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Agronomic Crops Network

Ohio State University Extension

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C.O.R.N. Newsletter

  1. Soybean Progress and Pod Set Growth Stages

    Author(s): Laura Lindsey

    Currently, most soybean fields in Ohio are at the R3 growth stage, meaning there is a pod at least 3/16 inch long (but less than 3/4 inch long) at one of the four uppermost nodes on the main stem with a fully developed leaf. Some late planted fields may still be at the flowering growth stage while some early planted fields may be entering the R4 growth stage (pod 3/4 inch long at one of the four uppermost nodes on the main stem with a fully developed leaf).

    Issue: 2022-23

  2. Soybean Progress and Flowering Growth Stage

    Author(s): Laura Lindsey

    Currently, most soybean fields in Ohio are at the flowering growth stage (R1-R2). (Some late-planted or re-planted soybean may still be at a vegetative stage.) Even as soybean plants begin to flower, they may only have 3-5 trifoliolates due to late planting and wet weather followed by dry conditions. However, even if plants have flowers and only a few trifoliolates, the plant will continue to add leaf area up to the R5 growth stage, which comes 4-6 weeks later.

    Issue: 2022-21

  3. Recommendations for Soybeans Planted in June

    Author(s): Laura Lindsey

    According to the USDA National Agricultural Statistics Service, 36% of soybean acreage in Ohio was planted by May 22. As soybean planting continues into June, consider row spacing, seeding rate, and relative maturity adjustments.

    Issue: 2022-16

  4. Soybean Planting Progress and Vegetative Growth

    Author(s): Laura Lindsey

    Cool, wet weather in April and early May delayed soybean planting progress; however, with some warmer and drier days, soybean planting was 18% complete by the second week of May (Table 1). Soybeans that were planted the end of April or first week of May are likely at the VC growth stage or will be at the VC growth stage soon (Figure 1).

    Table 1. Percent soybean acres planted in Ohio by week for the past five years (USDA NASS).

    Issue: 2022-15

  5. Western ARS Agronomy Field Day, Wednesday July 17, 2019

    The Western Agricultural Research Station Agronomy Field Day will be held July 17th. The station is mostly planted but everything went in on the edge – as you saw it on your farm too. Hear our researchers thoughts and recommendations on how to manage this interesting season.

    A couple of items we will walk through are:

    Issue: 2019:20
  6. R3 Stage Soybean

    What is the R3 Growth Stage?

    Author(s): Laura Lindsey

    A few weeks ago, Dr. Anne Dorrance wrote an article about foliar fungicide application to soybean for control of frogeye leaf spot disease. She recommended spraying at the R3 growth stage. (Her entire article is here: https://agcrops.osu.edu/newsletter/corn-newsletter/2018-19/we-have-found-some-whiskers-spores-cercospora-sojina).

     

    What is the R3 growth stage? And has it already passed?

     

    Issue: 2018-23

  7. Diagnosing Soybean Seedling Issues in 2018

    Author(s): Anne Dorrance , Author(s): Kelley Tilmon , Author(s): Laura Lindsey , Author(s): Mark Loux

    It seemed to take forever this spring, but hopefully all of your soybeans are planted – for the first and only time.  Ohio’s biggest challenge is replanting; it is costly (new seed, cost of planting, lower yields due to delay in planting).  The first step is assessing overall stand health – do you have enough plants to obtain the best yields?  Based on a substantial amount of data, for soybeans planted in May, a harvest population of at least 100,000 plants/acre is generally adequate to maximize yield.

    Issue: 2018-17

  8. Estimating Soybean Yield

    Author(s): Laura Lindsey

    To estimate soybean yield, four yield components need to be considered: plants per acre, pods per plant, seeds per pod, and seeds per pound (seed size).  A printable worksheet to estimate soybean yield can be found by clicking here. 

    Issue: 2017-29

  9. It’s Beginning to Look a Lot Like – Off-Target Dicamba Movement – our Favorite Time of the Year!

    Author(s): Mark Loux , Author(s): Bill Johnson

           You would probably have to be living under a rock to not at this time be aware of the issues with off target dicamba movement affecting soybeans and other plants in the states of Tennessee, Arkansas, and Missouri.  The latter two states just banned any additional dicamba applications for the remainder of the growing season to avoid additional problems (subject to change probably), and some changes are coming in Tennessee also apparently.  We have seen firstha

    Issue: 2017-21
  10. brown, diseased emerging soybean plant. PPO and cold injury

    Soybean seedling issues – a perfect storm

    Author(s): Anne Dorrance , Author(s): Mark Loux

    Several calls last week with pictures of injured and/or diseased soybean seedlings.  For most of these situations we have the following scenario:  PPO herbicides (flumioxazin, sulfentrazone, saflufenacil) included as a component of the preplant burn down, fields planted 7 days later with fungicide treated seed, followed by 1 to 2 weeks of suboptimum growing conditions (between 40 to 50oF) for 2 weeks, and greater than 2” rain.  These conditions are very conducive to both Pythium damping-off and PPO injury. 

    Issue: 2017-13

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