The research work was conducted in the research field of the Department of Agronomy, at Sher–e– Bangla Agricultural University; Dhaka during the period kharif–II from September 2012 to December 2012. The experimental site is located at 23.410 N and 90.220 E latitude and at an altitude of 8.6 m from the sea level. The area is situated in the sub-tropical climatic zone and characterized by heavy rainfall from April to August and scanty rainfall during the rest period of the year. Low temperature observed in October to March and plenty of sunshine from November to February. Soil type was shallow red brown terrace. Prior to setting the experiment and after harvest soil samples were collected from the experimental site and analyzed their physical and chemical properties using atomic absorption and spectrophotometric methods for Zn and B, respectively. The test variety was BARI Mash- 3. The experiment was laid out at Randomized Complete-Block Design (RCBD) with three replications of 20 treatment combinations comprising four levels of Zinc 0, 1.25, 2.5, 3.75 kg ha–1and five levels of Boron 0, 0.5, 1.0, 1.5. 2.0 kg ha–1along with recommended fertilizer N20 P25 K35kg ha–1as per soil test based (BARC, 2005). Zinc and Boron levels were assign to main and sub-plot, respectively. The size of unit plot was 2.5 m × 2.0 m where, block to block and plot to plot distance was 0.50 m and 0.50 m, respectively. Row to row and plant to plant distances were also 0.30 m and 0.10 m, respectively, in each plot. The treatment combinations were as follows: T1=Zn0B0, T2=Zn0B0.5, T3=Zn0B1.0, T4=Zn0B1.5, T5=Zn0B2.0, T6=Zn1.25B0, T7=Zn1.25B0.5, T8=Zn1.25B1.0, T9=Zn1.25B1.5, T10=Zn1.25B2.0, T11=Zn2.5B0, T12=Zn2.5B0.5, T13=Zn2.5B1.0, T14=Zn2.5B1.5, T15=Zn2.5B2.0, T16=Zn3.75B0, T17=Zn3.75B0.5, T18=Zn3.75B1.0, T19=Zn3.75B1.5, T20=Zn3.75B2.0. NPK fertilizers were applied during final land preparation. Zinc and Boron were applied as zinc sulphet and boric acid, respectively as per treatment during final land preparation. Intercultural operations such as thinning, weeding, gap filling and plant protection measures were done as needed. Five Plants sample were randomly collected from the middle portion (1m2) of each plot beginning from 20 days after sowing (DAS) at 15 days interval up to harvest. The leaf area of each sample was measured by LICOR automatic leaf area meter (LICOR– 2000, UK) before drying and then converted into LAI. The total dry matter production was determined at oven at 70? C for 72 hours (Asaduzzaman et al., 2010). On the basis of leaf area index and dry mater accumulation rate, the growth parameters i.e. Crop Growth Rate {CGR = 1/ GA× W2- W1/ T2-T1 g m–2day–1 Where, W1= Total dry matter production at previous sampling date, W2= Total dry matter production at current sampling date, T1= Date of previous sampling ,T2= Date of current sampling, GA= Ground area (m2)}, Relative Growth Rate (RGR= Loge W2- Loge W1/ T2-T1 g g–1day–1) were calculated according to the equation of Gardner et al. (1985). Statistical analysis was done by MSTAT–C computer program with Randomized Complete Block Design (Russel, 1986).