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Cuykendall, C.H., White, G.B., Shaffer, B.E., Lakso, A.N. and Dunst, R.M. (1999) Economics of drip irrigation for juice grape vineyards in New York State. Department of Agricultural, Resource and Managerial Economic. College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, 14853-17801.

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• TITLE: Enhancing the crop yield through capacity building programs: Application of double difference method for evaluation of drip capacity building program in Tamil Nadu State, India

  AUTHORS: Kuppannan Palanisami, Coimbatore RamaRao Ranganathan, Devarajulu Sureshkumar, Ravinder Paul Singh Malik

  KEYWORDS: Drip Irrigation; Double Difference Method; Impact Evaluation

  JOURNAL NAME: Agricultural Sciences, Vol.5 No.1, January 10, 2014

  ABSTRACT: A capacity building program on drip irrigation (TNDRIP) was undertaken in certain regions of the Indian State of Tamil Nadu during 2009-2010. An assessment of the impact of the program in terms of effective use of drip irrigation and increased crop yields was made in 2011 by applying double difference method (a combination of both with and without and before and after approaches). The results had indicated that the drip capacity building program resulted in a yield increase of 2.5 t/ha for Banana 1, 1.9 t/ha for Banana 2, 3.3 t/ha for sugarcane and 0.3 t/ha for turmeric. The conventional method using the before and after situations had shown a yield increase of 4.3 t/ha for Banana 1, 12.1 t/ha for Banana 2, 40.6 t/ha for sugarcane and 2.6 t/ha for turmeric. The conventional approach is highly upward biased in estimating the impact of the drip capacity building program and thus the double difference method will be an appropriate method to evaluate the impact of the programs that involve both with and without as well as before and after situations.