EFFECT OF SOWING DATE AND SEEDING RATE ON YIELD AND YIELD COMPONENTS OF IRRIGATED CANOLA (BRASSICA NAPUS L.) GROWN ON A RED-BROWN EARTH IN SOUTH-EASTERN AUSTRALIA

摘要: Response of canola (Brassica napus) to factorial combinations five sowing dates and seeding rates was investigated from 1987 1989. The experiments were conducted on red-brown earths in the Goulburn-Murray Irrigation Region south-eastern Australia. Crops sown at monthly intervals beginning April each year. In 1987, 4.6, 7.0 14 kg ha-1, but 1988 1989 lowest rate eliminated. cultivar Marnoo used year Eureka included There no difference between yields seed oil for crops May, declined when date delayed beyond May. Oil contents greater than 45% April, May June sowings contrast, had effect oil. produced a maximum yield 398 g m-2 minimum 172 September 1988. 1989, out-yielded all August sowing. 483 its 315 number pods per m2 major factor responsible significant changes experiments. Seed also strongly correlated (P < 0.01) with biomass, lesser degree, individual weight comparisons exception