In recent years, the proliferation of private well irrigation systems in South Asia, especially in the hard rock areas of India, has stimulated the growth of informal groundwater markets. These markets allow water-buying farmers, who are unable to invest in wells, to benefit from irrigation while enhancing the economic benefits of water-selling farmers. In this way, they have a positive impact on farm income. On the other hand, they are believed to have contributed to the problem of overexploitation of groundwater aquifers. This study examines the role of groundwater markets in determining the efficiency of irrigated farms. Technical, allocative and economic efficiency of groundwater-irrigated farms is determined, using a bootstrapped data envelopment analysis, and the determinants of the efficiency are explored using a bootstrapped truncated regression. For this purpose, data were collected from three different groups of groundwater-irrigated farmers: (i) a control group of 30 farmers who are neither selling nor buying groundwater; (ii) a group of 30 water-selling farmers; and (iii) a group of 30 water-buying farmers. The results demonstrate that there is substantial technical, allocative and economic inefficiency in the irrigated production due to overuse of inputs and that this inefficiency is higher among the control group farmers followed by water sellers and water buyers. Also in the second-stage regression, participation in the water markets is revealed as an important factor positively affecting efficiency scores. This shows that it is relevant for the government to make appropriate institutional policy interventions to capitalize on the benefits associated with the water markets, while at the same time, ensuring that the negative external effects are avoided
This paper has analysed the factors that influence farmers' participation in the informal groundwater market using the Cragg's double hurdle model. For the study, primary data from 171 groundwater farmers belonging to the Eastern Dry Zone of Karnataka were used. The empirical results have shown that agricultural credit and farmers having failed wells positively influence farmers' probability of water buying. With increasing water cost, the farmers are more likely to purchase or sell water and the quantity of water purchased or sold decreases with the increase in irrigation cost. The well-owners who have drip irrigation and land fragments are more likely to sell water. It has been observed that in the study area farmers purchase water at high prices and hence an effective agricultural water pricing is needed. Another option could be to promote joint investment in irrigation which takes care of credit problems and negative externalities of overdraft, resulting in efficient use of resources.
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