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Showing 1 to 20 of 54 for “"soil microorganisms"”.
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Influence of Soil Microorganisms on Plant Growth and Fitness
… terrestrial plants benefit from symbiosis with soil microorganisms. Symbiotic bacteria and fungi have wide-ranging effects on host plants, including improved nutrition, disease resistance, and drought tolerance. Association with Arbuscular Mycorrhizal Fungi (AMF) can enhance growth and protect …
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Rhizosphere/Soil Microorganisms in the Phytoremediation of Biphenyl and Dioxane
… biodegradation by poplar and willow rhizosphere microorganisms was studied in a phytoremediation test-plot contaminated with biphenyl and dioxane. A dioxane-degrading consortium enriched from the contaminated rhizosphere soil did not use dioxane as the sole source of carbon and energy, but did …
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Isolation And Characterization Of Soil Microorganisms Capable Of Utilizing Used Motor Oil For Growth
… of used motor oil using inoculums from pristine soil and used-motor oil contaminated soil was investigated. Six indigenous soil microorganisms that were capable of utilizing used-motor oil as their sole carbon-energy source were isolated from oil agar plates. These microorganisms were identified …
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The effect of simazine on nitrification and the decomposition of simazine by soil microorganisms
… and 9ppm inhibited the rate of nitrification in soil perfusion units, and an abnormally high level of nitrite nitrogen was observed in the herbicide treatments. The herbicide had no effect on the growth of Nitrosomonas europaea in shake flask culture, but did inhibit the growth of Nitrobacter …
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Assessing the role of soil chemoautotrophs in carbon cycling: An investigation into isotopically labelled soil microorganisms
… are a large, operationally defined fraction of soil organic matter. It was thought that humic substances consist of cross-linked macromolecular structures forming a distinct class of compounds. However, it was recently concluded by members of my research group that the vast majority of humic …
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The Role Of Soil Microorganisms In The Resistance Of Giant Ragweed, Horseweed, And Common Lambsquarters To Glyphosate
… to be strongly influenced by root invading soil-borne microorganisms. However, this interaction among plants, glyphosate, and soil microorganisms has only been studied in a number of crop plants, but not in weed species. This is surprising since the soil biotic environment has a strong …
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Antagonism of Streptomyces Hygroscopicus Var. Geldanus to Rhizoctonia Solani
Antagonism between soil microorganisms is a common phenomenon. However, little is known of the mechanisms by which antagonism occurs. This investigation was designed to understand the nature of antagonism between Streptomyces hygroscopicus var. geldanus and Rhizoctonia solani and the mechanism by …
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Part I. Colorimetric Methods for the Determination of 2-Chloro-4,6-Bis (ethylamino)-1,3,5-Triazine (Simazine) and Related Compounds. Part Ii. Degradation of Carbon-14-Labeled Simazine (2-Chloro-4,6-Bis(ethylamino)-1,3,5-Triazine) by Plants and Soil Microorganisms
Made available in DSpace on 2014-12-04T19:49:26Z (GMT). No. of bitstreams: 1 6001612.pdf: 4554749 bytes, checksum: 13a2ab7e30b09fe9af446d23ca619610 (MD5) Previous issue date: 1959
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Effect of aqueous neem(Azdirachta Indica A Juss) leaf extract on selected soil chemical and biological properties
Zambia has soils with low plant available nutrients due to leaching, depletion of organic matter and acidification. One way of addressing this situation is by the application of organic materials such as aqueous neem leaf extract. No known documented research has been conducted in Zambia to …
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Effect of aqueous neem(Azdirachta Indica A Juss) leaf extract on selected soil chemical and biological properties
Zambia has soils with low plant available nutrients due to leaching, depletion of organic matter and acidification. One way of addressing this situation is by the application of organic materials such as aqueous neem leaf extract. No known documented research has been conducted in Zambia to …
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The Role of Volatile Organic Compounds on Soil Microbial Communities and Ecosystem Processes
Soil microorganisms are primarily limited by carbon (C) availability. The majority of C entering belowground food webs comes directly from local flora. Plant derived labile C compounds affect microbial community structure and function, which in turn drive ecosystem function. Research has focused on …
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The Effect of Pulp Mill Effluents on the Carbon Dioxide Evolution of Three East Texas Soils
… were applied to jars containing three East Texas soils. Carbon dioxide evolution was then measured with an infrared gas analyzer to determine the effect of the effluents on the respiration of soil microorganisms. The relationship between effluent treatments was not statistically significant, …
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Field measurement of the fate of atmospheric H₂ in a forest environment : from canopy to soil
… H₂ budget is dominated by the microbe-mediated soil sink, and although its significance has long been recognized, our understanding is limited by the low temporal and spatial resolution of traditional field measurements. This thesis was designed to improve the process-based understanding of the …
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Isolation and molecular characterisation of two Pseudomonas sp. ACC deaminase genes
… α-ketobutyric acid and ammonia. ACC degrading soil microorganisms were identified by their ability to grow on ACC as a sole nitrogen source. Enzyme assays indicated that Pseudomonas had high ACC deaminase gene-specific primers and probes respectively revealed that only one bacterium, …
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Microbial Ecology: Spatial Aspects of Pesticide Degradation
… water films on bioavailability of xenobiotics to soil microorganisms was examined in the third study. Comparisons were made between two scenarios for distributing the xenobiotic relative to an inoculated degrader under a range of soil moisture conditions. Spatial proximity of xenobiotic had a …
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The individual and simultaneous effects of Cu and cypermethrin upon glycosidase, phosphomonoesterase and the total microbial activity of soil.
… used in the determination of the response of soil organisms to external pollutants. Enzymes and soil microorganisms are particularly used as bioindicators to determine the health and quality of soil following a chemical disturbance. This study chose β- glycosidase, phosphomonoesterase and the …
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Effects of land management and climate change on soil microbial communities in Appalachian forest ecosystems
In terrestrial ecosystems, microorganisms are the dominant drivers of virtually all ecosystem processes, particularly cycling of carbon (C), nitrogen (N), and phosphorus (P). These microbial functions are critical for promoting ecosystem services that support human well-being, such as provisioning …
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In situ carbon dioxide flux from Arctic tundra during freeze- up
The relationship between soil temperature and CO₂ flux from undisturbed soil cores was examined during freeze-up of arctic tundra. Three habitats which dominate tundra topography, polygon trough, ridge and basin, produced significantly different amounts of CO₂ when soil temperatures were above 0 C. …
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Seasonal responses of carbon, nitrogen, and phosphorus cycling to woodland reduction and different organic matter additions in the semiarid Great Basin
… carry ecosystem-level consequences because soil microorganisms can immobilize nutrients or render them available for plant uptake. The stochastic nature of resource availability in drylands may cause these ecosystems to be particularly susceptible to disturbance. We used two common fuel …
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