The new deadline is July 3.
But farm leaders continue to press the governments to increase support from 70 to 85 per cent of the reference margin.
Supports kick in when profit margins fall below 70 per cent of historical levels calculated for each farm.
AgriStability is much less generous to Canadian farmers than the recently-announced $19 billion package for the United States food industry. It includes $16.5 million in direct payments to farmers.