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Farm Progress Reports

Number

RFR A1543

Farm

Ag Engineering/Agronomy, Central Iowa and BioCentury Research Farms

Department

Agronomy

Fields

Crops and Soils

Abstract

As corn and soybean seed prices continue to rise, and grain prices fall, it is important for farmers to find a population that maximizes both yield and profit. Planting too high of a corn population can result in increased barrenness and thus lower yields, but too low of a population also can result in lower yields. Most past research has shown the optimal planting rate for corn yield falls in a range from about 35,000 to 37,000 seeds/acre. Past studies have indicated soybean yields are similar across a wide range of populations, but too low of a population can result in reduced yields and too high of a planting population can reduce profits. A common recommendation is to plant soybeans at a seeding rate that will achieve a final stand of 100,000 plants/acre or more. The objective of these trials was to evaluate what effect planting population would have on corn and soybean yield.

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