EFFECT OF GIBBERELLIC ACID AND SPACING ON GROWTH AND YIELD OF LETTUCE (Lactuca sativa L.)

Abstract

In the present study the effect of both Gibberellic Acid (GA ) and plant spacing on growth and yield of lettuce was examined at Horticulture Farm, Sher-e-Bangla Agricultural University, Dhaka during the period from October 2013 to January 2014. During cultivation, three levels of Gibberellic Acid (GA 3 ), (G 0 = 0 mg/L, G 1 3 =25 mg/L and G =50 mg/L) and four levels of plant spacing’s as S 1 = 15x20 cm, S 2 =20x25 cm, S 3 =25x25 cm, S 2 =25x30 cm were evaluated in Randomized Complete Block Design with three replications. In case of different factors the maximum gross fresh yield (29.05 t/ha) was recorded from G , whereas the minimum gross fresh yield (16.27 t/ha) was recorded from G 0 4 1 . The spacing of S recorded the maximum gross fresh yield (23.8 t/ha) due to highest fresh weight of plants, while the minimum gross fresh yield (14.82 t/ha) was obtained from the widest spacing’s S due to lowest number of plants at 45 DAS. In case of combined effect the highest gross fresh yield (27.73 t/ha) was obtained from G 1 S where as the lowest gross fresh yield (16.27 t/ha) was recorded from G 0 S 4 3 . Cost benefit analysis indicate that the highest benefit ratio (2.04) was obtained from G 1 S 3 , where as the lowest benefit ratio (1.16) was obtained from G . On the basis of overall effect and economic analysis it can be concluded that GA concentration (25 mg/L) and plant spacing (25x25 cm) on growth and yield proved to be the most promising 3 for getting optimum yield in lettuce and it is apparent that it was suitable for lettuce

0 3 S 4 1