Rice (Oryza sativa L.) is the most crucial cereal food crop of India, which occupies about 24% of gross cropped area of the country. It contributes 42% of total food grain production and 45% of total cereal production of the country.Thus rice production in India as well as in several other Asian countries must be doubled by the year 2025 to meet the requirement of the increasing population. The genetic classification of rice plant belongs to the genus Oryza of family Graminae (Poaceae). The Oryza genus is divided into four species complexes: O. sativa, O. officinalis, O. ridley and O. granulate. Indica are grown throughout the tropical and sub-tropical region, Indica rice are grown in around 90% of world rice area and Japonica varieties are grown throughout the temperate zone and Javanica are grown mainly in the part of Indonesia.Therefore, present study has been conducted to assess the actual spreading of these newer varieties in terms of area with simultaneous reduction in the area under older varieties for rice crop and the increases in the average yield/ha.