RESPONSE OF POTASSIUM AND BORON ON THE GROWTH AND YIELD OF ONION (BARI Peyaj-4)

Abstract

The experiment was conducted at the Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh from January to April

2022 to determine the effects of potassium (K) and boron (B) on the growth and yield of onion (BARI Peyaj-4). In this experiment, onion (BARI Peyaj-4) was selected as the test crop. The experiment consisted of two variables. Factor A: Potassium doses (4 levels); 0 kg potassium ha -1 1 , 90 kg potassium ha -1 and 120 kg potassium ha -1 , 60 kg potassium ha and factor B (3 levels): 0 kg boron ha , 1.0 kg boron ha -1 , and 2 kg boron ha -1 .The experiment consisted of three replications with an RCBD design. K & B combination, B 2 ×K 3 (2 kg boron ha ) showed the highest plant height (61.09 cm) whereas B 0 -1 ×K 0 and 120 kg potassium ha (0 kg boron ha and 0 kg potassium ha -1 ) showed the lowest plant height (30.30 cm), The taller plants at the highest doses received more nutrients which might have encouraged more vegetative growth. B 2 ×K 3 (2 kg boron ha -1 and 120 kg potassium ha -1 ) showed the highest number of leaves of Onion (7.67) whereas B 0 ×K 0 (0 kg boron ha -1 and 0 kg potassium ha ) showed the lowest no. of leaves (4.49), B 2 ×K 3 (2 kg boron ha -1 -1 -1 and 120 kg potassium ha ) showed the highest plant height (57.82 cm) and B 2 ×K 0 (2 kg boron ha and 0 kg potassium ha -1 ) showed the lowest leaf length (25.52 cm). B 2 ×K 3 (2 kg ha and 120 kg ha -1 ) showed the highest fresh weight of leaves (55.42 cm) whereas B 0 ×K 0 and 0 kg ha -1 ) showed the lowest fresh weight of leaves (36.69 cm). B 2 ×K 3 -1 -1 (0 kg ha (2 kg ha and 120 kg ha -1 ) showed the highest Diameter of the bulb (5.25 cm) whereas B 0 ×K 1 and 60 kg ha -1 ) showed the lowest Diameter of the bulb (3.75 cm), The most oversized diameter of a bulb of the plant at the highest doses received more nutrients which might have encouraged more vegetative growth. B 2 ×K 3 (2 kg ha -1 and 120 kg ha ) showed the highest length of the bulb (5.75 cm) whereas B 0 ×K 0 (0 kg ha -1 and 0 kg ha ) showed the lowest length of the bulb (3.74 cm). The interaction effect of different doses of potassium and boron showed B 2 ×K 3 (2 kg ha -1 and 120 kg ha -1 ) showed the highest yield (22.41 t ha -1 ) whereas B 0 ×K 0 (0 kg ha -1 and 0 kg ha -1 -1 (0 kg ha -1 -1 ) showed the lowest yield (13.19 t ha ) which is statistically similar to the treatment combination of B 1 ×K 0 (1.0kg ha and 0 kg ha -1 ) . The maximum yield gained at the highest doses received more nutrients which might have encouraged more vegetative growth and yield. The B 2 ×K 2 -1 (2 kg B ha and 120 kg K ha -1 ) treatment combination showed a better response in most studied parameters.