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"Excess moisture has made it impossible to sow in large sectors of Chaco, Santiago del Estero and some parts of north-central Santa Fe provinces," the exchange said in a weekly crop report.
It also warned that more weather-related planting area losses may be ahead.
The country's recently collected 2018-19 wheat harvest is estimated at 19 million tonnes versus a previous forecast of 18 million tonnes, the report said.