Correlation studies among different growth parameters and seed yield of gobhi sarson (Brassica napus L.) sown in different row rectangularities in uni- and bi-directions

摘要

A field trial was conducted during the rabi seasons of 1988-89 and 1989-90 on a loamy sand irrigated soil with gobhi sarson (Brassica napus) cv. GSLI to study the effect of sowing patterns on relationships among different growth parameters and seedyield. Results indicated positive correlations of leaf area index (0.847 to 0.907), chlorophyll content (0.837 to 0.950) and dry matter production (0.654 to 0.981) with seed yield. All other yield components, such as number of branches, number of siliquae per plant, siliqua length, seed yield, harvest index (HI), LAI, chlorophyll content, DM, photosynthetically active radiation (PAR) interception and seed yield were positively correlated among themselves. However, plant height was negatively correlatedwith LAI, chlorophyll content, dry matter, yield components and seed yield, thus dwarf plants in any geometric pattern whether with unidirectional or bidirectional sowing gave higher yields. Chlorophyll content was positively correlated with seed yield,LAI and PAR interception. The cumulative positive effect of dwarf plants, higher LAI and high chlorophyll content contributed to significant increases of 4.2 and 5.0% in seed yield with bidirectional sowing (2.19 and 1.95 t/ha) compared with east-west sowing (2.11 and 1.86 t/ha) in 1988-89 and 1989-90, respectively. Corresponding increases with bidirectional sowing compared with north-south sowing (2.15 and 1.90 t/ha) were 2.3 and 2.5%. It is suggested that bidirectional sowing (with equidistant spacingof plants) may increase yields without adding to the cost of production.