EFFECT OF FOLIAR APPLICATION OF IAA AND GA 3 ON GROWTH AND YIELD OF MUNGBEAN PLANT

Abstract

A field experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Dhaka, during March to June, 2020 to study the Effect of Foliar Application of IAA and GA 3 on Growth and Yield of Mungbean Plant (BARI Mung-6). The experiment was consisted of two types of plant growth regulators, viz. i) Auxin (IAA- Indole acidic acid) and ii) Gibberellic acid (GA 3 ). Nine levels of foliar spray with IAA and GA 3 application viz. i) Control (T 0 ), ii) Spraying IAA @ 25 mg/L at 30 DAS (T 1 ), iii) Spraying IAA @ 50 mg/L at 30 DAS (T 2 ii ), iv) Spraying GA 3 @ 25 mg/L at 30 DAS (T 3 ), v) Spraying GA 3 @ 50 mg/L at 30 DAS (T 4 ), vi) Spraying IAA @ 25 mg/L + GA 3

@ 25 mg/L at 30 DAS (T 5 ), vii) Spraying IAA @ 25 mg/L + GA 3 @ 50 mg/L at 30 DAS (T 6 ), viii) Spraying IAA @ 50 mg/L + GA 3 @ 25 mg/L at 30 DAS (T 7 ) and ix) Spraying IAA @ 50 mg/L + GA 3 @ 50 mg/L at 30 DAS (T 8 ). The experiment was laid out in randomized complete block design (RCBD) with three replications. The data regarding on plant height, number of leaves, number of branches were recorded both 30 days after sowing (DAS) and at harvest. The other parameters were recorded meanwhile cultivation and at the time of harvest. Results revealed that in case of morphological parameters, plant height (57.50 cm), number of leaves (17.33) plant

and number of brunch (7.67) plant -1 were significantly higher in T 8 (IAA @ 50 mg/L + GA 3 @ 50 mg/L) treatment. In terms of growth characters; SPAD value (55%), days to flowering (27.33) and days to maturity (55.33) were also significantly higher in T 8

(IAA @ 50 mg/L + GA 3 @ 50 mg/L) treatment. The data regarding yield and yield attributes, number of pods plant -1 (37.66), pod length (14.99), number of seeds pod (13.78), weight of 1000- seeds (54.95g), seed yield (1.62 t ha -1 ), stover yield (1.78 t/ha), biological yield (3.74t/ha), and harvest index (37.75 %) were higher in T 8 (IAA @ 50 mg/L + GA 3 @ 50 mg/L) treatment. However, (T 0 ) untreated control (IAA 0.0 mg/L, GA 3 0.0 mg/L) showed the lowest performance in every stages. The result indicated that the plants treated with T 8 (IAA @ 50 mg/L + GA 3 @ 50 mg/L), performed better in respect of growth, yield and others yield contributing characters.