EFFECT OF IAA ON BARI MUNGBEAN-6 UNDER WATER LOGGING CONDITION AT POD MATURITY STAGE

Abstract

A pot experiment was conducted at the Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh, during April 2022 to July 2022 to find out the effect of Indole-3-acetic acid (IAA) on mugnbean at pod maturity stage under water logged condition. The experiment comprised of two factors, where factor A refers two level of water logging (W 0 = No excess water stress; W e = Excess water stress at pod maturity stage) and factor B comprised of 5 level of IAA (I 0 = No IAA – only spray water (Control); I 50 = Spray of IAA @ 50 ppm at 15 DAS and 2 days after stress imposition; I 100 = Spray of IAA @ 100 ppm at 15 DAS and 2 days after stress imposition; I 150 = Spray of IAA @ 150 ppm at 15 DAS and 2 days after stress imposition and I 200 = Spray of IAA @ 200 ppm at 15 DAS and 2 days after stress imposition). There were 10 treatment combinations and experiment was setup in Completely Randomized Design (CRD) with four replications. The study revealed that waterlogging showed remarkable decrease of plant height in all growth stage, branch number plant -1 , above ground fresh weight plant -1 , above ground dry weight plant -1 , pod length, number of pods plant -1 , SPAD value, relative water content, 1000 seeds weight and yield plant -1 . Application IAA @ 200 ppm produced the tallest plant at harvest (50.60 cm); earliest maturity (56.63 days); maximum above ground fresh weight and dry weight of plant -1 (10.52 g and 8.63 g, respectively), maximum pod number per plant (13.88); highest SPAD and RWC value (50.43 and 72.07, respectively), 1000 seeds weight (39.17 g) and yield plant -1 (12.92 g). In combined effect, the application of IAA @ 200 ppm significantly increases plant height, branch number, early flowering and maturity, increase pod number, pod length, SPAD value, RWC value, 1000 seeds weight and yield per plant in both no and excess water stress conditions. So, water logged mungbean plant at maturity stage may be given IAA @ 200 ppm for minimize the detrimental effect of excess water stress for optimum crop production.