Abstract:
An experiment was conducted in Horticultural farm of Sher-e-Bangla
Agricultural University, Dhaka to find out the effect of nitrogen and plant
growth regulator on the growth and yield of red amaranth (Amaranthus
tricolor L) during the period from November to December 2006. Four levels
of nitrogen viz. N0: 0 kg/ha, N
69 kg/ha, N2: 92 kg/ha, N3: 115 kg/ha and
different concentration of Indole-3-Acetic Acid (IAA) viz. 10: 0 ppm IAA, I
1:
150 ppm IAA, Ii: 200 ppm IAA, 13: 250 ppm IAA were used for this
experiment. Plant height, stem diameter, leaf area, growth rate of stem
diameter, growth rate of height, growth rate of weight and yield were
increased as the levels of nitrogen were increased. Incase of different
concentrations of lndole-3-Acetic Acid, plant height, stem diameter, leaf
area, growth rate of stem diameter, growth rate of height, growth rate of
weight and yield were increased up to Ii level then the parameter mentioned
above was decreased. The maximum plant height ( 46.33 cm), stem diameter
(12.33 mm), growth rate of height (l.286 cm/day), growth rate of stem
diameter (0.342 mm/day), growth rate of weight (0.716 g/day), leaf area
(56.l l crn/) and yield (19.50 t/ha) were measured from N3Ii treatment at
harvest. The maximum benefit cost ratio (BCR = 2.5) was recorded from
N312 treatment and the minimum ( 1.86) was found from N010 treatment.
