EFFECT OF POTASSIUM ON THE YIELD OF ONION

Abstract

A field experiment was conducted at the Farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during Rabi season from November 2019 to March, 2020 to evaluate the effect of different levels of potassium on growth and yield of onion (BARI piaj-4). The experiment was laid out in a RCBD with three replications. Eight different levels of potassium were used as treatments viz. 0, 18, 36, 54, 72, 90, 108, and 126 kg ha -1 . Results revealed that application of potassium had a significant effect on growth parameters specifically Plant height (cm), Number of leaves per plant, Length of leaves (cm), Fresh weight of leaves (g), Fresh weight of bulb (g), Diameter of bulb (cm), Dry weight of bulb (g), Length of bulb (cm) and Yield (t ha ). The highest bulb yield (19.83 t ha -1 ) and maximum bulb diameter (5.05cm), weight of onion bulb(65.67g) were obtained with 90 kg K ha -1 .The lowest bulb yield (13.07 t ha -1 ) was recorded in the plot that received no potassium fertilizer. On overall considerations, 90 kg K ha -1 was considered as optimum dose for the yield of onion under the experimental conditions. -1