RESPONSE OF MUNGBEAN (Vigna radiata L.) TO PLANT GROWTH REGULATORS

Abstract

A field experiment was conducted at the research farm of Sher-e-Bangla Agricultural University, Dhaka-1207, from March 2017 to May 2017. This study was conducted with the objectives to study the response of plant growth regulators on flowering behavior, growth, and yield of Mungbean (Vigna radiata L.) viz BARI Mungbean-6. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications of each treatment. The unit plot size was 4 m x 3 m. There were one factors in the experiment comprising nine levels of Gibberellic Acid (GA ), Indole Acetic Acid and Naphthalene acetic acid (Control, 50ppm IAA, 50ppm GA 3 3 , 50ppm NAA, 100ppm IAA, 100ppm GA , 100ppm NAA, 50ppm IAA+ 50ppm GA 3 + 50ppm NAA and 100ppm IAA+100ppm GA 3 3 + 100ppm NAA designated as T , T 4 ,T 5, T 6, T 7 and T 8 ). The effect of different doses of foliar spraying (IAA, GA and NAA) and their combined effect showed significant variations in flowering behavior, growth and yield of mungbean. The highest plant height (22 cm at 20DAS, 37.6cm at 40DAS and 48.9 cm at 60DAS), number of leaves per plant, number of branches per plant, inflorescences per plant (10.33), flower per inflorescence (10.77), flowers per plant (43.67), pod per inflorescence (11), pods per plant (24), 1000 seed weight (60 gm), pod length (8.467cm), average dry weight per plant (8.467gm), yield per plant (9.067 gm), yield per plot (1003 gm), yield per hectare (2050 kg) and minimum days required for first flowering (30.67 DAS) were found in T treatment. In case of control minimum plant height, number of leaves per plant, number of branches per plant, inflorescences per plant (2.667), flower per inflorescence (2.33), flower per plant (17), pods per inflorescence (3), pods per plant (9), 100gm seed weight (50g), pod length (7.1 cm), average dry weight per plant (7.5g), yield per plant (6.333 gm), yield per plot (820 g), yield per hectre (700Kg) and maximum days required for first flowering were found. All these parameters were found to be increased with increasing concentration of growth regulators. It was observed that in case BARI Mungbean-6, 100 ppm NAA, IAA, GA concentration there were inferior results than 50 ppm concentration of IAA, GA 3 and NAA.