazapyr as carbon sources; b) the soil moisture affects the microorganisms capacity to degrade the glyphosate and imazapyr; c) the 40% moisture in the studied soils caused the lowest influenced by the soil chemical and physical responses of microorganism activities characteristics. independently of the herbicide doses; d) the effect of imazapyr doses on the soil microbial activity is influenced by the soil chemical and physical characteristics.

Key words: Microbial activity, biodegradation, herbicide.


 

 

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Recebido para publicação em 06/06/98 e na forma revisada em 06/08/99.

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