Mato Grosso farmers, who harvested an estimated 32.45 million tonnes of the oilseed in the last crop, had planted 1.7% of the estimated area last week, Imea said.
The historical average of soya planting for the period is 9.17%, according to Imea, which forecasts Mato Grosso farmers will collect a record 32.8 million tonnes of soyabeans this season.
"In general, such planting delays always cause a certain bustle in the market, concerns about what will happen," said Imea analyst Cleiton Gauer. "My technical opinion is that it is possible to compensate for the delay, the percentage is small."
An estimated 50 millimeters (1.97 inches) of accumulated rain is expected through next Friday in the north of Mato Grosso, according to data from Refinitiv, likely helping producers to advance planting in a key region of the state.