To observe the growth and yield attributes of cauliflower under different spacing and nitrogen fertilizers, a field experiment was conducted with cauliflower (Brassica oleracea var. botrytis L.) variety “BARI Phulcopi-1 (Rupa)”. The experiment was carried out at the research field of the Department of Crop Science and Technology, Rajshahi University, Rajshahi during the period from November, 2021 to February, 2022. The experiment consisted of three spacing i.e. 60cm X 50cm, 60cm X 60cm and 60cm X 70cm  as well as three levels of nitrogen fertilizers viz. 80kg/ha, 100kg/ha and 120 kg/ha. The results revealed that different treatments significantly affected the growth and yield attributes of cauliflower. The combination of 60cm X 70cm spacing with highest level of nitrogen fertilizer (120 kg/ha) produced the maximum plant height, leaf length, leaf breadth, curd diameter, curd height, curd weight/plant and yield whereas 60cm X 60cm and highest level of nitrogen fertilizer produced the highest no. of leaves/plant and days to curd initiation. On the other hand, all the studied parameters except days to curd initiation found to be lowest in the treatment combination of 60cm X 50cm spacing with lower level of nitrogen fertilizer (80 kg/ha).The study concluded that cauliflower need to be cultivated at 60cm X 70cm spacing and 120 kg/ha nitrogen fertilizer is to be applied for getting the targeted yield as well as desired return from cauliflower cultivation in “High Ganges River Floodplain zones” of Bangladesh.

Key words: Spacing, nitrogen fertilizer, growth and yield, cauliflower