ILSOYADVISOR POST

Evaluating Pod Development & Seed Fill

It’s important to always know or have a close idea of where your soybeans are in their growth stage. This information is important not only when making fungicide applications, but also to evaluate the potential risk of threats that could be associated with the current and rest of a growing season. In 2019 several bean fields are slow to advance into the R7-R8 stages, which means there’s a large percentage of yield that is yet to be made and retained.
 
Chart 1: Reproductive growth stages of a soybean plant.
Chart 1 shows the eight growth stages of a soybean plant. The reproductive stages of the soybean plant are focused on producing high pod counts and, more importantly, preserving as many as possible. During this time a soybean plant is trying to balance its hormones and determine what number of pods and seeds it can successfully feed and finish. Stress (disease, nutritional, insect, water and heat) during this time can cause the plant to eliminate pods and seeds.
 
Evaluating Pod Counts - What to Look For:
  1. Remove all the pods from the plant
  2. Separate the pods based off 4, 3, 2, 1, 0 beans per pod
  3. Count how many pods were aborted
  4. Record information to compare field to field and season to season
Pod evaluation from a single plant –
2018 soybean season.
After taking a look at the plant’s pod counts, one can determine the quality of life an individual bean plant has had. This information can provide insight into potential yield, which varieties can withstand stress and how well one’s management practices are working. Yes, it’s always important to see a yield bump from trying a new practice, but it’s even more important to understand how and why, so it can be replicated for years to come.

Todd Steinacher
Steinacher is an ISA CCA Soy Envoy alum and currently supports ISA on agronomic content as well as serving as an Illinois CCA board member. Since 2015, he has been a regional agronomist with AgriGold in West Central Illinois. His previous experience includes 10 years as a sales agronomist in the GROWMARK-FS system. Steinacher has an associate degree from Lincoln Land Community College, a B.S. in agronomy and business from Western Illinois University and a master’s degree in crop science from the University of Illinois at Urbana-Champaign. If you have any questions for him about this article, he can be reached at steinacher@ilsoy.org.


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