EFFECT OF DIFFERENT PLANTING TIMES AND APPLICATION OF GA 3 ON MOROHO-PHYSIOLOGICAL CHARCTERS AND YIELD OF BROCCOLI (Brassica oleracea var. Italica).

Abstract

An experiment was conducted to study the morpho-physiological characters and yield of broccoli with different planting times and concentrations of GA 3 at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period of October 2016 to May 2017. The experiment was consisted of two factors one is different planting times as- T 1 : 1 November, T 2 : 15 November and T 3 : 30 November; another is levels of gibberellic acid-GA 3 as G 0 : 0 ppm GA 3 ii , G 1 : 25 ppm GA 3 : 50 ppm GA 3 and G 3 : 75 ppm GA 3 . This two factorial experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Different planting times and GA 3 influenced significantly on most of the parameters. The maximum plant height (57.94 cm), number leaves plant (17.80), longest leaf length (24.22 cm), diameter of stem (12.19 cm), curd diameter (41.13 cm), weight of curd (517.6 g) and yield (21.81ton ha -1 -1 ) was found in T 2 (15 November) and 57.25 cm, 17.72, 21.96 cm, 11.89 cm, 39.92 cm, 490.3 g and 21.69 ton ha -1 in G 2 (50 ppm) respectively. Whereas, lowest value of these parameters were found in T 3 (30 November) and G 3 (75 ppm). In case of combined effect the highest value was recorded from T 2 G 2 and lowest recorded in T 3 G 3 . In view of overall performances, this study suggests that the transplanting time T 2 (15 November) and the foliar application of GA 3 , G 2 (Gibberellic acid) at G 2 (50 ppm) independently as well as combinedly gave best performance. From the study it was also discovered that application of more than 50 ppm GA 3 reduced the yield characters and yield of broccoli