C.O.R.N. Newsletter

  1. Wet spring corn planting
    Author(s): Allen Geyer , Author(s): Peter Thomison

    The Corn Growing Degree Day decision support tool allows one to choose any Corn Belt county, enter the planting date and hybrid maturity, and generate a graph that shows projected GDD accumulations through the season, including the date on which you can expect that hybrid, planted on that date in that county, to mature (achieve black layer). One important adjustment missing from this tool is the fact that planting corn late usually lowers the GDD needed to get a hybrid from planting to maturity.

    Issue: 2019:16
  2. Author(s): Peter Thomison

    Corn GDD Tool to Identify "Safe" Hybrid Maturities for Late Planting.  Dr. Bob Nielsen at Purdue University has written an article describing a powerful decision aid, U2U Corn GDD Tool, which can be used to identify "safe" hybrid maturities for late planting. The GDD Tool is currently available for Ohio and it can estimate county-level GDD accumulations and corn development dates based on current and historical GDD data plus user-selected start dates, relative hybrid maturity ratings, GDDs to black layer, and freeze temperature threshold values.

    Issue: 2019-15
  3. Author(s): K. Nemergut , Author(s): Alexander Lindsey , Author(s): Peter Thomison

    Planting depth recommendations for Ohio are 1.5 to 2 inches deep to ensure adequate moisture uptake and seed-soil contact. Deeper planting may be recommended as the season progresses and soils become warmer and drier, however planting shallower than 1.5 inches is generally not recommended at any planting date or in any soil type. According to some field agronomists, shallow plantings increase stress and result in less developed roots, smaller stalk diameters, smaller ears and reduced yields.

    Issue: 2019-12
  4. Author(s): Peter Thomison , Author(s): Steve Culman

    As prospects for a timely start to spring planting diminish, growers need to reassess their planting strategies and consider adjustments. Since delayed planting reduces the yield potential of corn, the foremost attention should be given to management practices that will expedite crop establishment. The following are some suggestions and guidelines to consider in dealing with a late planting season.

    Issue: 2019-10
  5. Author(s): Alexander Lindsey , Author(s): Peter Thomison

    Third Author:  Emerson Nafziger

    Issue: 2019-09
  6. Author(s): Steve Culman , Author(s): Peter Thomison

    As prospects for a timely start to spring planting diminish, growers need to reassess their planting strategies and consider adjustments. Since delayed planting reduces the yield potential of corn, the foremost attention should be given to management practices that will expedite crop establishment. The following are some suggestions and guidelines to consider in dealing with a late planting season.

    Issue: 2018-10
  7. Corn Harvest
    Author(s): Peter Thomison

    Hybrid selection is one of the most important management decisions a corn grower makes each year. It’s a decision that warrants a careful comparison of performance data. It should not be made in haste or based on limited data. Planting a marginal hybrid, or one not suitable for a particular production environment, imposes a ceiling on the yield potential of a field before it has been planted.

    Issue: 2017-40
  8. Author(s): Peter Thomison

    During the past two weeks, corn has “exploded” in growth in many Ohio fields. Under favorable growing conditions corn plants can grow nearly three inches per day between V8 (i.e., the eight leaf collar stage) and V15. However, there is considerable variability in corn development across the state, between neighboring fields, and within fields. Most of this variation can be attributed to planting date differences. Corn planted in mid to late April is at or beyond V13 whereas corn planted in early to mid-June is usually at stages no later than V3-4.

    Issue: 2017-19
  9. Author(s): John Fulton

    2017 has been a “wet” spring for planting which also can cause compaction issues; side-wall and pinch-row compaction. Compaction of any kind can lead to emergence issues and possible yield loss. Identifying compaction is the first step in understanding the consequences during the growing season and at harvest while also beginning to consider options for mitigating if long-term consequences appear to be in place.

    Issue: 2017-16
  10. Author(s): Peter Thomison

    According to the USDA/NASS (https://www.nass.usda.gov/Statistics_by_State/Ohio/Publications/Crop_Progress_&_Condition/2017/cw2117oh.pdf), for the week ending May 21, corn was 73 percent planted, which was 24 percent ahead of last year and the same as the five-year average. 

    Issue: 2017-14

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