Response Of Mungbean to Gibberellic Acid (GA₃) And Nitrogen Application with Reference to Yield and Protein Content

الملخص

An experiment was carried out in the field of Sher-e-Bangla Agricultural University, Dhaka to study the impact of GA₃ and nitrogen on growth, yield attributes and protein content of mungbean. The experiment was conducted using as treatments three levels of GA₃ (0, 50 and 100 ppm) combined with four nitrogen doses (0, 22, 44 and 66 kg ha⁻¹ of urea), distributed in RCBD with three replications. Yield and quality parameters were largely affected by GA₃ treatment. 50 ppm GA₃ application generated maximum number of pods per plant (107.52), seeds pod⁻¹ (9.97), chlorophyll content (52.75%), seed yield (2.16 t ha⁻¹), stover yield (1.05 t ha⁻¹), nitrogen content (4.11%) and protein content (25.72%) while minimum values were recorded in control treatment. Nitrogen was also effective in enhancing plant growth and yield. Plots receiving 44 kg urea ha⁻¹ gave significantly the maximum pods per plant (108.94), seeds per pod (10.14), 1000- seed weight (47.22 g), seed yield (2.16 t ha⁻¹) and stover yield (1.08 t ha⁻¹) while minimum value was recorded in control plots followed by all other treatments for these attributes in between the range of highest and lowest values respectively of these characters among the treatment combinations applied under study.. The application of 50 ppm GA₃ in combination with 44 kg urea ha⁻¹ (G₁N₂) showed the best effect (i.e., significantly superior), which produced the maximum number of pods per plant (132.27), seed per pod (11.30), thousand-seed weight (47.92 g), seed yield (2.38 t ha⁻¹), stover yield (1..28 t ha⁻¹) and both nitrogen content of seeds (4.20%) and protein content (26..25%). Hence it is recommended that 50 ppm GA₃ along with 44 kg urea ha⁻¹ is the most effective treatment for obtaining higher mungbean yield and protein content.