Accumulation of dry matter in siliqua, number of siliqua per plant, length of siliqua and seeds per siliqua of rapeseed (Brassica campestris L.) plants were studied under three irrigation levels (no irrigation, one irrigation at 30 DAS and two irrigations at 30 and 60 DAS) and three row spacing (20 cm, 30 cm and 40 cm). Th e experiment was carried out at Sher-e-Bangla Agricultural University (SAU) Farm, Dhaka-1207, Bangladesh during the period from October, 2005 to January, 2006. Th e results revealed that the maximum dry matter accumulation in siliquae observed with two irrigations (at 30 DAS and 60 DAS) with 40 cm row spacing. Number of siliquae per plant was aff ected by diff erent irrigation levels and row spacing and the highest number of silique was produced by two irrigations (at 30 DAS and 60 DAS) with 40 cm row spacing. At harvest, two irrigations produced the highest number of siliquae (120.3) which was statistically diff erent from one irrigation (76.14) and no irrigation (control) treatments (30.99) and the diff erences were 288.2% and 145.7%, respectively over control. Length of silique as well as number of seeds per siliqua were signifi cantly aff ected by the combination of irrigation levels and row spacing