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-
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.
Author: Jared Chester
Categories: PFR, PFR Reports