An agricultural row unit for use with a towing frame hitched to a tractor includes an attachment frame adapted to be rigidly connected to the towing frame, and a furrow-opening module comprising a first linkage pivotably coupled to the attachment frame, a first movable frame pivotably coupled to the linkage to permit vertical pivoting movement of the first movable frame relative to the linkage, a furrow-opening device mounted on the first movable frame, and a first biasing element pivotably attached to the linkage and coupled to the first movable frame for urging the furrow-opening device downwardly against the soil. The row unit also includes a furrow-closing module and a second biasing element for urging the at least one furrow-closing device downwardly against the soil.
