In the Rosario grains market, soy closed at between 2,100 and 2,132 pesos per tonne ($318-$323), compared with 2,100 to 2,130 pesos on Friday. Gains in benchmark Chicago futures set the tone for the session, which saw light trading.

Soybean futures on the Chicago Board of Trade rose on Monday on technical buying and strength in soymeal on expectations that bitter cold in the central United States would boost demand for livestock feed.

Rosario soy for delivery in May 2014, which is quoted in US dollars, closed at $288 per tonne versus $286-$290 in the prior session.

In the Argentine port of Quequen, soy closed at 1,900 pesos per tonne. In Bahia Blanca, the oilseed rose 40 pesos to end at 1,970 pesos per tonne.

Argentine corn and soy crops will be stressed by a fresh heat wave in the days ahead until rains hit the Pampas farm belt late in the week, a meteorologist said.