Chicago Board of Trade soyabeans fell on Friday on heavy speculative sales, nearly ideal US crop weather and a slight cutback in domestic crush, brokers said.
"It's a case of irrational exuberance to the downside," said Vic Lespinasse, AG Edwards floor trader.
"There are no early rumours behind the losses. Funds and locals began selling and we hit (sell) stops."
"From what I hear off the floor, the lion's share of the selling seems to be investment fund liquidation," agreed Dale Gustafson, analyst at Citigroup.
CBOT soyabeans were last down 4 to 47 cents per bushel, with May down 37 cents at $9.76 and July down 45 cents at $9.37-1/2 per bushel after falling the daily 50-cent daily trading limit.
July fell through technical support at Thursday's low of $9.62 a bushel after resistance held at Thursday's high of $9.85.
CBOT soyaoil was last down 0.75 cent to up 0.35 cent, with July down 0.75 cent at 30.36 cents.
CBOT soyameal was last down $1.50 to $14.00, with July down $14.00 at $302.00 per ton. Cash US soyameal basis offers were steady on Friday.
The losses followed Wednesday's sharp break when CBOT May soybeans ended down 62 cents and July closed down the daily trading limit.