PERFORMANCE OF RAPESEED (Brassica campestris) LINE SAU-C-F7 TO DIFFERENT ROW SPACING AND IRRIGATION LEVEL

Abstract

An experiment was conducted at the Agronomic field of Shcr-e-Bangla Agricultural University, Dhaka-1207 on silly clay loam soil during the period from October, 2004 to January, 2005 to find out the optimum row spacing and irrigation level for the rapeseed line SAU-C-F7. The experiment was carried out with three row spacings (20 cm, 30 cm and 40 cm) and 3 levels of irrigation (no irrigation. one irrigation at 30 DAS and two irrigations at 30 and 60 DAS). The experiment was laid OUI in split-plot design with four replications. Row spacing and irrigation level significantly influenced the growth, development and yield of the rapeseed line.

Among the row spacings. the widest spacing (40 cm) influenced plant to have maximum above ground fresh weight, dry matter and its partition, umber of siliquae, number of seeds siliqua-1, number of seeds, number of branches, 1000-seed weight, seed yield and also seed yield ha-1. But. the maximum plant height and number of plant m-2 was round with closer row spacing (20 cm). Maximum seed yield plant-1at 40 cm row spacing of was 29.34% and 1.3% higher than 20 cm row spacing (St) and 30 cm row spacing (S2),respectively.

Two irrigation - one at 30 DAS (pre-flowering stage) and another at 60 DAS (siliquae developmental stage) increased economic yield with higher values of harvest index as the yield attributes like branches plant-1, siliquae plant-1, seeds siliqua-1. Seeds plant-1, 1000-seed weight. The number of plants m-2 was found similar under different irrigation level. The increased seed yield plant-1 with two irrigations was 364.6 % and 84.2 % higher than no irrigation and one irrigation is respectively.

In most of the cases the wider row spacing coupled with two irrigations were found to be influenced for better growth and yield of plant. The highest seed yield per plant was found with the interaction of two irrigations and 40 cm row spacing. This was achieved due to maximum number of branches plant-1, number or siliquae plant-1 and 1000-seed weight. The yield attributes were supported with appreciable production of dry matter and its partition towards different parts.

Number of branches plant--1, number of siliquae plant-1, number of seeds siliqua-1, number of seed plant-1, 1000•seed weight had a significant correlation with seed yield plant-1 with the r values of 0.95**, 0.97**, 0.67*, 0.96** and 0.94**. They were also positively correlated with each other.