Futures contracts of soybean on the CBOT extended previous session gains and traded 0.5% higher due to low soil moisture and prevailing hot weather in the US. The unfavourable weather may hit the growth and resultant yield of the plant. Around 40% of the soybean crop in the country is in poor condition. The most active August soybean contract traded at $9.9450 a bushel on the CBOT up 0.5% from the previous close.