Agronomy Talk


Published on Tuesday, December 8, 2020

What do you do with a poor stand? How good of a stand is good enough? Beck’s Practical Farm Research (PFR)® implemented new studies in 2020 to help farmers manage a reduced stand of soybeans and have confidence in making decisions- including when to replant.

Soybeans - Replant Threshold

The first study developed was the Replant Threshold study. This study was designed to determine the threshold of how low a stand can go and still be profitable. We structured this study to target sporadic stands of 40k, 60k, 80k, and 100k seeds/A. using planter plates with randomly plugged cells. Then we compared those reduced stands to a normally spaced treatment of 150k seeds/A. that was planted three weeks later.

In our multi-location Replant Threshold – 15 In. Row study results, we discovered sporadic stands above 70k seeds/A. were higher yielding than full stands of 150k seeds/A. planted three weeks later. Our in-season scouting highlighted that soybeans’ ability to branch out allows them to compensate for reduced stands and still achieve optimal yields. The early-planted entries with reduced stands had 5-7 more nodes/plant at R4 compared to the later planted 150k seeds/A. treatment.


Soybeans - Spotting-In

The Soybean Spotting-In study was also new for 2020. This trial was implemented to uncover the benefit of spotting in or replanting a thin stand of soybeans. We started by planting a sporadic 60k stand to represent a possible replant scenario. Then an additional 60k, 80k, and 100k seeds/A. were planted at a slight angle three weeks following the initial planting date. We also evaluated tearing up the initial stand and replanting 150k seed/A. three weeks later. The data showed that when faced with a reduced sporadic stand under 70k seeds/A. it pays to spot-in more soybeans.




Soybean Replant Takeaways-

  1. Planting soybeans EARLY PAYS, even when it results in a reduced stand as low as 70K seeds/A.
  2. If emerged populations are below 70K seeds/A., it pays to spot-in more soybeans.
  3. If replanting is necessary, it is better to add to the existing stand instead of tearing it up and replanting.
  4. Weed control must be included when making replant decisions. One of the greatest weed suppression tools we have is canopy closure from our crop.

We will conduct these studies again in 2021 to generate multi-year data to further assist you in making these in-season management decisions with confidence.

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Author: Jared Chester

Categories: PFR, PFR Reports


Jared Chester

Jared Chester

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