1.Aeschbach-Hertig, W. and Gleeson, T. 2012. Regional strategies for the accelerating global problem of groundwater depletion. Nature Geoscience, 5(12): 853.

2.Agricultural and Processed Food Products Export Development Authority, 2015. http://apeda.gov.in/ apedawebsite/SubHead_Products/Maize.htm.

3.Aigner, D., Lvell, C. and Schmidt, P. 1977. Formulation and estimation of stochastic frontier production function models. Journal of Econometrics, 6(2): 21-37.

4.Ali, S., Thakur, S.K., Sarkar, A. and Shekhar, S. 2016. Worldwide contamination of water by fluoride. Environmental Chemistry Letters, 14: 291–315.

5.Battese, E. and Coelli, T. The Model for Technical Efficiency effect in a Stochastic Frontier Production Function for pannal data. Empirical Economics, 20: 325-332. 1995.

6.Central Groundwater Board. 2016. “Groundwater Scenario of India”, 2015–16.

7.Coelli, T. 1994. A Guide to Frontier Version 4.1: A Computer Program for Stochastic Frontier Production and Cost Function Estimation. Australia: University of New England.

8.Coelli, T. 1995. Recent Development in Frontier Modeling and efficiency Measurement. Australian Journal of Agricultural Economics, 39(3): 15-26.

9.Dhehibi, B., Aw-Hassan, A., Alimari, A. and Haddad, N. 2014. Technical Efficiency and Its Determinants in Food Crop Production: A Case Study of Farms in West Bank, Palestine, 16: 717-730.

10.FICCI. 2018. http://ficci.in/spdocument/22966/India-Maize- Summit.pdf.

11.Jalali, M. and Ranjbar, F. 2010. Aging effects on phosphorus transformation rate and fractionation in some calcareous soils. Geoderma, 155(1-2): 101-106.

12.Kaur, M., Mahal, A.K., Sekhon, M.K. and Kingra, H.S. 2010. Technical efficiency of wheat production in Punjab: A Regional Analysis. Agricultural economics research review, 23(347-2016-17029), 173.

13.Kouras, A., Katsoyiannis, I. and Voutsa, D. 2007. Distribution of arsenic in groundwater in the area of Chalkidiki, Northern Greece. Journal of Hazardous materials, 147(3): 890-899.

14.Makary, S.R. and Rees, H. 1981. An index of management efficiency for Egyptian agriculture: a case study of large farms. Journal of Agricultural Economics, 32(2): 189-196.

15.Meeusen, W. and van den Broeck, J. 1977. Efficiency estimation from Cobb-Douglas production functions with composed error. International economic Review, 18: 435-444.

16.Mukherjee, I. and Singh, U.K. 2018. Groundwater fluoride contamination, probable release, and containment mechanisms: a review on Indian context. Environmental geochemistry and health, 40(6): 2259-2301.

17.Nasim Ahmad, Sinha, D.K. and Singh, K.M. 2018. Productivity and Resource Use Efficiency in Wheat: A Stochastic Production Frontier Approach, Economic Affairs, 63(3): 611-616.

18.Ozsvath, D.L. 2009. Fluoride and environmental health: A review. Reviews in Environmental Science & Biotechnology, 8: 59–79.

19.Pickering, W.F. 1985. The mobility of soluble fluoride in soils. Environmental Pollution (Series B), 9: 281–308.

20.Ramesh, K. and Soorya, V. 2012. Fluoride contamination in drinking water in palacode region, Tamil Nadu. Int. J. Res. Chem. Environ., 2: 116-123.

21.Shantha, A., Ali, B.G.H. and Bandara, R.A.G. 2012. Efficiency and managerial ability of paddy farming under minor irrigation conditions: a frontior production function approach. Journal of Agricultural Sciences–Sri Lanka, 7(3).

22.Singh, U., Singh, R.B. and Gautam, S.S. 2016. Comparison of Technical Efficiency of Soybean Farmers in Madhya Pradesh. International Journal of Agricultural and Statistical Sciences, 12(1): 223-228.

23.Thomas Felix, K., Murali Gopal, S., Ashok, K.R., Panneerselvam, S. and Duraisamy, M.R. 2018. Technical efficiency of maize production in different vulnerable agro-climatic zones of Tamil Nadu. Journal of Pharmacognosy and Phytochemistry, 7(4): 498-502.

24.Turner, S.W., Hejazi, M., Yonkofski, C., Kim, S.H. and Kyle, P. 2019. Influence of Groundwater Extraction Costs and Resource Depletion Limits on Simulated Global Non renewable Water Withdrawals Over the Twenty‐First Century. Earth’s Future, 7(2): 123-135.

25.World Press. 2017. https://socialissuesindia.wordpress. com/2017/12/27/alarming-fall-in-groundwater-levels-inindia/

26.Yamane, Taro. 1967. Statistics, An Introductory Analysis, 2nd Ed., New York: Harper and Row.