Effects of plant density and cultivars on the green yield and yield components of some stem amaranthus (Amaranthus tricolour L.).
An investigation was carried out to study the effects of plant density on growth and green yield of some amaranth cultivars at the Bangabandhu Sheikh Mujibur Rahman Agricultural Universty, Gazipur during March to August 1999. Three cultivars e.g., Drutaraj, Bashpata and Sureshsari and five spacing levels, 30-10 cm, 30-15 cm, 30-20 cm, 30-25 cm and 30-30 cm were included in this study. Drutaraj produced the highest green yield (12.03, 47.55 and 68.66 t/ha) at all the three stages of harvesting i.e., 30, 37 and 44 days after sowing (DAS). Maximum green yield per plant was produced from widest spacing at all three stages of harvesting. Green yield/ha decreased significantly with increase in plant spacing. The highest green yield (14.11, 52.36 and 84.06 t/ha) was obtained from the closest spacing (30-10 cm) at 30, 37 and 44 DAS, which were about 2 times higher than that of the widest spacing. Highest green yield (16.88, 71.96 and 94.41 t/ha) was produced by Drutaraj at the closest spacing (30-10 cm) in all the stages of harvesting.