ABSTRACT
An experiment was conducted into the Horticulture Farm of Sher-e-Bangla Agricultural University, Dhaka from October 2019 to March 2020 this study the effect of macronutrients combination and plant spacing on growth and yield of black cumin (Nigella sativa L.). Black cumin variety BARI Kalozira-1 was used as planting material in this study. The experiment consisted of two factors: Factor-A: macro nutrient combinations (4 levels): T1= N0P0K0 kg ha-1 (control), T2= N90P50K40 kg ha-1, T3= N135P75K60 kg ha-1; Factor-B: plant spacing (3 levels): S1= 20 cm × 10 cm, S2= 20 cm × 15 cm and S3= 20 cm × 20 cm. The experiment was laid out in a randomized complete block design with factorial with three replications. Data on different growth, yield and yield contributing parameter of black cumin were recorded and significant variation was observed from different treatments. In case of nutrient combinations, the tallest plant (54.86 cm) was observed from T3 (N135P75K60 kg ha-1) treatment. The maximum primary branch plant-1 (8.62) and secondary branch plant-1 (12.18), flower plant-1 (22.20), capsules plant-1 (19.69) and 1000 seed weight (2.99 g) was observed from T2 (N90P50K40 kg ha-1) treatment. The highest seed yield ha-1 (1.18 t) was observed from T2 (N90P50K40 kg ha-1) treatment. In case of plant spacing the tallest plant (48.34 cm) was observed from S1 (20 cm × 10 cm) treatment. The maximum primary branch plant-1 (7.80) and secondary branch plant-1 (11.23) flower plant-1 (20.26), capsules plant-1 (18.81), 1000 seed weight (2.99 g) were observed from S3 (20 cm × 20 cm) treatment. The highest seed yield ha-1 (1.09 t) was recorded from S1 (20 cm × 10 cm) treatment. It can be concluded that, sowing of black cumin providing 90 kg N, 50 kg P and 40 kg K nutrient combination with 20 cm × 10 cm plant spacing was recorded to be more suitable practice for getting higher amount and quality of seed yield of black cumin.