Weakness in soymeal, which dropped 1.4 percent on light end user demand and a softening basis on the cash market, also weighed on soybeans.
For the week, the benchmark Chicago Board of Trade May soybean futures contract fell 0.7 percent, breaking a string of three straight positive weeks.
It was the May contract's first close below the 10-day moving average since March 17.
Prices found support near the 38.2 percent point on a Fibonacci retracement from its rally to its year high of $15.12 a bushel.
May soymeal dropped 1.3 percent this week but found support on Friday as it approached its 20-day moving average.
May soyoil rose 1.3 percent for the week, supported by soymeal/soyoil spread unwinding.
Private exporters reported the sale of 330,000 tonnes of soybeans to unknown destinations for the 2014/15 crop year, the US Agriculture Department said.