The wheat export tax will be set at $28.1 per tonne starting from June 2 to June 8, the ministry said. Export taxes for barley and maize are at $39.6 and $52.2 per tonne, respectively.
Rice output in the world's biggest exporter and the second largest producer is estimated at a record 121.46 million tonnes compared to a forecast of 120.32 million tonnes in February.
The farm ministry pegged peanut production to be at 10.12 million tonnes in 2020/21, lower than its earlier estimate of 10.15 million tonnes.
The volume sold, at an average price of 2,363 yuan ($360.36) per tonne, rose slightly from around 1 million tonnes sold last week.
Chinese feed makers have been scooping up wheat from reserves to substitute for more expensive corn. But demand for the grain has cooled down a little as corn prices fell.
Wheat futures lower on improved US winter wheat condition ratings and ideas that Russia might relax grain export controls.
Weekly winter wheat condition ratings improved in the last week in Kansas and Oklahoma while holding steady in Texas, the US Department of Agriculture said Monday.