Chicago Board of Trade soyabean futures closed lower on Wednesday on uncertainty surrounding US-China trade negotiations, along with seasonal pressure from the expanding Midwest harvest, traders said. CBOT November soyabeans settled down 6 cents at $9.28 per bushel. CBOT December soyameal ended down $3 at $304.80 per short ton while December soyaoil rose 0.01 cent to settle at 30.40 cents per pound. The US Department of Agriculture late on Tuesday said the US soyabean harvest was 26% complete, up from 14% the previous week but lagging the five-year average of 49%.