Soybean Growth and Development & Management Information for Replant Decisions

Determining Yield Loss Due to Replanting

Now we will determine the yield if you were to replant today and compare it to the expected yield of the remaining population. Normal dates of planting for soybean in Minnesota are typically after corn. In recent years, increased yields due to early planting has advanced the recommended planting date for both crops. Data from the Minnesota Agricultural Statistics Service indicate that about 5% of the soybeans are now planted by May 10th, increasing to about 95% planted by June 15th. Nearly half of Minnesota soybean acreage is planted on or before May 20th of each year (Figure 3).

Early planting dates allow use of full season varieties which are usually higher yielding than earlier maturing types. Yield performance and other characteristics of the major public varieties for various planting dates in Minnesota are reported in the current edition of Varietal Trials of Selected Farm Crops(Item number MR-5615), published by the Agricultural Experiment Station of the University of Minnesota.

Table 5shows the approximate percentage yield loss resulting from various planting periods. Note that plantings earlier than May 20 produce the best yields, while later plantings result in large yield decreases. Full season varieties planted before June 10 will mature in southern Minnesota before the fall frost date in early October, but will, of course, have lower yields.

Use Table 5to determine the yield reduction for replanted soybeans and compare it to the yield potential of the remaining population.

Produced by Communication and Educational Technology Services, University of Minnesota Extension.

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