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Nutrient chemistry of groundwater in an intensively irrigated region of southern India

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Environmental Geology

Abstract

The concentration of nutrients in groundwater acts as an indicator to identify the influence of agricultural activities on the shallow subsurface environment. Hence, the present study was carried out to assess nutrient concentration (nitrate, phosphate and potassium) and understand its spatial and seasonal variations in the groundwater of Palar and Cheyyar River basin, Tamil Nadu, India. The groundwater samples collected from 43 wells were analyzed for nutrients once a month from January 1998 to June 1999. Results of the study suggested that agricultural activities, including application of fertilizers, soil mineralization processes and irrigation return flow, are major processes regulating the nutrients chemistry in the groundwater of this region. Groundwater in the sedimentary formation has comparatively higher concentration of nutrients than the groundwater in hard rock formations, which seems to be due to the adsorption of nutrients by the weathered rock materials. The seasonal water level fluctuation shows that rising water level increases nutrients concentration in groundwater due to the agriculture related activities. The results also indicate that nitrate and potassium concentrations are within the recommended drinking water limits, whereas phosphate concentration exceeds its drinking water limit and 35% of the samples are unsuitable for drinking purposes.

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Acknowledgements

The authors wish to acknowledge the research grant provided by the University Grants Commission, New Delhi to carry out this research.

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  1. N. Rajmohan

    Present address: School of Civil and Environmental Engineering, Kunsan National University, Kunsan, Jeonbuk, 573-701, Korea

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  1. Department of Geology, Anna University, Chennai, 600 025, India

    N. Rajmohan & L. Elango

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  2. L. Elango
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Correspondence to L. Elango.

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Rajmohan, N., Elango, L. Nutrient chemistry of groundwater in an intensively irrigated region of southern India. Environ Geol 47, 820–830 (2005). https://doi.org/10.1007/s00254-004-1212-z

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