Chicago Board of Trade soyabean futures weakened on Monday, pressured by profit-taking after Friday's three-week high and positioning ahead of government crop reports due later this week, traders said. The US Department of Agriculture was due to release quarterly stocks and monthly supply and demand outlooks on Friday.

Rainfall over the week benefited soya fields in about half of Brazil and 30 percent of Argentina, according to the Commodity Weather Group. Drought conditions in Argentina were expected to worsen this week, a meteorologist and farmer said.

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