EFFECT OF NITROGEN AND SULPHUR ON THE GROWTH AND YIELD OF BARI ONION- 4

Abstract

A field experiment was conducted at the research farm of Sher-e-Bangla Agricultural University, Dhaka, during November 2020 to February 2021 to study the effects of nitrogen and sulphur on growth and yield of onion (BARI Piaz-4). The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications of each treatment. The unit plot size was 3 m 2 (2.5 m x 1.2 m). There were 12 treatments combinations in the experiment comprising 4 levels of N (0, 70, 110 & 140 kg/ha showed as N 0 ii , N 70 , N 110 & N 140 , respectively) and 3 levels of S (0, 15 & 30 kg/ha designated as S 0 , S 15 & S 30 , respectively). The collected data on different parameters were statistically analyzed by MSTAT C Package and the mean comparison was made by DMRT (Duncun’s Multiple Range Test) at 5% and 1 % level. In general the other parameters like number of leaves per plant, leaf length, fresh weight of leaves plant-1. fresh weight of' bulb plant-1. dry weight of leaves / plant, dry weight of bulb per plant, bulb diameter, length of' bulb and yield increased with increasing the N doses upto 140 kg N/ha (N 140 ). The maximum number of leaves per plant (8.39cm) whereas leaf length (23.01cm), fresh weight of leaves plant -1 (8.69cm) fresh weight of' bulb plant -1 (24.36cm), dry weight of leaves plant

(0.79cm), dry weight of bulb per plant (4.68), bulb diameter (5.58cm) and length of' bulb (3.44cm) were recorded from N 140 treatment. Minimum values of these parameters were obtained from N 0 (control). However, the highest bulb yield (6.34 t/ha) was recorded from N 140 and the lowest bulb yield (3.86 t/ha) was recorded from control condition. The highest moisture content in both leaf and bulb (92.00% and 89.20 %) and were recorded from N 140 treatment while the lowest moisture content in leaf and bulb (85.10% and 85.36 %) was recorded from N0 (control) treatment. The maximum number of leaves per plant (7.20cm) whereas leaf length (24.25cm), fresh weight of leaves plant (7.21cm) fresh weight of' bulb plant -1 (26.30cm), dry weight of leaves plant -1 (0.77cm), dry weight of bulb per plant (3.44cm), bulb diameter (4.89cm) and length of' bulb (3.65cm) were recorded from S 30

treatment. Minimum values of these parameters were obtained from S 0 (control). However, the highest bulb yield (4.98 t/ha) was recorded from S 30 and the lowest bulb yield (4.12 t/ha) was recorded from control condition. The highest moisture content in both leaf and bulb (93.00% and 89.10 %) and were recorded from S 0 treatment while the lowest moisture content in leaf and bulb (86.20% and 86.73 %) was recorded from S 30 treatment. The soil properties such as soil pH and organic matter content were increased after the harvest of crop compared the nutrient status of the initial soil.