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Qualification and quantification of microorganisms in soil role of microorganisms in the nitrogen cycle.
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Letort Vanessa Student Number: 2029474 Module Number: HEV 3211 Purchase Diane SOIL MICROBIOLOGY QUALIFICATION AND QUANTIFICATION OF MICROORGANISMS IN SOIL ROLE OF MICROORGANISMS IN THE NITROGEN CYCLE INTRODUCTION Microbial community plays an important role in soils. These organisms are diverse and dynamic, performing beneficial activities such as decomposing organic matter, making nitrogen available and, sometimes, suppressing certain undesirable soil pathogens (Graham & Mitchell, 1997). The active part of soil is actually quite small, 1 to 5 percent by mass is microscopic organisms like bacteria and fungi. Yet the living microbial biomass most readily metabolises organic compounds, contributes significantly to short-term plant nutrition, and is the most responsive to land use (Scholes and Scholes, 1995). The most numerous and common microorganisms are the bacteria, followed by the actinomycetes and fungi (Porteous, 2000). Bacteria consist of a very diverse and highly variable group of single-celled, prokaryotic organisms found in soils of every ecosystem. The bacterial population of soils is dominated by species...
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