To find the planted population per acre, all you need to know is the row spacing (36 inches) and the seed spacing (6 inches). To find the planted population, start with one acre (43,560 square feet), divide by the row spacing (3 feet), then divide again by the seed spacing (0.5 feet) to get 29,040 seeds per acre. Make sure the inch measurements get converted to feet (inches divided by 12) before doing this calculation.
Formula:{One acre (sq. ft.) / row spacing (ft.)} / seed spacing (ft.) = seeds per acre