Urease activity and its Michaelis constant for soil systems

Beri, V.; Goswami, Kishore P.; Brar, S. S.

doi:10.1007/bf02149912

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…This organic carbon serves as a source of carbon and energy for microbial metabolism, which releases CO 2 , which in turn is transformed into bicarbonates, increasing the acidity of the substrate (Brady and Weil 2008). The results of the present study, which showed a higher enzymatic activity of urease in dry straw and its relationship with the greater amount of SOC and CO 2 , agrees with the results reported by Beri et al (1978) for sugarcane straw. They indicated that microbial metabolism (CO 2 ) occurs due to the presence of heterotrophic microorganisms and the release of extracellular hydrolytic enzymes into the organic substrate.…”

Section: Discussionsupporting

confidence: 93%

The Burning of Sugarcane Plantation in the Tropics Modifies the Microbial and Enzymatic Processes in Soil and Rhizosphere

Trujillo-Narcía

Rivera-Cruz

Magaña-Aquino

et al. 2019

J Soil Sci Plant Nutr

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In this study were examined chemical, microbiological, and enzymatic changes at different depths of the soil and rhizosphere, produced by the burning of a commercial sugarcane crop in tropical areas of México. Samples of silty loamy soil and rhizosphere were collected at three times in the sugarcane production cycle: before burning (BB), after first burning (AFB), and after second burnings (ASB), with a general interval of 15 days between the first and the third collection date. Soil organic matter (SOM), soil organic carbon (SOC), total nitrogen (Nt), phosphorus available (Pav), pH, and the C/N ratio were determined in soil and rhizosphere, as well as the enzymatic activities of phosphatase and urease. Furthermore, microbial respiration, microbial biomass, and nitrogen-fixing bacteria (NFB) and phosphate solubilizing bacteria (PSB) densities were monitored during 84 days. The Pav and the pH increased significantly in soil samples affected by the second burning of the stubbles, but SOM, SOC, Nt, the C/N ratio, phosphatase, and urease activities decreased as a result of the first and second burnings. This decrease was more pronounced in non-rhizospheric soil. The densities of NFB and PSB increased with the burning, as well as microbial respiration. All the variables evaluated recorded higher values in the soil surface layer.

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Section: Discussionsupporting

confidence: 93%

The Burning of Sugarcane Plantation in the Tropics Modifies the Microbial and Enzymatic Processes in Soil and Rhizosphere

Trujillo-Narcía

Rivera-Cruz

Magaña-Aquino

et al. 2019

J Soil Sci Plant Nutr

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“…This may be attributed to the continual addition of enzyme released from the plant roots TM and also due to associated microorganisms 13,21. With increase in organic carbon content enzyme activities 2 found that soil urease activity is largely controlled by the organic carbon status of the various soils. The positive correlations of urease activity with organic carbon and total nitrogen suggested that organic matter content accounted for most of the variations in soil urease activity 28.…”

Section: Resultsmentioning

confidence: 99%

Dehydrogenase and urease activities of maize (Zea mays L.) field soils

Dkhar

Mishra

1983

Plant Soil

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SummaryDehydrogenase and urease activities, bacterial and fungal populations and physicochemical characteristics of maize (Zea mays L.) field soils have been studied for one crop cycle. A comparison has been made among soils of three different agricultural systems viz permanent agriculture on plain lands in valleys, recently introduced terrace land agriculture and age old 'slash and burn' type of shifting agriculture on slopes. Results demonstrate that the enzyme activities, microbial population as well as most of the physico-chemical characteristics of soils followed the trend permanent agriculture on plain lands > terrace land agriculture > 'slash and burn' type of shifting agriculture. Moisture and nutrient levels and topography of the lands were found to be major factors responsible for the trend.

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“…The catalytic efficiency of soil enzymes V max /K m (Gianfreda et al, 1995) was highly affected by soil organic matter content and soil texture (Bery et al, 1978;Zaman et al, 1999;Garcia et al, 1993). Higher V max /K m of test soil enzymes was found in the test soils containing more organic matter and having better texture.…”

Section: Discussionmentioning

confidence: 99%

Catalytic Potential of Soil Hydrolases in Northeast China Under Different Soil Moisture Conditions

Zhang

Sun

Chen

et al. 2009

R.C. Suelo Nutr. Veg.

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An incubation test with black soil (Phaeozem), Albic soil (Albic Luvisols), brown soil (Cambisols), and cinnamon soil (Chromic Luvisol) from Northeast China was conducted under the conditions of 10%, 20% and30 % field capacity, and the kinetic parameters of soil urease, phosphatase, and arylsulphatase were determined, aimed to study the changes in the catalytic potential of these enzymes under different soil moisture conditions. All test enzymes exhibited typical Michaelis-Menten kinetic behaviors. The test enzymes exhibited the highest enzyme-substrate affinity (1/K m ) at 20% or 30% field capacity. With increasing soil moisture content, the V max of test soil urease decreased, while that of soil phosphatase and arylsulphatase increased, with the maximum V max /K m of urease at 20% field capacity and that of phosphatases and arylsulphatase at 30% field capacity. To control soil moisture condition could be a feasible way in regulating the biochemical transformation processes of soil nutrients catalyzed by soil hydrolases.

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Urease activity and its Michaelis constant for soil systems

Cited by 17 publications

References 17 publications

The Burning of Sugarcane Plantation in the Tropics Modifies the Microbial and Enzymatic Processes in Soil and Rhizosphere

The Burning of Sugarcane Plantation in the Tropics Modifies the Microbial and Enzymatic Processes in Soil and Rhizosphere

Dehydrogenase and urease activities of maize (Zea mays L.) field soils

Catalytic Potential of Soil Hydrolases in Northeast China Under Different Soil Moisture Conditions

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