INFLUENCE OF DAY LENGTH EXTENSION WITH LED LIGHT SUPPLEMENT ON GROWTH, YIELD AND SEED PRODUCTION OF BROCCOLI (Brassica oleracea var. italica L.)

Abstract

An experiment was accomplished at the Horticulture farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from December 2015 to March 2016 to evaluate the influence of day length extension with supplement LED light on growth, yield and seed production of Broccoli. Five LED light treatments viz. Blue LED Light, L B ; White LED light, L W and Red LED Light, L ; Combined Red and Blue LED light, L R+B ; Control(no artificial light),L C R were used in this experiment. The experiment was laid out in a Randomized Complete Block Design with three replications. The highest plant height(56.7cm),maximum no. of leaves(19.0),length of stem(25.3cm) were found in L B and the L also showed statistically similar results as L B, R+B the minimum plant height(45.1cm), no. of leaves(12.6),length of stem(16.2cm) were found in control. Maximum weight of curd(382.5g), number of pods/plant (106.3),curd yield/ha(7.4t) were found in L R and the L also showed statistically similar results as L R R+B in most of the cases and the minimum results of those parameters were found in L c (control),while the minimum no. of pods (49.6) was found from L

.The highest number of seeds/pod (12.0),seed/plant (1279.0) were found in L and lowest number of seeds/pod (6.0),number of seeds/plant (302.0) were found in L . So, the reproductive growth under L R and vegetative growth under L were found better but L showed the better results in most of the cases throughout the experiment. And the better pod and seed production was found under Red LED light.