Growth and Yield of Lettuce (Lactuca Sativa L.) Influenced As Nitrogen Fertilizer and Plant Spacing

: The experiment was conducted in the Research Field of Sher-e-Bangla Agricultural University, Dhaka from October 2014 to February 2015.The present study was conducted to determine the optimum level of nitrogen fertilizer and proper plant spacing for better growth and yield of lettuce. The experiment consisted of two factors. Factor A: Nitrogen (4 levels) N 0 : 0 (Control); N 1 : 50; N 2 : 100 and N 3 : 150 kg/ha respectively; and Factor B: Plant spacing (3 levels), S 1 : 40 cm × 20 cm, S 2 : 40 cm × 25 cm; S 3 : 40 cm × 30 cm. The Experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. In case of nitrogen the highest yield (29.99 t/ha) was recorded from N 3 and lowest (18.65 t/ha) from N 0 . In case of spacing the highest yield (25.83 t/ha) was achieved from S 2 and lowest (23.0 t/ha) from S 1 . For interaction effect, the highest yield (31.31 t/ha) was obtained from N 3 S 2 and lowest (16.79 t/ha) from N 0 S 1 . The highest BCR value (3.88) was recorded from N 3 S 2 and lowest (2.1) from N 0 S 1 . So, 150 kg/ha urea with spacing of 40 cm × 25 cm were best for growth and yield of lettuce.