GROWTH AND YIELD OF MUNGBEAN AS INFLUENCED BY SOWING TIME, AUXIN AND GIBBERELLIC ACID

Abstract

The field experiment was conducted at the Research Farm of the Department of Agricultural Botany, Sher-e-Bangla Agricultural University, during the period from February to June 2022 to find the effect of sowing time and the application of auxin and gibberellin on growth and yield of mungbean. The experiment comprised of two factors viz. Factor A: Sowing time (3), i) S₁ = 5 March, ii) S₂ = 15 March and iii) S₃ = 25 March; factor B: Plant growth regulators (4), i) G₀ = Control, ii) G₁ = IAA 30 ppm, iii) G₂ = GA₃ 30 ppm and iv) G₃ = IAA 30 ppm + GA₃ 30 ppm. The results revealed that S₃ treatment (sowing at 25 March) exhibited its superiority to other sowing time of 5 March and 15 March in terms of growth and seed yield of mungbean. Sowing time (25 March) S₃ out-yielded over S₂ by 11.67% higher yield. As S₃ showed the highest number of pods plant⁻ 1 (23.80), the highest number of seeds pod⁻ ii

1 (10.41), highest length of mungbean pod (7.82 cm), the highest weight of 1000-seeds (40.21 g) and the highest seed yield plot⁻ 1 (192.16 g) than other sowing time in this experiment. Significant differences existed among different plant growth regulator treatments with respect to yield and yield contributing parameters of mungbean. A yield advantages of 0.05 t ha⁻ 1 , 0.05 t ha⁻ 1 and 0.07 t ha⁻ 1 was observed from G₃ treatment over G₂, G₁ and G₀ treated plot, respectively. The higher amount of yield from G₃ treatment was possibly aided by the highest number of pods plant⁻ 1 (23.00), the highest number of seeds pod -1 (10.54), highest pod length (7.98 cm), the highest weight of 1000-seeds (44.26 g) and the highest seed yield plot⁻ 1 (183.06 g). Significantly the highest seed yield ha⁻ 1 (0.72 t ha⁻ 1 ) was recorded from S₃G₃ [25 March × (IAA 30 ppm + GA₃ 30 ppm)] interaction due to the the highest number of pods plant⁻ 1 (27.60), the highest number of seeds pod⁻ 1 (12.23), highest pod length (9.13 cm), the highest weight of 1000-seeds (46.54 g), and the highest seed yield plot⁻ 1 (205.84 g). Mungbean seed sown at 25 March and applied with IAA 30 ppm + GA₃ 30 ppm seems promising for producing significantly higher yield of mungbean under the climatic and edaphic conditions of Sher-e-Bangla Agricultural University.