Soybean seeding rate recommendations
Emerson Nafziger and Dennis Bowman at the University of Illinois have incorporated the formula into an excellent online Soybean Seeding Rate Calculator. Neither the online calculator nor the formula presented above adjust planting rates for the type of planting equipment used (planters versus drills and air seeders). To account for the variability in the seed metering, planting depth, and seed-to-soil contact associated with drills and air seeders, decrease the emergence estimate to 80 percent when using the formula listed above or the Illinois seeding rate calculator. The percent emergence should also be decreased by an additional 10 percent when planting early or when planting into untilled or poor soil conditions. Consider increasing the emergence estimate by 5 percent when using fungicide and insecticide seed treatments.
Comparing soybean seeding rates, harvest populations and yields in each of your fields every year will help determine the optimum planting populations for your fields over the long run.
This article was produced by the SMaRT project (Soybean Management and Research Technology). The SMaRT project was developed to help Michigan producers increase soybean yields and farm profitability. The SMaRT project is a partnership between Michigan State University Extension and the Michigan Soybean Checkoff program.
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