Effect of pesticides on acetylene reduction and microorganisms in a sandy loam

Tu, C. M.

doi:10.1016/0038-0717(78)90035-4

Cited by 37 publications

(8 citation statements)

References 28 publications

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“…It was recovered to a similar level of control at 21 day and slight increase was achieved at 28 d compared with untreated check recorded 66.26 CFU × 10 4 /g dw. This result agree with previous studies reduce fungal biomass or counts, but increase bacterial biomass or counts (Duah-Yentumi and Johnson, 1986;Monkiedje et al, 2002) significant decrease in bacterial numbers with subsequent recovery is also reported (Tu, 1978) ,. In contrast to the results here, significant inhibition was observed in previous study (Das and Mukherjee 2000, Boucard et al, 2008, Rache and Coats, 1988Das et al, 1995) who reported that, tested insecticides(HCH, phorate, carbofuran and fenvalerate at their recommended field rates did not have any deleterious effect on the growth and activities of the major soil microorganisms responsible for the transformations of C, N and P. and.…”

Section: Discussionsupporting

confidence: 93%

Field and Laboratory Studies for Evaluating the Toxicity of Some Pesticides on Soil Microorganisms.

Hussien

Shaheen

Shaker³

et al. 2012

Journal of Plant Protection and Pathology

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Incessant and indiscriminate use of some agrochemicals in agricultural production has elicited fears of changes in microbial populations and the activities of individual species of microorganisms. Present study was carried out to study the effect of three pesticides (Chloropyrifos (1L/200L.Water), Lambada cyhalothrin(50g/100L.Water) and Emamectin benzoate(120g/400LWater)) at field application rate on total population count of microorganism in phasoulus vulgaris field. Also measured the sensitivity of some species, bacteria (Rhizobium leguminosarum. And Bacillus thuringiensis) , fungi (Trichoderma harzianum and Trichoderma viridi) and actinomycetes (Streptomyces griseorubens and Streptomyces cavourensis at field and double application rate to these pesticides. Data indicated that, Chloropyrifos stimulated significantly the proliferation of all of the microorganism. Lambada-cyhalothrin decreased population of Bactria at 1 DAT (day after treatment) until 15 DAT and returned to increase at 21 DAT. For fungal population, the total count of the soil fungi was decreased after the addition of Lambada-cyhalothrin. Actinomycetes was also significantly inhibited during the period from 1 to 15 DAT by Lambada-cyhalothrin, and subsequently recovered to a similar level of control. Emamectin benzoate in general increased population of bacteria and actinomycetes and decreased population of fungi. Concerning the sensitivity study we found that , Chloropyrifos inhibited significantly the growth of the tested species at different rates with a positive correlation. Chloropyrifos was the most potent compound followed by Lambada-cyhalothrin while Emamectin benzoate did not happen any effect on tested species. For radical growth of T.harzianum and T. viridi Chloropyrifos , Lambada-cyhalothrin and Emamectin benzoate showed the same level in its impact on the bacteria and actinomycetes

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Section: Discussionsupporting

confidence: 93%

Field and Laboratory Studies for Evaluating the Toxicity of Some Pesticides on Soil Microorganisms.

Hussien

Shaheen

Shaker³

et al. 2012

Journal of Plant Protection and Pathology

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“…The addition of methylpyrimifos at a concentration of 50 to 300 ~g g-1 and chlorpyrifos at agricultural doses may disturb this equilibrium and thus, the fertility of soil. Similar results for chlorpyrifos and other pesticides were reported Tam and Trevors, 1981;Tu, 1978). However, the degree to which the effects can be extrapolated to field conditions deserves more attention because a number of factors, for example, climate and agricultural practice, also influence the effects of those insecticides.…”

Section: Discussionsupporting

confidence: 66%

Effect of the insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam

1992

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“…Previous reports on the effect of pesticides on heterotrophic N 2 fixation in soils showed that both stimulatory and inhibitory effects of individual pesticides were possible (Tu, 1978;Nayak & Rao, 1980). In the present investigation data were provided on the effects of water regime and combination effects of insecticide and herbicides on N 2 fixation with and without rice straw amendment.…”

Section: Resultsmentioning

confidence: 81%

“…1980;Watanabe & Roger, 1984). The influence of several pesticides on growth and N 2 fixation was investigated in pure cultures (Mackenzie & MacRae, 1972;Charyulu & Rao, 1978;Tu, 1978). Few data are available on the effect of pesticides on N 2 fixation in paddy soils although these are employed extensively in practice ' (Nayak & Rao, 1980, 1982Rao, Pasalu & Rao, 1983).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fixation as influenced by pesticides and rice straw in paddy soils

Jena

Rao

1987

J. Agric. Sci.

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SummaryThe effect of three herbicides and an insecticide combination on nitrogen fixation in three paddy soils was investigated in a laboratory incubation study. The influence of pesticide combination on N2 fixation was evaluated in the presence and absence of rice straw under flooded and non-flooded conditions. In a non-flooded alluvial soil single or combined application of butachlor and carbofuran significantly stimulated N2 fixation. There was no effect on N2 fixation when thiobencarb was applied alone; but with thiobencarb in combination with carbofuran higher N2 fixation occurred. Both oxadiazone and thiobencarb had no effect on N2 fixation under flooded conditions, but in combination with carbofuran the N2 fixation was high. In acid sulphate saline Pokkali soil, rice straw application stimulated N2 fixation; the stimulatory effect of carbofuran either alone or in combination became more pronounced under flooded conditions. N2 fixation was low in a laterite Sukinda soil and the effect of pesticides was not changed by rice straw amendment. A uniform stimulation of N2 fixation occurred in soils when carbofuran was applied either singly or in combination with other herbicides tested. Results indicate that the effect of pesticides on N2 fixation varied with the rice straw application and water regime.

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Effect of pesticides on acetylene reduction and microorganisms in a sandy loam

Cited by 37 publications

References 28 publications

Field and Laboratory Studies for Evaluating the Toxicity of Some Pesticides on Soil Microorganisms.

Field and Laboratory Studies for Evaluating the Toxicity of Some Pesticides on Soil Microorganisms.

Effect of the insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam

Nitrogen fixation as influenced by pesticides and rice straw in paddy soils

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