Nitrogen circulation and nitrate in groundwater in an agricultural catchment in Southern India
- 98 Downloads
High contents of nitrate in groundwater, ranging up to 1,500 mg/l, have been found. High concentrations are more common in village wells than in irrigation wells situated in the fields. The losses of nitrogen from the soil zone through deep leaching into the groundwater are small (260 kg N/km2); however, due to a small net infiltration (29 mm/year), the median content in groundwater still approaches the permissible limit of 50 mg/l NO 3 − . In villages about 10–20% of the nitrogen from excreta are leached into the groundwater. Mineralization of soil nitrogen during a dry period, followed by heavy rains, caused extremely high contents of nitrate in groundwater.
KeywordsNitrogen Nitrate India Heavy Rain Permissible Limit
Unable to display preview. Download preview PDF.
- Baweja, B. K., and K. C. B. Raju, 1981, Ground water in hard rock areas in the Noyil, Amaravati and Ponnani basins, South India,in Larsson, I. (ed.), Ground water in hard rocks: Paris, UNESCO, p. 170–180.Google Scholar
- Dukes, H. H., 1955, The physiology of domestic animals: New York, Comstock Publ. Assoc. 1020 p.Google Scholar
- Eriksson, E., 1976, The distribution of salinity in ground waters in the Dehli region and recharge rates of ground water,in Interpretation of environmental isotope and hydrochemical data: IAEA, Jan. 27–31, 1975.Google Scholar
- Handa, B. K., 1969, Chemical composition of monsoon rains over Calcutta: Tellus, v. 21, p. 95–106.Google Scholar
- Handa, B. K., 1973, Chemical composition of monsoon rainwater over Chandigarh. Indian Geohydrol. v. 9, p. 31–37.Google Scholar
- Indian Institute of Nutrition, 1970, Daily allowances for food intake: Hyderabad, Andhra Pradesh.Google Scholar
- Jacks, G., 1978, Tentative salt balance for a dry densely populated area,in Hydrology in developing countries: Nordic IHP Rep. No. 2, p. 113–125.Google Scholar
- Singh, S. P., and A. K. Sisodia, 1980, Fluid intake, urinary output and chloride excretion in medical students: Ind. J. Med. Sci. v. 34, p. 47–51.Google Scholar
- Sivanappan, R. K., and P. K. Aiyasamy, 1978, Land and water resources of Coimbatore District: Tamil Nadu Agric. Univ., Coimbatore, 62 p.Google Scholar
- Tamhane, R. V., D. P. Motiramani, and Y. P. Bali, 1970, Soils, their chemistry and fertility in tropical Asia: New Dehli, Prentice-Hall of India, 475 p.Google Scholar