Russia is set to replace its fixed export duty on grain with a floating one, starting at $28.1 per ton, as harvesting of winter wheat begins in the Northern Hemisphere. The move aims to control food price inflation, with the duty's amount determined weekly. However, the impact on export volumes and market prices remains to be seen. Meanwhile, weather conditions are influencing the sowing and harvesting of crops, with an analytical company reducing its wheat crop estimate from last year.