Australia's agricultural output is expected to reach $100 billion ahead of schedule, but the target's relevance has been questioned against the backdrop of global and domestic challenges.

The target was set in 2020 and the nation has just over four years to hit it, but Agriculture Minister Julie Collins says it is already within reach.

"With Australia exporting now around 80 per cent of our agriculture, fisheries and forestry production to more than 169 markets globally, this is the most diversified our agriculture trade has ever been," Ms Collins told the AgXchange conference on the Gold Coast on Wednesday.

The $100 billion mark was expected to be exceeded in the current financial year, figures from federal agriculture forecaster ABARES show.

But the target measures value and does not

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