A downforce load sensor for a planter row unit includes a load sensing connector rod coupled with a depth selector of the planter row unit. The load sensing connector rod is disposed to receive a load applied by a stop member supported on the row unit frame, the stop member being in abutment with an abutment member of a gauge wheel arm of a furrow opening assembly of the planter row unit. The load sensing connector rod generating load signals corresponding to a downforce applied to the soil by the gauge wheels of the furrow opening system of the planter row unit.