Potato futures for June fell by Rs 8.10, or 0.79% to Rs 1,011.50 per quintal in 38 lots.
At the Multi Commodity Exchange (MCX), the May contract declined by Rs 5.40, or 0.53% to Rs 1,004.50 per quintal in 39 lots.
Prices fell as speculators engaged in trimming their positions driven by fall in spot market demands against adequate stocks position.
Increased arrivals from producing regions strengthened the availability of stocks.