Tamil Nadu traditionally grows cotton in an area of about 0.2m hectares and produces about 0.6 million bales of cotton and because of its climate and soil, the State is ideally suited for producing long and extra long staple cottons. This analysis was carried out to identify the efficient cropping zones of Cotton crop in Tamil Nadu state. An analytical study was done to identify the Efficient cropping zones of the Cotton crop of Tamil Nadu were keyed out with 10 years data (2004-2015) using Relative Yield Index (RYI) and Relative Spread Index (RSI). We were able to find out the efficient zone for cotton crop. A study was conducted at Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore during 2018-19 to delineate ECZ for the cotton crop of Tamil Nadu. It was found that Salem and Ariyalur both come under more efficient cropping zones for cotton crop. Most of the parts of Tamil Nadu come under NECZ and LECZ. Four districts of Tamil Nadu are coming under efficient cropping zone and they have more area compared to yield. Those districts are Tiruchirapalli, Perambalur, Madurai and Virudhanager.

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