Sugar futures for April declined by Rs 17, or 0.54%, to trade at Rs 3,119 per quintal in 19,700 lots.At the National Commodity and Derivatives Exchange (NCDEX), the March contract shed Rs 14, or 0.45%, to Rs 3,073 per quintal in 24,710 lots.Weak spot demand and rising higher supplies affected the trade.Prices weakened as speculators engaged in reducing positions.