Adjusting soybean planting date is one of the most important and least expensive cultural practices you can do to increase yield. If growing conditions are favorable, planting early offers an opportunity to capture the maximum yield potential of a soybean variety.
Early-planted soybeans use a larger portion of the summer’s total sun and heat, and provides an opportunity to plant a longer-season variety.
However, planting soybean early is recommended only when seedbed conditions are good. Planting in wet soils just to plant early – causing soil compaction and poor seed placement – will outweigh any benefit of early planting.
Genetic Gain × Management Interactions in Soybean: I. Planting Date - Crop Science, 2013
Three Reasons Why Soybean Planting Date Matters - University of Nebraska
New information regarding soybean planting depth. A new study on soybean planting depth may have producers reconsidering shallow planting depths. Michigan State University Extension News. April 2014
What data layers are important for variable rate soybean seeding prescriptions? - University of Wisconsin, 2015
Soybean Yield Partitioning Changes Revealed by Genetic Gain
and Seeding Rate Interactions - Crop Ecology and Physiology, 2014
Nearly every year some soybean are replanted, due to saturated soils, ponding, hail, frost or disease. For a step-by-step process to use while making soybean replanting decisions, read Early Season Soybean Replant Decisions, Integrated Crop Management News, Iowa State University, May 2014.
Think Twice Before Planting Soybeans - University of Wisconsin