INFLUENCE OF SEEDLING AGE AND NAA ON GROWTH AND YIELD OF CHINESE CABBAGE

Abstract

An experiment was conducted in the Horticulture farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from October 2019 to January 2020 to study the influence of seedling age and NAA on growth and yield of Chinese cabbage. The experiment consisted of two factors, such as Factor A: Seedling age (3 levels) as- A 1 : 15 days old seedlings, A 2 : 25 days old seedlings, A 3 : 35 days old seedlings and Factor B: Different levels of NAA (4 levels) as N 0 : 0 ppm (control), N 1 : 40 ppm, N 2 : 80 ppm and N 3 : 120 ppm. The two factorial experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Data on different yield components and yield of Chinese cabbage were recorded. Statistically significant variation was recorded from all recorded characters due to the different levels of naphthalene acetic acid (NAA). Seedling age showed significant differences in all recorded characters. Seedling age and different levels of NAA influenced significantly on most of the parameters. Considerable highest values were recorded in head weight (1.69 kg) and gross yield (77.01 t/ha) from 25 days of seedling (A 2 ) and the lowest were recorded from A 3

and A 1 . Considerable highest values were recorded in head weight (1.53 kg) and gross yield (75.72 t/ha) from 80 ppm (N 2 ) followed by 120 ppm (N 3 ) and 40 ppm (N 1 ) of NAA and the lowest value was recorded from control treatments. Interaction effect between different seedling age and NAA also showed significant differences and the considerable yield and yield contributing characters were recorded from the treatment combination A 2 N 3 , while the treatment combination A 3 N 0 gave the lowest value. The highest gross return (Tk. 926,200), net return (Tk. 644,765) and benefit cost ratio (3.29) were obtained from the treatment combination A 2 N 3 and the lowest (Tk. 727,980, 457,139 and 2.69 respectively) were from the treatment combination A 1 N 0 .