Characteristics of 2,4-dichlorophenoxyacetic acid (2,4-D)-degrading microorganisms isolated from different soils

Miwa, Noriko; Kuwatsuka, Shozo

doi:10.1080/00380768.1991.10416925

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The rapid decrease in 2,4‐D concentration in solution could be caused by the adsorption of 2,4‐D by the soil. Microbial degradation has also been reported to be partly responsible for 2,4‐D disappearance in soil‐solution systems, but microbial degradation will only be observable after several days of reaction time (Miwa and Kuwatsuka, 1991; Estrella et al, 1993; Johnson et al, 1995; Mallawatantri et al, 1996). Thus, in this experiment, it was assumed that the rapid decrease in 2,4‐D concentration in solution which occurred during the first 4 h was due to adsorption reactions.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of 2,4‐Dichlorophenoxyacetic Acid by an Andosol

et al. 2007

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To identify the important soil components involved in 2,4-dichlorophenoxyacetic acid (2,4-D) adsorption on Andosols, 2,4-D adsorption on a surface horizon of an Andosol was compared with that on hydrogen peroxide (H2O2)-treated (soil organic matter [SOM] was removed), acid-oxalate (OX)-treated (active metal hydroxides and SOM were removed), and dithionite-citrate-bicarbonate (DCB)-treated (free and active metal [hydr]oxides and SOM were removed) soil samples at equilibrium pHs ranging from 4 to 8. Although the untreated soil contained a large amount of organic C (71.9 g kg-1), removal of SOM had little effect on 2,4-D adsorption. Active surface hydroxyls, which were attached to the active and free metal (hydr)oxides and metal SOM complexes, were identified as the most important soil functional group for 2,4-D adsorption. The dominant mechanism of the 2,4-D adsorption was a ligand exchange reaction in which the carboxylic group of 2,4-D displaced the active surface hydroxyl associated with metals and formed a strong coordination bond between the 2,4-D molecule and soil solid phase. The ligand exchange reaction reasonably accounted for the selective adsorption of 2,4-D over Cl-, competitive adsorption of phosphate over 2,4-D, reduction in plant-growth-inhibitory activity of soil-adsorbed 2,4-D, and the high 2,4-D adsorption ability of Andosols. Although a humic acid purified from the soil did not adsorb 2,4-D, the presence of the humic acid increased 2,4-D adsorption on Al and Fe, probably by inhibiting the hydrolysis and polymerization of Al and Fe resulting in the preservation of available adsorption sites on these metals. The adsorption behavior of 2,4-D on soils could be a good index for predicting the adsorption behavior of other organic acids in soils.

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Section: Resultsmentioning

confidence: 99%

Adsorption of 2,4‐Dichlorophenoxyacetic Acid by an Andosol

et al. 2007

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Green manure production of Azolla microphylla and Sesbania rostrata and their long-term effects on rice yields and soil fertility

Ventura

Watanabe

1993

Biol Fertil Soils

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Estimation of nitrogen fixation in anAzolla-rice association using the nitrogen-15 isotope dilution technique

Galal

1997

Biol Fert Soils

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The ISN isotope dilution technique was used for the quantification of N2 fixation by Azolla spp. and the availability of Azolla-N and urea-N to rice plants. Nitrogen released from labelled urea and Azolla spp., added individually or as a mixture, was estimated in both normal and sterilized soils. A total of 40 mg N kg -1 soil as urea, Azolla spp. and a combination of Azolla spp. and urea were applied to rice plants grown in pots. On the basis of overall soil conditions, percentage 15N recovery by rice, dry matter yield and N-uptake increases after A. pinnata incorporation were similar to those obtained from urea. The proportion of N uptake by rice plants derived from urea (%NdfU) or Azolla (%NdfAz) was identical for the treatments which received the same N rate from both sources.Incorporation of 15N-labelled A. pinnata into the soil gave an 15N recovery by rice (shoots and roots) of 40% and 24%, for the sterilized and normal soil, respectively. Nitrogen derived from A. pinnata (%NdfAz) ranged from 29% to 43% when 15N urea and unlabelled Azolla were applied. A highly significant correlation (r=-0.99) was found between NdfAz and the dry mass of shoots and roots of rice. A similar correlation was recorded between NdfAz and total N uptake by wetland rice.

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Characteristics of 2,4-dichlorophenoxyacetic acid (2,4-D)-degrading microorganisms isolated from different soils

Cited by 4 publications

References 5 publications

Adsorption of 2,4‐Dichlorophenoxyacetic Acid by an Andosol

Adsorption of 2,4‐Dichlorophenoxyacetic Acid by an Andosol

Green manure production of Azolla microphylla and Sesbania rostrata and their long-term effects on rice yields and soil fertility

Estimation of nitrogen fixation in anAzolla-rice association using the nitrogen-15 isotope dilution technique

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