EFFECT OF SPACING AND FERTILIZER AMENDMENT ON GROWTH AND SEED YIELD OF ONION

Abstract

A field experiment was conducted in the field of Sher-e - Bangla Agricultural University, Dhaka, Bangladesh during the period from October 2017 to April 2018 . The experiment consisted of four levels of spacing (viz. S 1 = 20cm×15cm, S 2 = 25cm×15cm, S 3 =20cm×20cm, S = 25cm×20cm) and four levels of fertilizer (viz. T 0 = No application (control), T 4 1 = N

kg/ha, T 2 = N 80 P 50 K 100 S 30 kg/ha, and T 3 = N 100 P 70 K 120 S kg/ha). The twofactor

experiment was carried out in Randomized Complete Block Design (RCBD) with three replications. There were 16 treatment combinations in this study. A unit plot was 1.0 m×1.2 m and the treatments were distributed randomly in each block. Data on growth and yield parameters were recorded and analyzed statistically. The differences were evaluated by Duncans Multiple Range Test (DMRT). Growth and yield of onion were influenced by the different spacing and fertilizer amendment. The 25cm×20cm spacing resulted in the highest 40 number of leaves, diameter of bulb, length of bulb, weight of blub per plant and thousand seed weight. The maximum seed yield per hectare (394.9) was observed in 20cm×15cm spacing. NPKS had also significant influence on yield of onion. The highest plant height, number of leaves, diameter of bulb, length of bulb, weight of blub per plant, yield per plot and yield per hectare (1.99 kg/plot and 16.57 t/ha, respectively), number of flowers per umbel, weight of seeds per plant, thousand seed weight were applied N 80 P 50 K 100 S kg/ha. The maximum seed yield per hectare (374.30 kg) was obtained from N 30 80 P 50 K 100 S kg/ha. In respect of combined effect, application of N 80 P 50 K 100 S 30 30 kg/ha with 20cm×15cm produced the highest seed yield per hectare (404.20). Considering above findings, the application of N 80 P 50 K 100 S kg/ha and 20cm×15cm spacing may be used for onion cultivation. 30 60 P 30 K 80 S 20