Guar seed prices on Friday rose Rs 21 to Rs 5,581 per 10 quintals in futures trade after speculators widened their positions following a firm trend in the spot market.

On the National Commodity and Derivatives Exchange, guar seed contracts for May delivery rose Rs 21 or 0.38 per cent to Rs 5,581 per 10 quintals with an open interest of 53,270 lots.

According to marketmen, speculators raised bets, tracking a firm trend in the spot market and thin supplies from growing belts mainly led to the rise in guar seed prices.