Effects of N-enriched sewage sludge on soil enzyme activities

Kizilkaya, Rıdvan; Bayraklı, Betül

doi:10.1016/j.apsoil.2005.02.009

Cited by 154 publications

(80 citation statements)

References 51 publications

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“…Phosphatase activity was higher in the rhizosphere than in the bulk soil, which confirms a higher microbial activity in this zone caused by a higher content of easily degradable root exudates (Figure 3). An increased activity was found at the variant with sewage sludge compared to the control, which is in good agreement with the work of Kizilkaya and Bayrakli (2005). From the figures mentioned above, it is clear that the increased activity was found at the variant with manure compared to the variant with sewage sludge.…”

Section: Resultssupporting

confidence: 87%

“…Nannipieri et al (1978) and Spiers and McGill (1979) state, that organic fertilizers stimulate phosphatase activity in the rhizosphere of cereals due to the increased microbial activity in the soils. At the same time, the activity was inhibited by inorganic soil P. Furthermore, in the experiment of Kizilkaya and Bayrakli (2005) the addition of sewage sludge to soils increased the activity of alkaline phosphatase. On the other hand, Speir et al (2007) showed that the activity of the acidic phosphatase was partly inhibited at high dosages of applied sewage sludge.…”

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confidence: 90%

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The influence of long-term sewage sludge application on the activity of phosphatases in the rhizosphere of plants

Balík¹,

Pavlı́ková²,

Vaněk³

et al. 2007

PLANT SOIL ENVIRON

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Model experiments using rhizoboxes were carried out in order to evaluate the influence of different plants (wheat, rape) on the changes in water extractable contents of P, the pH/H 2 O value and the activity of acidic and alkaline phosphatase in soil of plant rhizosphere. For this experiment, a Cambisol with different long-term fertilizing systems was used: (i) control (with no fertilizer application), (ii) sewage sludge, and (iii) manure. A lower content of water-soluble P was observed in close vicinities of root surfaces (up to 2 mm) at all the studied variants. The control (non-treated) variant reflected a significantly lower content of water-soluble P in the rhizosphere compared to the fertilized ones. The activities of the acidic and alkaline phosphatases were significantly higher in the rhizosphere compared to the bulk soil (soil outside the rhizosphere). The long-term application of organic fertilizers significantly increased phosphatase activity; the activity of the acidic phosphatase was significantly higher in the rhizosphere of rape plants compared to wheat. The variant treated with manure exhibited an increased activity of both the acidic and alkaline phosphatases compared to the variant treated with sewage sludge. In the case of the variant treated long-term with sewage sludge, the portion of inorganic P to total soil P content proportionally increased compared to the manure-treated variant. Soil of the rape rhizosphere showed a trend of lower pH/H 2 O value of all variants, whereas the wheat rhizosphere showed an opposite pH tendency.

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Section: Resultssupporting

confidence: 87%

mentioning

confidence: 90%

The influence of long-term sewage sludge application on the activity of phosphatases in the rhizosphere of plants

Balík¹,

Pavlı́ková²,

Vaněk³

et al. 2007

PLANT SOIL ENVIRON

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“…In general, enzymatic activity in the initial states of the assay agrees with Kizilkaya and Bayrakli (2005) who indicate that this is due to the presence of easily decomposing substrates provided by sewage. Furthermore, activity over time in treatments without crops coincides with Madejón et al (2001) who associate the progressive decrease of enzymatic activity with the lack of plants.…”

Section: Treatmentssupporting

confidence: 85%

Biological Activity in a Degraded Alfisol Amended with Sewage Sludge and Cropped with Yellow Serradela (Ornithopus compressus L.)

Celis¹,

H²,

E³

et al. 2011

Chilean J. Agric. Res.

