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Agronomic Crops Network

Ohio State University Extension


Recommendations for Late Planted Soybeans

Persistent wet weather prevented soybean planting in many areas of the state. Late planting reduces the cultural practice options for row spacing, seeding rate, and relative maturity.

Row spacing. The row spacing for June planting should be no greater than 7.5-inch if possible. Row width should be narrow enough for the soybean canopy to completely cover the interrow space by the time the soybeans begin to flower. The later in the growing season soybeans are planted, the greater the yield increase due to narrow rows.

Seeding rate. Higher seeding rates are recommended for June plantings. Data from previously conducted seeding rate trials, suggest seeding rates between 200,000-225,000 seeds/acre when planting the first half of June.

Relative maturity. For June planting dates, plant the latest maturing variety that will reach physiological maturity before the first killing frost. This is to allow the plants to grow vegetatively as long as possible to produce nodes where pods can form before vegetative growth is slowed due to flowering and pod formation. The recommended relative maturity ranges are shown in the table below.


Planting Date

Suitable Relative Maturity

Northern Ohio

June 1-15



June 15-30



July 1-10


Central Ohio

June 1-15



June 15-30



July 1-10


Southern Ohio

June 1-15



June 15-30



July 1-10


Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.