Soil microbial biomass C and symbiotic processes associated with soybean after sulfentrazone herbicide application

Vieira, R. F.; Silva, Célia Maria M. S.; Silveira, Adriana Parada Dias da

doi:10.1007/s11104-007-9392-4

Cited by 35 publications

(22 citation statements)

References 47 publications

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“…Vários autores relataram o efeito adverso do glyphosate no número de nódulos de plantas de soja (Reddy et al, 2000;Reddy & Zablotowicz, 2003;Zablotowicz & Reddy, 2007;Dvoranen et al, 2008). Todavia, na presença de endossulfan + tebuconazole não foi constatado efeito negativo do glyphosate sobre o NN.…”

Section: Resultsunclassified

“…Esses mesmos autores não verificaram tal efeito quando o feijão foi cultivado no sistema de plantio direto. Em trabalho realizado por Vieira et al (2007), foi observada redução drástica (mais de 50%) na colonização micorrízica em plantas de soja IAC-22 até 75 dias após aplicação do herbicida sulfentrazone. * Plantas de soja coletadas no estádio R 2 , ou seja, 50% do florescimento pleno.…”

Section: Resultsunclassified

“…Vários trabalhos confirmam a interferência negativa do glyphosate sobre microrganismos fixadores de nitrogênio em plantas de soja (Santos et al, 2005(Santos et al, , 2007Zablotowicz & Reddy, 2007;Dvoranen et al, 2008;Zilli et al, 2008). Os efeitos do glyphosate sobre fungos micorrízicos arbusculares na soja são pouco esclarecidos, haja vista a escassez de informação, com poucos trabalhos abordando o assunto (Morandi, 1989;Mujica et al, 1999;Malty et al, 2006).…”

Section: Introductionunclassified

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Impacto do glyphosate associado com endossulfan e tebuconazole sobre microrganismos endossimbiontes da soja

Reis

Silva

Pereira³

et al. 2010

Planta daninha

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RESUMO -Objetivou-se neste trabalho avaliar o efeito do glyphosate, em aplicação sequencial, e da sua interação com endossulfan + tebuconazole na colonização micorrízica, na nodulação e nos teores de fósforo e nitrogênio foliar em plantas de soja. O experimento foi conduzido a campo em Argissolo Vermelho-Amarelo câmbico, no ano agrícola de 2007/08. Foram avaliados dez tratamentos em em esquema de parcelas subdivididas, no delineamento de blocos casualizados, com quatro repetições. Nas parcelas, avaliou-se o efeito da aplicação ou não da mistura de inseticida (endossulfan) + fungicida (tebuconazole) e, nas subparcelas, o efeito dos métodos de controle de plantas daninhas (testemunha não capinada, testemunha capinada, aplicação única de glyphosate, aplicação sequencial de glyphosate e aplicação única de fomesafen + fluazifop-p-butil). A matéria seca de nódulos (MSN) e da parte aérea (MSPA), o número de nódulos (NN), a colonização micorrízica e os teores de N e P foliar foram avaliados quando as plantas de soja atingiram o estádio R 2 . O glyphosate e fomesafen + fluazifop-p-butil não reduziram a MSN de plantas de soja, exceto na presença de endossulfan + tebuconazole. O glyphosate em aplicação sequencial, na ausência de endossulfan + tebuconazole, reduziu o NN das plantas de soja em relação às plantas tratadas com inseticida + fungicida. A mistura fomesafen + fluazifop-p-butil e o glyphosate em aplicação sequencial afetaram negativamente os teores de N foliar em relação à testemunha capinada na ausência de endossulfan + tebuconazole, enquanto que na presença dessa mistura não se observou efeito. O glyphosate não afetou a colonização micorrízica em soja tratada ou não com a mistura endossulfan + tebuconazole. Já a mistura de fomesafen + fluazifop-p-butil estimulou a colonização micorrízica na ausência da mistura endossulfan + tebuconazole. O glyphosate, em aplicação sequencial, não afetou a colonização micorrízica e a nodulação da da soja.Palavras-chave: fungos micorrízicos, bactérias fixadoras de N 2 , Roundup Ready.ABSTRACT -The objective of this work was to evaluate the effects of glyphosate, in sequential applications, and its interaction with endosulphan + tebuconazole on mycorrhizal colonization, nodulation, and leaf concentrations of P and N of soybean plants. The experiment was conducted in the field in a Yellow-Red Argisol in the 2007/2008 crop year. Ten treatments were installed in split plots following a randomized block design with four replications. Endosulphan + tebuconazole application was done in the main plots, while the different methods of weed control in the sub-plots (unhoed control, hoed control, single application of glyphosate, sequential application of glyphosate, single application of fomesafen + fluazifop-p-butyl). Shoot and nodule dry matter, nodule number,

