Abstract
The surface of the earth is about 508 x 106 km2, of which 71 percent is marine waters and about 5 percent is freshwater lakes and rivers. Much of the freshwater area is found in the temperate and cold regions where it is covered with ice in winter. This limits the growing season for the freshwater plants severely. The freshwater macrophytes are most noticeable when they clog inland waterways. The periodic removal of this biomass has in recent years been connected to its possible use by conversion to biogas. Conversion studies are in progress with reference to its local importance as a renewable source of energy, especially in developing countries (Choudhury et al. 1982).
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Indergaard, M. (1983). The Aquatic Resource. In: Côté, W.A. (eds) Biomass Utilization. NATO Advanced Science Institutes Series, vol 67. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0833-2_8
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DOI: https://doi.org/10.1007/978-1-4757-0833-2_8
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