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There are few studies about the impact of sewage sludge on the biological properties in Alfisols of the Chilean Coastal Range drylands. Hence, the objective of this study was to evaluate its effect on the microbial respiration and enzymatic activities of a degraded Alfisol located in the Bío Bío Region (Chile) that was cropped with yellow serradela (Ornithopus compressus L.). Sludge was added to the soil at rates of 15, 30, and 60 t ha -1 ; he following treatments were defined: L15-P = 15 t ha -1 sludge + O. compressus; L30-P = 30 t ha -1 sludge + O. compressus; L60-P = 60 t ha -1 sludge + O. compressus; L15 = 15 t ha -1 sludge; L30 = 30 t ha -1 sludge; L60 = 60 t ha -1 sludge; CP = non-amended soil, cropped; and C = non-amended soil, no crop. Soil microorganism activity was evaluated by respirometry. Hydrolytic enzyme activity representative of soil C, N, and P cycles was determined. Crop phytomass development was also evaluated. The amount of C-CO2 produced by soil microorganisms was directly proportional to the dose of amended sludge (p ≤ 0.05). Similarly, greater β-glucosidase, urease, and acid phosphatase were more active at 60 t sludge ha -1 . However, both respiratory and enzymatic activities were greater (p ≤ 0.05) in treatments with sludge-amended soil cropped with O. compressus. This greater activity was notorious when the legumes achieved greater phytomass development, thus highlighting the root's stimulating effect on soil biological activity.

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“…Urease (URE; urea amidohydrolase, EC 3.5.1.5) activity was measured by the method described by Kızılkaya and Bayraklı (2005) with minor modification. Briefly, 1 g of soil sample was mixed with 0.25 mL toluene, 0.75 mL citrate buffer (pH 6.7), and 1 mL of 10% urea substrate solution.…”

Section: Soil Microbial Activitiesmentioning

confidence: 99%

Effects of Cd and Pb on soil microbial community structure and activities

Khan

Hesham

Qiao

et al. 2009

Environ Sci Pollut Res

340

132

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Background, aim, and scope Soil contamination with heavy metals occurs as a result of both anthropogenic and natural activities. Heavy metals could have long-term hazardous impacts on the health of soil ecosystems and adverse influences on soil biological processes. Soil enzymatic activities are recognized as sensors towards any natural and anthropogenic disturbance occurring in the soil ecosystem. Similarly, microbial biomass carbon (MBC) is also considered as one of the important soil biological activities frequently influenced by heavy metal contamination. The polymerase chain reaction-denaturing gradient gel electrophoresis (DGGE) has recently been used to investigate changes in soil microbial community composition in response to environmental stresses. Soil microbial community structure and activities are difficult to elucidate using single monitoring approach; therefore, for a better insight and complete depiction of the soil microbial situation, different approaches need to be used. This study was conducted in a greenhouse for a period of 12 weeks to evaluate the changes in indigenous microbial community structure and activities in the soil amended with different application rates of Cd, Pb, and Cd/Pb mix. In a field environment, soil is contaminated with single or mixed heavy metals; so that, in this research, we used the selected metals in both single and mixed forms at different application rates and investigated their toxic effects on microbial community structure and activities, using soil enzyme assays, plate counting, and advanced molecular DGGE technique. Soil microbial activities, including acid phosphatase (ACP), urease (URE), and MBC, and microbial community structure were studied. Materials and methods A soil sample (0-20 cm) with an unknown history of heavy metal contamination was collected and amended with Cd, Pb, and Cd/Pb mix using the CdSO 4 and Pb(NO 3 ) 2 solutions at different application rates. The amended soils were incubated in the greenhouse at 25±4°C and 60% water-holding capacity for 12 weeks. During the incubation period, samples were collected from each pot at 0, 2, 9, and 12 weeks for enzyme assays, MBC, numeration of microbes, and DNA extraction. Fumigationextraction method was used to measure the MBC, while plate counting techniques were used to numerate viable heterotrophic bacteria, fungi, and actinomycetes. Soil DNAs were extracted from the samples and used for DGGE analysis. Results ACP, URE, and MBC activities of microbial community were significantly lower (p <0.05) in the metal-amended samples than those in the control. The enzyme inhibition extent was obvious between different incubation periods and varied as the incubation proceeded, and the highest rate was detected in the samples after 2 weeks. However, the lowest values of ACP and URE activities (35.6% and 36.6% of the control, respectively) were found in the Cd 3 /Pb 3 -treated sample after 2 weeks. Similarly, MBC was strongly decreased in both Cd/Pbamended samples and highest reduction (52.4%) was Envir...

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Effects of N-enriched sewage sludge on soil enzyme activities

Cited by 154 publications

References 51 publications

The influence of long-term sewage sludge application on the activity of phosphatases in the rhizosphere of plants

The influence of long-term sewage sludge application on the activity of phosphatases in the rhizosphere of plants

Biological Activity in a Degraded Alfisol Amended with Sewage Sludge and Cropped with Yellow Serradela (Ornithopus compressus L.)

Effects of Cd and Pb on soil microbial community structure and activities

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