The grain and straw yields were significantly higher under the treatment 15 × 15 cm. This might be due to cumulative influence of higher plant population, higher temperature in the canopy, more leaf area index, more of light interception and higher number of effective tillers m-2 resulting in yield enhancement at 15 × 15 cm spacing maximum grain yield registered under closer spacing was opined by Rajarathinam and Balasubramaniyan (1999) and Singh et al. (2003).