Argentine soya's closing prices and trends on Friday. In the main grains port of Rosario, soya closed between 900 and 905 pesos ($294/$296), little changed from Thursday's close of 908.5 pesos. There was virtually no trade, falling from 20,000 tonnes in the previous session largely because the influential CBOT soya futures market was closed on Friday for the July 4th holiday in the United States.