Trends and growth rate analysis are extensively employed in the agricultural sector as these have significant policy implications. The present study was commenced to design a methodology to fit trends in the three phases of different Gram crops grown in Tamil Nadu state using nonparametric regression. Relative growth rates were calibrated based on non-parametric regression model. On average, the percentage growth rate values obtained in the years 1950-1951 to 2009-2010 for the three phases of different grams crops showed that production increased with a rate of 6.0, which has been at a rate of 2.89 and 3.21 per cent per year due to the combined effect of area and productivity.