Biosphere

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Soil Microbiology Origin of Life Origin of Land Plants Beginnings of Agriculture Biosphere Turnover of Carbon Turnover of Nitrogen

Biosphere

The Biosphere

The actual estimates of time in the sequence of events described above are not important but ht trend is clear enough to state that solar energy initiated photosynthetic life in the primordial earth as a consequence of which, earth’s primitive atmosphere changed into an oxygenated condition. Since then, evolution of life has progressed on divergent lines and the elements, carbon, nitrogen, hydrogen and oxygen have undergone a series of recycling processes through assimilation and decomposition,thereby creating a ‘biosphere’ wherein microorganisms, plants, animals and man have lived in equilibrium for centuries.

In recent years, attempts have been made to estimate the amounts of carbon and nitrogen transferred within the different ecosystems of the biosphere but the figures for the two elements in the biosphere may, however, be taken only as broad guidelines. Nonetheless, the pathways by which the elements get transferred within different ecosystems have been clearly understood and some of them fall in the purview of plant-soil microorganisms’ interactions. Apart from the carbon and nitrogen transformations in the biosphere which are of great magnitude, other elements like oxygen, hydrogen, phosphorus, sulphur and iron undergo mutual transfers in the biosphere between ecosystems and some of these change are also linked with plants and soil microorganisms.

The Chronology of events in the history of the earth with particular reference to origin of life and development of microorganisms and land plants

The Chronology of events in the history of the earth with particular reference to origin of life and development of microorganisms and land plants

The chronology of events in the history of the earth with particular reference to origin of life and development of microorganisms and land plants

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Beginnings of Soil Science Major Types of Beneficial Interactions Associations Between Plants and Soil Microorganisms Major Microbiological Process in Soil by Free Living Microorganisms Which Indirectly Influence Plant Growth

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