Since your planter was probably made by cutting down a larger planter (lucritive business these days), it probably lacks row markers. I dont use row markers myself, but can get fairly even spacing by planting perpendicular to the direction I cultipacked at. This makes nice marks in the soil that are very easy to follow. Just line up your front tire to marks from the prior pass such that rows end up equally spaced. With a 2-row planter, you will need a 2-row or 1-row cultivator. If necessary, you can adjust your planter row spacing and/or your tractor tire width setting to provide proper clearance for cultivating. A CUT will not be a great cultivating tractor because they generally lack ground clearance. An old 1-row, row-cropper like a Farmall cub or super-A are by far the best machines to use for cultivating small corn acreages.