Siddi Raju,S; Kesava Raju,K; Srinivasulu,S (1999): Hydrochemistry of Groundwaters in the Pulang river basin, Andhra Pradesh. Indian Journal of Environmental Protection, 19(4): 245-249.
In the present paper an attempt is made to bring out t the relationship between the quality of groundwater and lithological characteristics of different rocks present in the Pulang river basinf Cuddapah district. Andhra Pradesh. Ninety two groundwater samples ‘are collected from the Pulang river basin area and 19 chemical constituents are analysed. The geochemical characteristics of groundwater samples are correlated with ‘geological, pedological- and topographical conditions which has a direct bearing upon the accumulation of salts in the study area. Water samples have been classified for their suitability to different types of crops, that are grown in the basin area.
Singh,NK; Kumar,B; Singh,SK (1999): Physico- chemical characteristics of water in the upper strethches of Damodar River. Indian Journal of Environmental Protection, 19(1): 48-51.
Darnodar river water was analysed at different locations from Petratu to Rajrappa. River water upstream of Nelkari confluence is clean when compared with IS 2496, Class "C" (Inland Surface Water Norms, 1982). But after joining Nalkarl and running further through the urban - indu- -strlel areas, the river water quality gradually deteriorates.
Smith,VH; Tilman,GD; Nekola, JC (1999): Eutrophication: impacts of excess nutrient input on freshwater, marine, and terrestrial ecosystem. Environmental Pollution, 100: 179-196.
In the mid-1800s, the agricultural chemist Justus von Liebig demonstrated strong positive relationships between soil nutrient supplies and the growth yields of terrestrial plants, and it has since been found that freshwater and marine plants are equally responsive to nutrient inputs. Anthropogenic inputs of nutrients to the Earth’s surface and atmosphere have increased greatly during the past two centuries. This nutrient enrichment, or eutrophication, can lead to highly undesirable changes in ecosystem structure and function, however. In this paper we briefly review the process, the impacts, and the potential management of cultural eutrophication in freshwater, marine, and terrestrial ecosystems. We present two brief case studies (one freshwater and one marine) demonstrating that nutrient loading restriction is the essential cornerstone of aquatic eutrophication control. In addition, we pre-sent results of a preliminary statistical analysis that is consistent with the hypothesis that anthropogenic emissions of oxidized nitrogen could be influencing atmospheric levels of carbon dioxide via nitrogen stimulation of global primary production.