In the main grains market of Rosario, soy closed up at between 1,610 pesos and 1,660 pesos ($313/$324) per tonne compared with Friday's 1,600 pesos, boosted by brisk demand from local buyers despite losses by US soy futures, traders said.

Trade volume was a light 7,000 tonnes.

Soybean futures on the Chicago Board of Trade fell for a second straight session on position-squaring ahead of US government reports this week on old-crop stocks and 2013 US plantings, traders said.

Rosario soy for delivery in May, which is quoted in US dollars, closed down $5 at $320 per tonne.

In the southern grains port of Bahia Blanca, the oilseed traded unchanged at 1,650 pesos per tonne.

<Center><b><i>Copyright Reuters, 2013</b></i><br></center>