There is no need to adjust the seeding rate for soil type or planting date. The relationship between the number of seeds planted and the eventual plant population depends primarily on seed quality and expected emergence of live seed. Previous experience indicates that, with his soil type and equipment, he can expect to lose about 10 percent of the seedlings from crusting problems, leaving a 90 percent live seed emergence. Thus, our farmer would set his planter to drop about 74 seeds per 10 feet of row. Information about seed drop, soybean plates, and sprocket settings is given in the owner's manual for planting equipment.
Some manuals use pounds per acre when referring to seeding rates.
Therefore, to select desired settings corresponding to seeds per foot, it is necessary to convert to an acre basis. Regardless of the planter used, seed drop should be field-verified regularly. The most difficult figure to accurately determine when using the above seeding rate formula is percent expected emergence. Average Number of Seeds per Pound for Various Public Soybean Varieties Maturity group Variety Ave. The main ones are soil conditions, weather, date of planting, cultural practices including planting depth, and seed treatment.