The Four Turandot vessel chartered by the United States is scheduled to arrive on Wednesday at the port of Barcarena in the north of Brazil, and is expected to sail on May 9, the Cargonave ship line-up data shows.
Brazil, the world's largest soy producer and exporter, very seldom sells to the United States. China is the main buyer of its soy.
Good soil moisture that is boosting crop prospects in key growing areas pressures wheat futures.
On a continuous basis, the most-active CBOT soft red winter wheat contract hit a three-month low overnight and was on track for a weekly drop of 2.6%, which would be its biggest since early February.
Wheat heads lower on improving crop weather in the US Plains winter wheat belt and a lack of supportive news.
CBOT May soft red winter wheat last traded down 3-3/4 cents at $6.36-1/4 per bushel. K.C. May hard red winter wheat was last down 6 cents at $5.95 a bushel and MGEX May spring wheat was down 2-3/4 cents at $6.30-1/2.
CBOT wheat is supported by a strong soybean market, but pressure continues as weather forecasts for the US Southern Plains show beneficial rains for winter wheat there.
Wet weather continues to hamper Brazilian harvest and second crop corn planting, adding support to CBOT corn amid tight global stocks.