Southcorp has said it will be able to meet its grape requirements, despite fears its own harvest will fall short this year, through the use of other sources.   Although the size of the harvest will be down, Southcorp said, quality is expected to be up. However only 25% of Southcorp's grapes come from its own vineyards. And executive general manager, corporate affairs, Glen Cunningham said yesterday that: "We expect to be fully able to source all our grape requirements for all our brands from this current vintage. So we don't expect there to be any material affect on our capacity to supply."