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Section: Resultsunclassified

Section: Introductionunclassified

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Impacto do glyphosate associado com endossulfan e tebuconazole sobre microrganismos endossimbiontes da soja

Reis

Silva

Pereira³

et al. 2010

Planta daninha

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“…Viera et al (2007) showed that as time elapsed, the negative effects of sulfentrazone herbicides on soil microbial biomass C decreased. We observed that the pattern of DAB effects on N mineralization varied (Figures 1 and 2).…”

Section: Resultsmentioning

confidence: 99%

Kinetic approach to evaluate the effects of 3,3'-diaminobenzidine on N mineralization in soils

Seh-Bardan¹,

Nourbakhsh²,

Ghiasi³

2010

PLANT SOIL ENVIRON

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It has been demonstrated that azo dyes, the xenobiotics widely use in industries, can pose threats to public health. 3,3'-diaminobenzidine (DAB), as a benzidine analogue, is generated from reduction of azo dyes by intestinal or environmental microorganisms. The compound was applied at doses of 0 and 100 mg N/kg into two soils of contrasting textural properties belonging among Haplic Calsisols (Juzdan soil) and Calcaric Cambisols (Shervedan soil) and the effects on N mineralization kinetics were evaluated. Kinetic behavior of N mineralization in either the control or the DAB-treated soils consistently followed first-order models. In the early 7-10 days of the incubation period, net N mineralization was adversely influenced by DAB. After the early 7-10 days of incubation, the accumulation of inorganic N was greater in DAB-treated soils than those of control soils. This finding indicated that the degradation of DAB was started. Potentially mineralizable N in Haplic Calsisols and Calcaric Cambisols were 1.1 and 1.4 times greater than those of controls, respectively. Similarly, initial potential rates of N mineralization in the DAB-treated soils were 1.3 and 1.1 times greater than those of controls, respectively. The potentially mineralizable N and initial potential rates of N mineralization in both soils were significantly (LSD, P < 0.05) increased when soils were treated with DAB. About 95 and 82% of the initial DAB-N were mineralized to inorganic N after 60 days of aerobic incubation, respectively. Overall, DAB can be a potentially toxic xenobiotic for soil N mineralization shortly after application and the rate of its inhibition or stimulation is time-dependent.

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“…Arruda et al (2001) observaram redução na nodulação radicular e nos aminoácidos exsudados pelo xilema da soja após a aplicação do herbicida sulfentrazone. Esse composto também influencia negativamente a associação da cultura com fungos micorrízicos (Vieira et al, 2007). Aos 14 DAH, não se observou diferença entre os cultivares para o PSFI (Tabela 5).…”

Section: Menores Valores De Cbm Foram Observados Nos Tratamentos Com unclassified

Impacto de herbicidas na biomassa microbiana e nos microrganismos solubilizadores de ortofosfato do solo rizosférico de cana-de-açúcar

et al. 2009

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-This work aimed to evaluate soil microbial biomass carbon (MBC), phosphate solubilization potential (PSP), and relative phosphate solubilization potential (RPSP) in the rhizosphere soil of sugarcane cultivars after herbicide application. The trial was installed under field conditions in a conventional tillage system, using a completely randomized block design with four replications. The treatments corresponded to two sugarcane varieties, RB86-7515 and SP80-1816, and the herbicides ametryn (2,000 g ha -1 ), trifloxysulfuron-sodium (22.5 g ha -1 ), trifloxysulfuron-sodium + ametryn (37 + 1,463 g ha -1 ), sulfentrazone (750 g ha -1 ), and an untreated control plot. The herbicide was applied when plants presented 3 to 4 leaves. Soil samples were collected at 7, 14, and 28 days after herbicide application (DAH) for the MBC, PSIF, and RPSP evaluations. MBC in the rhizospheric soil of RB86-7515 was less affected by the herbicides at 7 DAH, compared to SP80-1816. Trifloxysulfuron-sodium stimulated PSIF (21.11%), while ametryn reduced its activity. Sulfentrazone did not affect PSIF. The sugarcane varieties tested varied in their capacity to associate with soil microorganisms, resulting in different responses of the soil microbiota to the herbicides.

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Soil microbial biomass C and symbiotic processes associated with soybean after sulfentrazone herbicide application

Cited by 35 publications

References 47 publications

Impacto do glyphosate associado com endossulfan e tebuconazole sobre microrganismos endossimbiontes da soja

Impacto do glyphosate associado com endossulfan e tebuconazole sobre microrganismos endossimbiontes da soja

Kinetic approach to evaluate the effects of 3,3'-diaminobenzidine on N mineralization in soils

Impacto de herbicidas na biomassa microbiana e nos microrganismos solubilizadores de ortofosfato do solo rizosférico de cana-de-açúcar

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