Futures contracts of most constituents in the edible oil basket, barring soybean and mustard, declined on domestic commodity exchanges. Shrugging off the previous session weakness, contracts of soybean on NCDEX closed 0.8% higher due to improved demand at lower prices in spot markets. Lower arrivals in key markets also boosted the prices. Arrivals were low as farmers are busy in sowing. Futures contracts of mustard on the NCDEX settled 0.5% higher bolstered by improved purchases in wholesale markets.